if you feel or hear it engage when put in reverse but will not move or even roll down the drive way. But rolls fine in neutral. a clutch pack is engaged that should not be.
If your Pontiac runs a 700r4 gm transmission you have stripped a reverse input shell. The transmission needs to come out for repair.
3 forward, 1 reverse
A Super Beetle with a manual transmission has four forward gears and one reverse. A Super Beetle with an Autostick transmission has three forward and one reverse.
your problem is the transmission. you need to replace the transmission
If this is an automatic transmission, more than likely the transmission is on it's way to the junkyard. Usually failing transmissions lose reverse first, then the higher forward gears - last will be the lowest forward gears.
an automatic transmission for Chevy cars or trucks. it's a four speed with overdrive, so technically a five speed transmission. It's only a five speed if you count reverse. The 700r4 is a THREE-SPEED with overdrive. four forward gears. (aka 4L60) NOT the same as a 4L60E. The 4L60 is a Vacuum modulated gearbox. The 4l60E is ELECTRONICALLY shifted...
A reverse idler gear in a manual transmission. It converts the reverse gears turning direction into the outputshaft to reverse its direction. The transmission can not spin clockwise when the reverse idler is engaged thus it only spins backwards not forward.
The transmission is broken. Take it to a shop.
The forward pump is shot or the throttle has a blown gasket
the forward gear clutch pack is worn out. the only solution is to get the transmission rebult.
The typical turbo 350 has three speeds forward and one reverse.
Your going to have to get your transmission rebuilt or get another put in.