When I rip into it my gear shift lifts by about 5 inches. It is a standard and have been told possible cracked tranny mount. Anyone experienced this? I have a 1997 SS.

 

Super common for a manual. A poly mount will give better service, but will not isolate vibration as much as a normal rubber mount. In the past there was a mount for the 1LE equipped cars that was a more durable rubber unit, but the separate part number was done away with.

 

Maybe just buy the regular mount more often?

 

just replace the trans mount...and look at the motor mounts also....they also may be done

I use the Black energy suspension ones for MM and a stock rubber trans mount