Failure of the rear transmission mounts is common.Google+
Car Problem Reports
Pontiac Firebird Rear Transmission Mounts Commonly Fail
Pontiac Firebird Problem
Drive Trains Affected: Automatic Transmission, Manual Transmission
Average Mileage: 196,110 mi (109,000 mi - 297,000 mi)
rear transmission mount failure,can be fixed by replacing
with urthane mount.
Visitor, 1995 Pontiac Firebird, Automatic Transmission, 297,000 mi
replaced mount with energy suspension mount. worked ever since.
Visitor, 1994 Pontiac Firebird, Manual Transmission, 138,000 mi
just purchased car, had to replace throw out bearing - noticed rear trans mount wasted; apparently common problem ??!!??
Visitor, 1994 Pontiac Firebird, Automatic Transmission, 240,442 mi
I'VE HAD TO REPLACE THE REAR TRAMSMISSION MOUNTS SIX TIMES