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Unread 10-28-2013, 09:34 PM   #1
5point9Limited
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1998 ZJ 
 
Join Date: Oct 2003
Location: South Jersey
Posts: 661
5.9 Vibrations... Transmission mount? Help

Hey guys, My 5.9 is vibrating during acceleration. Starts at 20mph and lessens at 40. Slight vibes at 45-58mph then it gets bad. I had the rear tires balanced to no avail.
When I get underneath, It seems as though when I push on the trans near the transfer case, that it is loose and possibly not doing its job.

Do you think this is a trans mount? If so, what kind should I get?

Thanks!

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Goodyear MT/R 245-75-16, Mopar PCM ECU, 52mm APS Throttle Body AND spacer, Flowmaster Exhaust, Homebrew K&N Intake, Summit 3" exhaust cutout, OME steering stabilizer, 2.25" B. Boost, ProComp MX-6 adjustable shocks,
Up-Country springs.
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Unread 10-29-2013, 09:27 AM   #2
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 15,615
It could be

Trans mount
Motor mounts
Harmonic balancer is bad.

If the trans mount is bad you should replace the motor mounts with it because it's very likely they are bad as well. It could be other things like worn ball joints too. You just have to start ruling them out one by one. Take a short pry bar and try to move the motor up and down on the drivers side motor mount. If you can't move it then they are good. Here is what mine looked like at 127k miles. Totally shot.

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Unread 10-29-2013, 08:30 PM   #3
5point9Limited
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1998 ZJ 
 
Join Date: Oct 2003
Location: South Jersey
Posts: 661
Thanks man, I saw your video upon researching my problem. The vibrations are CLEARLY from the middle to rear of the Jeep. I'm doing the Trans mounts tomorrow. I'll report back. Thanks a lot.
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Goodyear MT/R 245-75-16, Mopar PCM ECU, 52mm APS Throttle Body AND spacer, Flowmaster Exhaust, Homebrew K&N Intake, Summit 3" exhaust cutout, OME steering stabilizer, 2.25" B. Boost, ProComp MX-6 adjustable shocks,
Up-Country springs.
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Unread 10-29-2013, 10:59 PM   #4
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, MD
Posts: 15,615
It's one mount. I strongly suggest doing the motor mounts as well. If they are bad it will wear the new trans mount out a lot faster.
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