I have a 98 bonneville, and if I step on the gas hard from a DEAD STOP the whole front end shakes violently. Took to a trans. shop and of course they wanted to rebuild it for $2500 saying the prob. was a bad gears design and the gears were not meshing correctly or some bs to that effect. He claimed the trans would completely fail in the very near future. Since then I just babied it off the line and have had no issues at all. 2 years later I'm still driving it(only if I hit the gas too hard from a dead stop) Anybody have a clue to what this problem is? I love this car but cannot afford a new tranny.. Thanks!