4.10's or 4.56's ?

[DCRANER]

Sorry, probably been answered thousands of times, but...............

I have a 97 TJ 4.0 5-Speed with the stock 3.07 gears, Dana 30 & Dana 35 (open rear), and 33" tires. Yes, a stupid combination.

No offroading, very little highway, mostly around town, my dog's gums flapping in the breeze, etc.

So, to get it in the "sweet spot" would 4.10's do it or would 4.56's make more sense? Not worried about gas mileage, just want a nice running Jeep.

Also have K&N drop in, Firepower ignition, Banks Monster exhaust, and thinking of a Hypertech programmer.

What total parts would be needed? Should I do a locker type rear?, don't want to get stuck in the snow.

[OhioYJ]

On my YJ 4.10s were about perfect with my 33s I thought. However they aren't enough with larger tires, if you think you might go larger in the furture, you might want to go 4.56 the first time around.

A locker in the rear of that Dana 35 wouldn't be a good idea, I've seen open diffed 35s on 33s break on the street. The front would handle the locker better than the rear.

[DCRANER]

Originally posted by OhioYJ:
On my YJ 4.10s were about perfect with my 33s I thought. However they aren't enough with larger tires, if you think you might go larger in the furture, you might want to go 4.56 the first time around.

A locker in the rear of that Dana 35 wouldn't be a good idea, I've seen open diffed 35s on 33s break on the street. The front would handle the locker better than the rear. Thanks. I am new to Jeeps, mostly old car stuff, so I am used to having a GM type Posi rear for the snow. I just thought why go thru all of this gear, etc. cost and have a Jeep with an open front & rear, only one tire at each end grabing, or am I wrong.

[mrbeerbaitnammo]

i went with 4.56 for my yj to run 35's and am in the middle of install of the gears....what a damn headache, but look around for a chart i think there is one on the Quadratec web site for tire sizes to gear ratio, but when i was looking for gears earlier i would agree with Ohio 4.10 should be fine

[OhioYJ]

why go thru all of this gear....only one tire at each end grabingNo you are right, however, if you are just doing a instertable locker you can do it later no problems. A full case locker should be done at the same time you do the gears. The problem is the Dana 35 has enough trouble staying together with open diffs, a locker adds stress to it. You may get away with running a locker in the rear, some are lucky, others aren't it didn't take me long to destroy my 35 running 33s and a locker. Running on the street you'd probably get away with it, don't get to crazy with the clutch though.

[DCRANER]

Originally posted by OhioYJ:
</font><blockquote>quote:</font><hr />why go thru all of this gear....only one tire at each end grabingNo you are right, however, if you are just doing a instertable locker you can do it later no problems. A full case locker should be done at the same time you do the gears. The problem is the Dana 35 has enough trouble staying together with open diffs, a locker adds stress to it. You may get away with running a locker in the rear, some are lucky, others aren't it didn't take me long to destroy my 35 running 33s and a locker. Running on the street you'd probably get away with it, don't get to crazy with the clutch though. </font>[/QUOTE]Thanks again. Maybe a better question is, what if my Jeep had been ordered in 97 from the factory with the up graded Dana or the 3.73's with 31's, would it then have had some type of locker (posi) type rear and / or front? Or is the open rear & front good enough for a major snow storm?

I just imagine 2 feet of snow and my TJ with 33's spinning tires & going no place while some Soccer Mom in an AWD mini-van goes by me laughing.

[OhioYJ]

A locker and a posi are two entirely different things. From the factory you could have gotten a trac-loc in the rear (posi unit).

Adding a locker in the rear would help quite a bit in deep snow. However, also keep in mind you will be going sideways a lot in light snow, its mangeable, but you have to be aware of it.

Your going to need new carriers anyways so you'll have to decide whether you want lockers (then a full case or insertable), a posi, or just open diffs.

[DCRANER]

Originally posted by OhioYJ:
A locker and a posi are two entirely different things. From the factory you could have gotten a trac-loc in the rear (posi unit).

Adding a locker in the rear would help quite a bit in deep snow. However, also keep in mind you will be going sideways a lot in light snow, its mangeable, but you have to be aware of it.

