vibration problem
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Teching In
Joined: Jun 2016
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vibration problem i did a energy suspension poly tranny mount swap on my 97 ss 6 speed and ive noticed now that on the hwy the car has a lot of vibration...it feels like its coming from the rear somewhere...would this have anything to do with the vibration? i did jack up the tranny to get the old mount out
TECH Veteran
Joined: Apr 2008
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The poly mount will transfer more vibration than the rubber mount. If you have poly motor & tranny mounts, even more.
Many, including me, who have poly motor mounts run the rubber tranny mount
jacking up the tranny didn't cause it
IDK if your poly mount is exactly same height as the one you took out so confirm nothing is grounding
Many, including me, who have poly motor mounts run the rubber tranny mount
jacking up the tranny didn't cause it
IDK if your poly mount is exactly same height as the one you took out so confirm nothing is grounding
Thread Starter
Teching In
Joined: Jun 2016
Posts: 4
Likes: 0
The poly mount will transfer more vibration than the rubber mount. If you have poly motor & tranny mounts, even more.
Many, including me, who have poly motor mounts run the rubber tranny mount
jacking up the tranny didn't cause it
IDK if your poly mount is exactly same height as the one you took out so confirm nothing is grounding
Many, including me, who have poly motor mounts run the rubber tranny mount
jacking up the tranny didn't cause it
IDK if your poly mount is exactly same height as the one you took out so confirm nothing is grounding
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
the poly mounts will transfer more vibration than stock rubber...so now you may be feeling some that were there before.
If the poly tranny mount is slightly shorter (thus lowering the engine) you "may" now have some "grounding" of exhaust on frame or something so look for that type of thing
your drive shaft may need balancing
do you have lower than stock rear gears?
If the poly tranny mount is slightly shorter (thus lowering the engine) you "may" now have some "grounding" of exhaust on frame or something so look for that type of thing
your drive shaft may need balancing
do you have lower than stock rear gears?
Thread Starter
Teching In
Joined: Jun 2016
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thats prolly whats happening...can u adjust the stock torque arm for correct pinion angle? all my suspension is stock except the lowering spings which i didnt install and my rims are 18s
Best thing to do is ignore the really complicated explanations on pinion angles. After its all said and done, the angles at both ends of the DS need to be the same.
Measure the trans angle using of all things the engine dampener. Measure the rear yoke angle using a socket on the U joint cap - make sure it's the one for the pinion yoke, not the one for the DS. If the trans angle is larger, shim the tail of the transmission up. If the pinion angle is bigger, put shims between the frame and trans cross member to lower it.
Mine went from 6 and 3 to 4 and 4. I had to shim the tailshaft up
