Energy Suspension Tranny Mount
Picked up an Energy Suspension Polyurethane transmission mount from LMPerformance.com for $20 + shipping. I was a little concerned with noise and had heard that the ES mounts weren't as stiff as the Prothane so that's what I went with.
Install is relatively easy. Instructions can be found at installuniversity.com. I also followed advice from this thread: http://www.ls1tech.com/forums/showth...n+tranny+mount
I tightened all bolts to stock specs. It took me 30 minutes and I took my time.
There is more interior noise. I'd say it's equal to what you'd get from a performance exhaust. The noise does sound a little deisel-ish though. Here's what I gained...Shifts are firm and smooth. No more clunks when I don't match the revs exactly or release the clutch too quicly. It's also much tougher than the stock rubber mount so you don't have to worry about it breaking.