Your going to need new carriers anyways so you'll have to decide whether you want lockers (then a full case or insertable), a posi, or just open diffs. O/K, how about a Detroit Trutrac Dana 35 (limited slip) combined with 4.10's front & rear, new carriers, and Overhaul kits. That would be a good street combination; performance, reliability, and good snow (rear) traction?

I appreciate your help, just trying to do the right thing.

[OhioYJ]

A truetrac is a good street differential, but I really would find it hard to dump that kind of money into a Dana35, however, since you only drive on the street you breakage worries are minimized. On nice level ground, even a posi can work pretty good, and I've seen new posis for $100, however a posi will wear out, which would be an advantage for the truetrac. Of course then too, a open carrier w/ an aussie locker would be cheaper than a true trac and offer more traction yet.

I guess its hard to give advice, as I do things with the intent of making the Jeep perform better off-road, then worry about making it fairly streetable.

[DCRANER]

Originally posted by OhioYJ:
A truetrac is a good street differential, but I really would find it hard to dump that kind of money into a Dana35, however, since you only drive on the street you breakage worries are minimized. On nice level ground, even a posi can work pretty good, and I've seen new posis for $100, however a posi will wear out, which would be an advantage for the truetrac. Of course then too, a open carrier w/ an aussie locker would be cheaper than a true trac and offer more traction yet.

I guess its hard to give advice, as I do things with the intent of making the Jeep perform better off-road, then worry about making it fairly streetable. Well, I think the Truetrac probably makes sense for me. I like that there are no clutches, etc. to get "funky", so no need to worry about fluids with FM's and so forth.

Think going from 3.07 to 4.10 will be a major change in driveability, 4.56 probably is not needed.

Is Quadratech's Superior Gear sets really good quality? I plan on ring / pinion,carriers, overhaul kits, front & rear, and a Truetrac Dana 35 for the rear. Running RedLine Syn. fluids now, is that still a good choice, or does the breakin need a regular type fluid?

[OhioYJ]

Yes superior makes really good drivetrain products, so those gears are fine. Seems like I remember the truetrac being a little high price wise than it is now.

You probably already know, but since you have a carriers in your list, you'll only need the front carrier, since you are going with a truetrac in the rear.

As for fluids, the bearings and gears will wear really really quick for a split second to break in, so you will probably want to change the fluid after the gears have been driven on some. I'd probably put cheap fluid in it first, just because that Redline stuff is pretty exspensive just to drain right back out.

[DCRANER]

Originally posted by OhioYJ:
Yes superior makes really good drivetrain products, so those gears are fine. Seems like I remember the truetrac being a little high price wise than it is now.

You probably already know, but since you have a carriers in your list, you'll only need the front carrier, since you are going with a truetrac in the rear.

As for fluids, the bearings and gears will wear really really quick for a split second to break in, so you will probably want to change the fluid after the gears have been driven on some. I'd probably put cheap fluid in it first, just because that Redline stuff is pretty exspensive just to drain right back out. Since I am going from 3.07 to 4.10 don't I still need new carriers front & rear?

[OhioYJ]

You need the 3.73-up carrier for the front, in the rear the TrueTrac is the carrier.

You only need the carrier, you should be able to re-use your current spiders and such, from what I can find on Quadratec it seems that the Dana30 carrier is $200? That sounds more like the assembled carrier price, and not just the carrier, I'd call and find out.

Also just as another option, check around, you can pick up 4.10 gear sets off lots people that have done gear changes, 4.10s came in many of the 4-cylinder Jeeps. I ended up getting my set of 4.10s and carriers here from another board memeber for $125. Checking ebay might not hurt either, 4.10 Gears/Carrier Dana 30 (http://cgi.ebay.com/ebaymotors/jeep-tj-dana-30-4-10-gears-wth-open-carrier_W0QQcmdZViewItemQQcategoryZ33731QQitemZ802 7257584QQrdZ1QQsspagenameZWDVW)

Also just in case, if you look at used stuff, your TJ should have a high pinion Dana 30, which means you need reverse cut gears, so gears out of a low pinion Dana 30 won't work.

[fyrfyter4393]

Originally posted by OhioYJ:
Also just in case, if you look at used stuff, your TJ should have a high pinion Dana 30, which means you need reverse cut gears, so gears out of a low pinion Dana 30 won't work. TJs have low pinion 30's.

