Alright I just got my High Performance 4l60e tranny put in about 3 days ago. And today I am driving home from my friends house and when i gave it *** from a stop i hear a bang and the center console like shakes, like the tranny is slapping against the floor. So, I am thinking its the mount, What do u think?

 

yep, the mount went
happened in my rs
pretty easy fix and only costs about 20 bucks
search on differences between the poly ones and the stock ones

 

I tore mine in half not to long ago when the car was bone stock, I got an LS1 1LE mount cheap and put it in, no vibration and no problems since, the aftermarket LS1 bushings are stronger then that aftermarket LT1's and yes the LS1 mounts work for LT1 cars, I think its in the center section that they are stronger. Urethanes arenice but you get a little vibration. I have none in mine and it takes all the punishment I can give it. If you get it you will need to buy a different nut that holds the mount to the trans brace. It cost me like a buck for 3 and found a larger washer in my garage.