Thought Id seen a discussion on this before but cant seem to find it. Have a t56 swap with hawks crossmember stock tranny mount. Odd vibration on intial take off in first gear and similar under hard acceleration. Have the energy suspension trans mount PN# 3.1108G that I want to install when I uprade the clutch this week could this fix issue or make it worse? Also I think Ive read that people are removing the plate that comes with it. Also car has been lowered about 1.75" or so in the rear using coil overs what will this effect as far as tranny mount/pinion angle, ubderstand the poly mount may be a tad taller. Thanks.

 

https://www.thirdgen.org/forums/tran...ison-pics.html

Here iss the link for tranny mounts

 

Thanks 572 linked helped quite a bit. One question I neglected however that i Didn't see the link cover was. Is it bad for the tranny mount to be stiffer than the motor mount. For example should I wait to do a poly tranny mount until I do poly motor mount or am I ok to do poly tranny and keep the rubber motor mounts for the time being until I get the chance to upgrade motor mounts?

 

You'll be fine. Many people run the poly trans mount without every considering the motor mounts.

JamesC

 

For minimum vibration, you want the crank & trans mainshaft to be parallel with the rear diff pinion shaft. This will make the U-joints at each end of the drive shaft, have equal angles. The main source of vibes is the drive shaft moving front-to-rear as it spins, which is caused by the U-joints not at the same angle. The poly mounts can cause or aggravate this by changing the trans angle; then, their added stiffness ALSO transmits more of it to the car chassis. An adjustable torque arm can basically cure it completely, by restoring the pinion shaft to being parallel with the engine/trans again. IMO having the shafts parallel and therefore the angles at the U-joints equal, is far more important than having the rear angle at any specific value.