[StrongWind]

I've had the Trutrac in the rear of my YJ running 4:10s/33's/auto for a few years now with no problems. Yes, I take it off road and run it pretty hard with no problems (yet) - I carry spare shafts for the D35.

Works great IMO - I think everyone gets too wound up in having the biggest/baddest setup that they usually don't need....every situation is different. If you don't act like an idiot, you probably won't destroy your stuff in "normal" use...

I'll bet you'll be more than happy with the trutrac and 4:10's....

[DCRANER]

Originally posted by StrongWind:
I've had the Trutrac in the rear of my YJ running 4:10s/33's/auto for a few years now with no problems. Yes, I take it off road and run it pretty hard with no problems (yet) - I carry spare shafts for the D35.

Works great IMO - I think everyone gets too wound up in having the biggest/baddest setup that they usually don't need....every situation is different. If you don't act like an idiot, you probably won't destroy your stuff in "normal" use...

I'll bet you'll be more than happy with the trutrac and 4:10's.... Thanks. I have gotten used to my 3.07's on 33's (4.0 w/5-speed), so I might be somewhat of an idiot, so I am looking forward to the 4.10's. And the Truetrac in the rear should be just the right thing for the snow.

Once I have the gears I am considering a 180 thermostat with the Hypertech programmer, combined with my current K&N, Banks Monster, and Fire Power ignition it should be a really nice runner.

[OhioYJ]

TJs have low pinion 30's.They do??

[fyrfyter4393]

Originally posted by OhioYJ:
</font><blockquote>quote:</font><hr />TJs have low pinion 30's.They do?? </font>[/QUOTE]Yeah, that's why alot of guys swap in a HP 30 from an XJ. In fact, I'm keeping half an eye open for one at the right price.

[omaha2020]

actually if he as the 5 speed and and is running 33's he would need 4.56 to be at his stock ratio, if he has the auto then he could use 4.10's.
then if he wants to go with 35's 4.88's will put him at stock with his 5 speed.

[Knuckelhead]

Originally posted by OhioYJ:your TJ should have a high pinion Dana 30 [/QB]If that was the case I wouldn't have been busting my knuckles the last 2 months converting a 94 Cherokee high pinion axle (non-disconnect) to WJ knuckles for my TJ...

[DCRANER]

Originally posted by omaha2020:
actually if he as the 5 speed and and is running 33's he would need 4.56 to be at his stock ratio, if he has the auto then he could use 4.10's.
then if he wants to go with 35's 4.88's will put him at stock with his 5 speed. I did some checking and I thought 4.10's on 33's was about in line with a stocker with 3.73's on 30"s.

[fyrfyter4393]

Keep in mind that 33s are alot heavier than 30s.

[OhioYJ]

Yeah, that's why alot of guys swap in a HP 30 from an XJ. I stand corrected, don't know why I thought that. Glad someone caught that.

[DCRANER]

Originally posted by fyrfyter4393:
Keep in mind that 33s are alot heavier than 30s. So, are you suggesting the 4.56's is the best choice with 33's and a 5-speed?

[00TJ4L]

Originally posted by DCRANER:
</font><blockquote>quote:</font><hr />Originally posted by fyrfyter4393:
Keep in mind that 33s are alot heavier than 30s. So, are you suggesting the 4.56's is the best choice with 33's and a 5-speed? </font>[/QUOTE]I wouldnt do that if you drive on the highway at all. My buddy has a TJ with 33s and 4.56 gears, and its too much. He hates in on the highway, he cant do any faster than like 70 and still be at a manageable RPM. Consequently his fuel mileage sucks. About the extra weight, he runs steel wheels and MT/Rs, neither of which are light. He wishes he had 4.10s.

[hard core XJ offroader]

i go 4.10's if you know your never going bigger than 33's

[mrbeerbaitnammo]

You need the 3.73-up carrier for the front, in the rear the TrueTrac is the carrier.

You only need the carrier, you should be able to re-use your current spiders and such, from what I can find on Quadratec it seems that the Dana30 carrier is $200? That sounds more like the assembled carrier price, and not just the carrier, I'd call and find out.
that is for the carrier only, i got my new carriers from JT's Ring and Pinion for under 200 dollars for both of them together www.ringpinion.biz (http://www.ringpinion.biz) the owner is a good guy he was such a great help he answered al my questions and plus he ships and supports us servicemembers who are stationed overseas

[Slowride]

Originally posted by DCRANER:
Sorry, probably been answered thousands of times, but...............

