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  • Information sites and vehicle specific numbers

    Just some transmission/transfer case information and supporting sites that I have found.

    Hopefully all who are gear heads can add to this or correct what is incorrect and gear heads/non-gear heads can find some useful information.

    Gear ratio calculator: http://www.grimmjeeper.com/gears.html

    Tire size calculator: http://www.dakota-truck.net/TIRECALC/tirecalc.html

    Transmissions:

    Manual NSG370, http://www.novak-adapt.com/knowledge/nsg370.htm

    Auto (4 speed, 2007-2011) - 42RLE, http://project-jk.com/jeep-jk-write-...ission-service

    Auto (5 speed, 2012-????) - W5A580

    Transfer case:

    X/Sport/Sahara: NV241, 2.72:1 low range

    Rubicon: NVG241OR, 4:1 low range, http://www.novak-adapt.com/knowledge/np241or.htm

    Axles:

    X/Sport/Sahara front: Dana 30 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).

    X/Sport/Sahara rear: Dana 35 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).

    Rubicon: Dana 44 with 4.10 gears.

    http://project-jk.com/jeep-jk-tech/j...er-axle-basics

  • #2
    Additional information for the W5A580 Transmission.

    http://www.allpar.com/mopar/transmis...AG1-WA580.html

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    • #3
      Differential identification:

      http://www.nationwideparts.com/differentials.htm

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      • #4

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        • #5
          A couple of more sites and some supporting numbers.

          Both are for calculating crawl and or final drive ratios.

          http://www.californiajeeper.com/crawl-ratio.htm

          http://www.4lo.com/calc/gearratio.php

          Gear ratios for the NSG370 (6 manual) are: (1) 4.46, (2) 2.61, (3) 1.72, (4) 1.25, (5) 1.00, (6) 0.84 and (R) 4.06.

          Gear ratios for the 42RLE (4 auto) are: (1) 2.84, (2) 1.57, (3) 1.00, (4) 0.69, and (R) 2.21.

          Gear ratios for the W5A580 (5 auto) are: (1) 3.59, (2) 2.19, (3) 1.41, (4) 1.00, (5) 0.83, and (R) 3.16.

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          • #6
            JK Tech write-ups

            This site has a variety of write-ups for a number of systems on the JK.

            http://project-jk.com/jeep-jk/jeep-jk-write-ups

            This site is basically the same information as the one above but also has write-ups added by individual owners.

            http://www.jk-forum.com/jk-write-ups...ite-ups-42710/

            Comment


            • #7
              I have a 2.5" tera flex budget boost on 2007 jeep wrangler sahara unlimited. What is the smallest rim and biggest tire size i can run?

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              • #8
                @ 07 - I've heard of people going down to a 15" rim, although I'm not sure how it worked out. I'm not a big fan of going to smaller rim size myself. They may fit just fine but one thing I always wonder about is how the brakes deal with it. With the smaller rim, you've got less air circulating around the brakes and if you happen to go through some mud holes, you've got less clearance for the mud and such to clear out. These two things may not even be issues but I believe that some things on a vehicle are best left as close as possible to how they were engineered. Just my two pennies worth.

                As far as tire size, that will depend on how you are using the Jeep. I've read about some people stuffing 35" tires in with a similar sized lift and wheel spacers but I can't see that leaving any flex room. I would say, to stay on the safe side, to keep it around 33" tires. You may have to use wheel spacers to take care of all rubbing issues but 33" tires with a 2.5" lift should give you plenty of capability for mild to moderate wheeling.

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                • #9
                  a 16 would be the best guaranteed fit. a 15 is hit or miss. most that work are steel wheels with 3.75" back space as i've read. some have had to do some clearance grinding to the brake caliper and/or knuckle. that said, it leaves very little room in there for cooling, and makes it easier to lodge rocks, debris and mud in there.

                  tire size depends on the tire itself. as stated, up to a 35, but its probably gonna rub. removal of fender liners, front lower air dam and trim/hammering of rear pinch-weld may be required.

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                  • #10
                    Great info and resources. Thanks!
                    Black 2008 Sahara 2-door Freedom Top
                    Black 2014 Grand Cherokee Limited

                    Comment


                    • #11
                      Originally posted by Rtone1583 View Post
                      Just some transmission/transfer case information and supporting sites that I have found.

                      Hopefully all who are gear heads can add to this or correct what is incorrect and gear heads/non-gear heads can find some useful information.

                      Gear ratio calculator: http://www.grimmjeeper.com/gears.html

                      Tire size calculator: http://www.dakota-truck.net/TIRECALC/tirecalc.html

                      Transmissions:

                      Manual NSG370, http://www.novak-adapt.com/knowledge/nsg370.htm

                      Auto (4 speed, 2007-2011) - 42RLE, http://project-jk.com/jeep-jk-write-...ission-service

                      Auto (5 speed, 2012-????) - W5A580

                      Transfer case:

                      X/Sport/Sahara: NV241, 2.72:1 low range

                      Rubicon: NVG241OR, 4:1 low range, http://www.novak-adapt.com/knowledge/np241or.htm

                      Axles:

                      X/Sport/Sahara front: Dana 30 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).

                      X/Sport/Sahara rear: Dana 35 with 3.21 or 3.73 gears (4.10 optional towing package in 07, 08 forward only 3.73 is optional).

                      Rubicon: Dana 44 with 4.10 gears.

                      http://project-jk.com/jeep-jk-tech/j...er-axle-basics
                      I just wanted to amend the statement in bold above with the following:

                      2007 2 door X/Sport/Sahara used the Dana 35.
                      All Unlimited (2007 and up) X/Sport/Sahara and 2008 and up 2 door X/Sport/Sahara used the non-Rubicon Dana 44.

                      My apologies to everyone who has taken this advice to heart. I misread the source material when I made the original post.

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