S8ER95Z

iTrader: (3)

I've been searching for two days... I've noticed people having issues with poly mounts and ditched the mounting plate with still no relief. The car vibrates like hell anytime I'm giving it gas. It gets worse as the RPMs rise and there is just a light vibration at any speed with the clutch in.

Is there an easy way to tell if I don't have the tailshaft at the correct level? I don't want to just blindly shim the transmission brace a million times until I find the correct spot and I'm worried that this might be an unbalanced component somewhere that will tear something up after a while.


I daily drive my car and do roughly 300 miles a week so I just need some ideas on where to start so I can get it all fixed. Thanks!

99Bluz28

iTrader: (35)

I've got the ES trans mount on my car and what I did is grind the 2 preload bumps off, and then install the mount with the preload plate as you normally would. I get a little more vibration then the stock trans mount, but nothing that drawls your attention, unless you car is whisper quiet!

S8ER95Z

iTrader: (3)

Yeah it's stock exhaust so all I can hear is the LS1 rattling away. I shimmed the brace down and that took away a lot of it... are the preload bumps the biggest problem? People keep saying it's a geometry issue and the mounts are the wrong height?

Thanks for the reply btw.

99Bluz28

iTrader: (35)

I don't know about them being to tall, but mine hasn't given/caused me any problems in the 6+ years I've had it on the car.

S8ER95Z

iTrader: (3)

Yeah the more I search around the more I am realizing there is something out of balance on the car. This should be fun....