I have a 97 TJ 4.0 5-Speed with the stock 3.07 gears, Dana 30 & Dana 35 (open rear), and 33" tires. Yes, a stupid combination.

No offroading, very little highway, mostly around town, my dog's gums flapping in the breeze, etc.

So, to get it in the "sweet spot" would 4.10's do it or would 4.56's make more sense? Not worried about gas mileage, just want a nice running Jeep.

I'd go with 4.56s for great all around performance.

[fyrfyter4393]

Really, it all depends on what you want. Do you want a little more power, or better fuel economy. Here's a chart that may be pretty helpful. clicky (http://www.4lo.com/calc/geartable.htm)

[DCRANER]

Originally posted by fyrfyter4393:
Really, it all depends on what you want. Do you want a little more power, or better fuel economy. Here's a chart that may be pretty helpful. clicky (http://www.4lo.com/calc/geartable.htm) O/K, almost never on the highway and would not want to go over 65 MPH with 33" clunky GY MT/R's anyway. Don't really care about gas mileage, not a daily driver, and would like a little performance boost. It's a weekend toy.

The chart you refer to shows @ 65 MPH @ 1:1 ratio, meaning 4 th. gear in my 5-speed trans. So, with 4.10's RPM = 2,720, very close to a 30" tire with 3.73's (a normal stock Sport TJ). With 4.56's RPM = 3,018, but if 5 th. is a .79 ratio that would be about 2,400 RPM's in 5 th. @ 65 MPH.

The above and the fact that the GY MT/R's weigh 57 lbs. and have much rolling resistance vs. stock tires maybe 4.56 would make sense for me.

Since I am a Dummy in the Wrangler world I leave it up to you experienced guys, so, overall please make the call here for me, I will trust your judgement.

4.10 or 4.56 ? (3.07's have to go...NOW!)

[fyrfyter4393]

If it was my choice to make, I would go with 4.56. You should feel a little more power than stock, but at the sacrifice of top highway speed, which you've already said is not an issue.

[wissemeier05]

i chose 4.56 and it my daily driver,and i love it!! i skip 1st gear now ;)

i find this gear chart MUCH more helpfull as it give u speed vs. RPM and RPM vs speed final drive raitos and final low range raitos

GRIMM'S gear chart (http://www.dfw-tx4wd.org/Tech-Dept/Tech-Dept/gears.html)
just plug in ur stuff and go-you can plug in the 4.10 and the 4.56 and compare them side by side and see the advantages/disadvantages of both...

"I have a 97 TJ 4.0 5-Speed " that is an AX15 tranny and an NP231 transfer case, (no under drive)

[DCRANER]

Originally posted by wissemeier05:
i chose 4.56 and it my daily driver,and i love it!! i skip 1st gear now ;)

i find this gear chart MUCH more helpfull as it give u speed vs. RPM and RPM vs speed final drive raitos and final low range raitos

GRIMM'S gear chart (http://www.dfw-tx4wd.org/Tech-Dept/Tech-Dept/gears.html)
just plug in ur stuff and go-you can plug in the 4.10 and the 4.56 and compare them side by side and see the advantages/disadvantages of both...

"I have a 97 TJ 4.0 5-Speed " that is an AX15 tranny and an NP231 transfer case, (no under drive) Thanks for the Grimm's chart.

I ride around @ 35, 45, 50 MPH in my area. So, with 4.56 and in 4 th. gear my RPM's would be 1,625...2,089...and 2,321. The 4.10's would be a few hundred RPM's less, kind of "doggin it" I think.

So, I am beginning to lean towards 4.56's, cruising around & shifting at about 2,500 RPM's, seems just about perfect. And keep in mind; K&N, Fire Power Ignition, Banks Cat Back, and maybe a Hypertech.

Thanks again, very informative.

[kwrangln]

When in doubt, go for the lower gears. Its better to rev an engine than to lug it. Tis better to give up a lil top end for better low end grunt which is what we need on the trail.

3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to.

[DCRANER]

Originally posted by kwrangln:
When in doubt, go for the lower gears. Its better to rev an engine than to lug it. Tis better to give up a lil top end for better low end grunt which is what we need on the trail.

