Motor mount question???

[Mike 95 Wrangler]

I have a 95 YJ and have broken three motor mounts over its life. Twice on the passenger side and once on the driver side. My buddy has a 95 Cherokee and has broken several mounts also. He recently broke his passenger side again and a large piece of the block came with it. He is unable to fix it due to the block braking and is swapping another engine in.

With this new engine he is upgrading to a larger type bracket that uses the stock mount locations and also uses three to four other bolt holes located in the engine that were not used on the OEM mount. He stated that this is a known problem with the 95 4.0's and that I should swap out mine before I have the same problem.

Does anyone know of this problem with the 4.0's and if it is isolated to the Cherokee's? Also this got me thinking of upgrading to these other motor mounts in my Jeep to avoid future brakes.

[OhioYJ]

The newer 4.0 blocks (2000-forward I believe?) had a problem with the motor mount bosses on the block failing, destroying the block, but this is the first I've heard of a problem on the older Jeeps.

Just for clarification are we talking about the actual motor mount itself, or the bracket that attaches the block to the mount?

[DrLewall]

FWIW..I have a 94yj..175,000 miles and have NEVER had a broken MM..I have rebulit the tranny (at 93,000)..replaced the clutch one time (at 173,000)..replaced exhaust manifold once (at abt 140,000)..and thats abt it..my YJ has been a good rig..come to think of it, I seem to remember the last tune up was 7 or 8 yrs ago