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I think my transmission is shot. Its a 4T60E in a 94 Grand Am. The car runs ok till its gets warmed up then the tranny just goes in and out of gear, also the speedo bounces all over the place. The speedo bounces a bit even when its cold when I hit big bumps. Ive checked the transmission fluid and its full, I have no idea whats wrong other than I think tranny is junk. This car is already on 3rd transmission(replaced B4 I bought it) The only other think is my CV shafts are REALLY bad, would that cause it? I dont want to spend money on the CV shafts if tranny is junk. Please help