3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to. Yea! That's 3 to 0 votes for 4.56.

I'm new to Jeeps but a drag racer since the late 60's, used to have a 56 Chevy with 5.88 locked rear.

[kwrangln]

I swear by 5.38's in jeeps, just change everything else to get it to work. ;)

[DCRANER]

Originally posted by kwrangln:
I swear by 5.38's in jeeps, just change everything else to get it to work. ;) That would be cool, but would probably snap my stock axles like a pretzel.

[OhioYJ]

That's 3 to 0 votes for 4.56I believe a few people have mentioned 4.10s already in the post.

[DCRANER]

Originally posted by OhioYJ:
</font><blockquote>quote:</font><hr />That's 3 to 0 votes for 4.56I believe a few people have mentioned 4.10s already in the post. </font>[/QUOTE]Yes, you are right. I am probably looking for a reason for 4.56, sounds better than 4.10. Oh well.

[OhioYJ]

The 4.56 will work, you don't do much highway driving, go for it, espeically if you think you may go larger on the tire size. Like I said 4.10s were good with 33s, but with my 36s they sort of suck. If you ever think you may go 35s you may want to do the 4.56s the first time.

[DCRANER]

Originally posted by OhioYJ:
The 4.56 will work, you don't do much highway driving, go for it, espeically if you think you may go larger on the tire size. Like I said 4.10s were good with 33s, but with my 36s they sort of suck. If you ever think you may go 35s you may want to do the 4.56s the first time. The real reason I am thinkikg 4.56 is if I go to the Grimm's chart the 4.56 combo is very close to a 3.73 with 30's, and the 3.73 30's, if I am correct, was a stock factory combo., somewhat mild. If I plug in 4.10's on 33's I am a few hundred RPM's under that 3.73 30 combo.

So, with the haevy 33's and more rolling resistance vs. stock tires I thought the 4.56, although sounding sort of "overkill", may really make sense.

[zachv]

Be done with the decision and go with the 4.56s. You want them and will always kick yourself if you do not. Your application screams 4.56.

[wissemeier05]

the highway is really not to much of an issue w/the 4.56 i drive it every day 30-50 miles round trip just on the highway, i do another 10miles on normal street all this just going to work and school each day.

take a look at it this way,
4.56 on 33's 65mph is 2384 in 5th 3k 5th=81
4.10 on 33's 65mph is 2143 in 5th 3k 5th=90

idk about u but 75-80mph is plenty fast enough in a lifted jeep in my opinion, anything past that i would get a little nervous (in saying that i am no speed demon in a normal car) how often do u go 90mph in any vehicle? the 4.56 has awesome tork and power on the 33's.

the power is better w/4.56 but the gas will be a little better on the 4.10. In my opinion -hell its a jeep- a large box on heavy wheels and axles, if it was ment to get good gas millage it might resemble a slightly aerodynamic (SP) shape..

when u look at ur next tire size (if u plan on it,i am)

4.56 on 35's 65mph is 2247 in 5th 3k 5th=86
4.10 on 35's 65mph is 2021 in 5th 3k 5th=96
-the little extra RPM is def worth it for me as far as a heavy 35 is concerened, and w/35's i would definatly not wana be flying down the road at 90+

another think to look at is the low range
4.56 on 33's final low range raito 1st=47.33 Reverse=52.15
4.10 on 33's final low range raito 1st=42.56 Reverse=46.89

Originally posted by kwrangln:
3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to. funny u say that i was riding w/a TJ-4.0-AX15 (MIKE!!) shift into 3rd while doing 60-75 up hill on the highway

[olivesta500]

Originally posted by wissemeier05:
</font><blockquote>quote:</font><hr />Originally posted by kwrangln:
3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to. funny u say that i was riding w/a TJ-4.0-AX15 (MIKE!!) shift into 3rd while doing 60-75 up hill on the highway </font>[/QUOTE]meh, remember what size tires and what gears mike has and its not as crazy ;)

[wissemeier05]

Originally posted by olivesta500:
</font><blockquote>quote:</font><hr />Originally posted by wissemeier05:
</font><blockquote>quote:</font><hr />Originally posted by kwrangln:
3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to. funny u say that i was riding w/a TJ-4.0-AX15 (MIKE!!) shift into 3rd while doing 60-75 up hill on the highway </font>[/QUOTE]meh, remember what size tires and what gears mike has and its not as crazy ;) </font>[/QUOTE]well when he shifted down at 65mph 3rd started at 3351....he went to 70-75 b4 he hit 4th...i think i pooped my pants,i though 4 shure we were gonna blow the engion or the d35...

