So for about a month now I've been feeling constant vibrations when im driving. I drive a 94 firebird formula 5.7l. In park or at idle it doesnt vibrate at all, only when Im crusing at 1200-1500 rpms and it doenst matter what gear Im in. It also vibrates from 1500-2000 rpms when Im going up hills, etc. I was just wondering what it could possibly be. I got the tranny rebuilt awhile ago but its still strong, shifts when its supposed to, and I havent lost any power. U-joints? Tranny Mount? Let me know...Thanks

Differential mounts too.

Your best bet is to throw it on a lift and have a look.

-Richard-

Yea I'd just like to get a few idea before I put it up. I fergot to mention that I feel the vibration in the center console through the shifter and also on my drivers side floor board

i think the trans mount sounds like a good thing to check.... good luck