I am hunting down a drivetrain shake and am wondering if it is from my Polyuerethene transmission mount by Energy Suspension. I would like to what the size difference is from a rubber to poly mount. I would measure mine but I therw the old one. I know there is a difference, people say you have to shim them, but how much?

 

The energy trans mount is about 1/4" taller than a stock rubber mount due to the use of that preload plate. I have found this height difference to cause vibration problems in several different cars. My advice would be to swap back to a stock rubber mount and see if the vibration goes away.

 

If your using the plate just take it out and bolt the poly mount back up. It buts against steel anyway so no need for it. Mine vibrated as well so i took out the plate and it went away. The plate seems to be the problem in the cars ive used the poly mount on. I sure dont miss having to change out the broken rubber one everytime i put my foot into it.

I could tell no real difference in vibrations from the rubber to poly. If you do have a problem elsewhere though. The poly will only make it show up more.

 

Right you are! I shimmed the crossmember a hair also, what a difference. The only down side is that I just lost the backmassage everytime I drive now.

 

i ended up puting a second plate in mine because its so low. i tried to set pinion angle by putting an extra plate in, but i couldnt do alot to change it. i basicly did it to compensate for the rear being moved up in the chassie. my vibration went away with an extra plate.

 

The only way to really adjust pinion angle is with an adjustable torque arm and LCAs. Without adjustment you could end up causing the suspension to bind, because the factory alignment has been altered. This isn't the hot ticket for good ET or handling.