[olivesta500]

Originally posted by wissemeier05:
</font><blockquote>quote:</font><hr />Originally posted by olivesta500:
</font><blockquote>quote:</font><hr />Originally posted by wissemeier05:
</font><blockquote>quote:</font><hr />Originally posted by kwrangln:
3K rpm is no biggie for modern (yea, like that applies) jeep engines, so dont worry about spinnin them a bit more than your used to. funny u say that i was riding w/a TJ-4.0-AX15 (MIKE!!) shift into 3rd while doing 60-75 up hill on the highway </font>[/QUOTE]meh, remember what size tires and what gears mike has and its not as crazy ;) </font>[/QUOTE]well when he shifted down at 65mph 3rd started at 3351....he went to 70-75 b4 he hit 4th...i think i pooped my pants,i though 4 shure we were gonna blow the engion or the d35... </font>[/QUOTE]well lets remember who were talking about here.. the word crazy does come to mind.

back on topic... i have 33" tires with 4.10 gears. i like them enough to not run out and have them changed to 4.56 but having said that, my opinion is to go with the 4.56. there have been a few times i wouldve liked the slower crawl speed. when i build up my next set of axles and go to 35s ill most likely be putting 4.88s in. it sounds kinda low but my jeep isnt my daily driver and only sees the highway on offroading trips and the lower gears will be helpful on the trail.

[00TJ4L]

Originally posted by zachv:
Be done with the decision and go with the 4.56s. You want them and will always kick yourself if you do not. Your application screams 4.56. He is right. Once you consider that your Jeep is a weekend toy and doesnt see much highway, I agree. Go with the 4.56s.

[mrbeerbaitnammo]

idk about u but 75-80mph is plenty fast enough in a lifted jeep in my opinion, anything past that i would get a little nervous (in saying that i am no speed demon in a normal car) how often do u go 90mph in any vehicle? the 4.56 has awesome tork and power on the 33's.
i am stationed in germany....lets say the AUTOBAHN is a wonderful thing, doesnt get to hairy until you hit 300 k's per hour whis is almost 180 MPH.... i love my audi on the autobahn, no wheel shake until 295k's @ 3500 RPM, i will be hatin life on the highway when i get back to the states...lots o' tickets for me

[DCRANER]

Originally posted by 00TJ4L:
</font><blockquote>quote:</font><hr />Originally posted by zachv:
Be done with the decision and go with the 4.56s. You want them and will always kick yourself if you do not. Your application screams 4.56. He is right. Once you consider that your Jeep is a weekend toy and doesnt see much highway, I agree. Go with the 4.56s. </font>[/QUOTE]You're all right, give me the $hithead award, 4.56's it is!

I must be nuts to think anything else. I have a Chevy Avalanche with 305 / 50 / 20's, an 86 GMC drag race / street pick-up with 325 / 50 / 15's (rear), then throw in my Harley WideGlide with killer pipes, etc., so how could I have a Jeep with whimpy (IMHO) gears. DONE!!

So, I will order, correct me if I am wrong;

4.56 Ring & Pinion (FR. & RR.)
New carrier for front Dana 30
Detroit TruTrac Dana 35 rear(no new carrier needed)
Overhaul kits (FR. & RR.)
80 / 90 regular fluid for 500 miles, then RedLine.

[Slowride]

Don't worry about the 4.56s on the highway because the 5th gear OD you have will knock those rpms down a bit from 4th. Most all "optimal gear" charts I know of only use 4th gear or 1:1 in their computations and do not take into account a 5th or even 6th gear OD. These trannys allow you to run a deep gear without worrying about highway rpms. The only people that really need to "worry" about running too deep of a gear are the guys running the "old" 3spd auto trans without a OD.

[kwrangln]

Grimm's ratio calculator does indeed take 5th and even 6th gear into account. OD is a wonderful thing.

