i got a b and m shift kit in my car when my trans was rebuilt along with a corvette servo tonight i was out cruising and messing around on this backroad and one time when it hit secodn there was aloud clunk and you could feel it through the floor did i break my trans mount? also on the way home i noticed if i hit the gas too hard from a stop it will do it and when it hits second if i am ont he gas too hard

 

Does it happen in reverse?
Are the the gears still shifting fine when you don't apply too much power?
If it does then jack up the car and take a look at it. It's a block of rubber between the tranny and crossmember, pretty easy to tell if it's messed up

 

I've had 15, give or take a couple of real scrappers, of these 3rd gen firebirds and ALL of them have had a broken trans mount. Buy an aftermarket poly mount, and you'll forget all about it. They don't even cost that much anymore, like twenty bucks or so.

 

i took it pout today to look at it it was complety torn so i took the truck and went and got an energy suspension polurethane one
cleared up all my problems