I have a 1990 Deville, I was driveing down the road at 30 mph I stepped on the gas and the front end begain to shake now all I have is frist and reverse gears. It wont shift into 2nd, third or overdrive. The fluid is full and I dont know when the last time it was changed, I just got the car a couple mounths ago. Is this an easy fix or am I looking at a new transmission? I would be happy to get any advise on this Thank You.

wrong forum...try posting in the deville forum...sounds like it'll be a purty pricy fix though, being transmission problems. Good luck!!!