[OhioYJ]

So, I will order, correct me if I am wrong;

4.56 Ring & Pinion (FR. & RR.)
New carrier for front Dana 30
Detroit TruTrac Dana 35 rear(no new carrier needed)
Overhaul kits (FR. & RR.)
80 / 90 regular fluid for 500 miles, then RedLine.Looks good, I thought of one last thing, you will need a new speedo gear so your speedometer will be correct. It doesn't cost much, and is easy to install.

[DCRANER]

Originally posted by OhioYJ:
</font><blockquote>quote:</font><hr />So, I will order, correct me if I am wrong;

4.56 Ring & Pinion (FR. & RR.)
New carrier for front Dana 30
Detroit TruTrac Dana 35 rear(no new carrier needed)
Overhaul kits (FR. & RR.)
80 / 90 regular fluid for 500 miles, then RedLine.Looks good, I thought of one last thing, you will need a new speedo gear so your speedometer will be correct. It doesn't cost much, and is easy to install. </font>[/QUOTE]Yes, and speedo gear. Thanks a lot. My 97 TJ should be real nice after all this.

Is Quadratech a good place to order everything?

[zachv]

Originally posted by DCRANER:
Is Quadratech a good place to order everything? Yes, Q-tec is the best around for customer service and fair pricing, plus with being in NJ you will get most things in a day or so.

[Jerry Bransford]

Originally posted by DCRANER:
</font><blockquote>quote:</font><hr />Originally posted by 00TJ4L:
</font><blockquote>quote:</font><hr />Originally posted by zachv:
Be done with the decision and go with the 4.56s. You want them and will always kick yourself if you do not. Your application screams 4.56. He is right. Once you consider that your Jeep is a weekend toy and doesnt see much highway, I agree. Go with the 4.56s. </font>[/QUOTE]You're all right, give me the $hithead award, 4.56's it is!

I must be nuts to think anything else. I have a Chevy Avalanche with 305 / 50 / 20's, an 86 GMC drag race / street pick-up with 325 / 50 / 15's (rear), then throw in my Harley WideGlide with killer pipes, etc., so how could I have a Jeep with whimpy (IMHO) gears. DONE!!

So, I will order, correct me if I am wrong;

4.56 Ring & Pinion (FR. & RR.)
New carrier for front Dana 30
Detroit TruTrac Dana 35 rear(no new carrier needed)
Overhaul kits (FR. & RR.)
80 / 90 regular fluid for 500 miles, then RedLine. </font>[/QUOTE]I agree with the 4.56. I would only add for the gear break-in period a small bottle of friction modifier additive which will help the gears run a bit cooler during their break in. It was several ring & pinion experts gave me that tip many years ago.

After the break in period, it's no longer needed to run that additive though it never hurts. smile.gif

[DCRANER]

Originally posted by OhioYJ:
</font><blockquote>quote:</font><hr />So, I will order, correct me if I am wrong;

4.56 Ring & Pinion (FR. & RR.)
New carrier for front Dana 30
Detroit TruTrac Dana 35 rear(no new carrier needed)
Overhaul kits (FR. & RR.)
80 / 90 regular fluid for 500 miles, then RedLine.Looks good, I thought of one last thing, you will need a new speedo gear so your speedometer will be correct. It doesn't cost much, and is easy to install. </font>[/QUOTE]Just ordered all parts for gear change + TruTrac rear, but Quadratec says 36 tooth (#55200 36)for speedo, 33" tires & 4.56, but JEEPIN.COM site says gps verified is 39 tooth (#52067639).

Can someone verify which is correct?

[hard core XJ offroader]

it's a 39 tooth for 33's and 4.56's... heres where i got it http://www.raingler.com/jeepReference/speedoChart.html

[wissemeier05]

Originally posted by hard core XJ offroader:
it's a 39 tooth for 33's and 4.56's... heres where i got it http://www.raingler.com/jeepReference/speedoChart.html i think it is vehicle year specific cause that is a TJ chart...and i called Advance adapters today and they told me a 36 for my year...


-i call q'tech today and they told me they do not carry the spedo gear for my 1990 4.56 33 (they verified the 36 tooth also)
was the rep. mistaken?

[hard core XJ offroader]

hmmm well i wonder what you would need for an XJ then. its a 242 t-case