The original transmission was junk, pure and simple. It would go into overdrive, stay there for 10 seconds (or 30, however long it took for the computer to see the transmission was slipping) and then drop back into 3rd gear until the car was restarted. Had the dealership replace it (with a used transmission, those cheap bastards). This second transmission won't go into overdrive if I've been driving in 3rd gear for more than 30 seoncds or something, I never nailed down the exact cause of it. I have my third tranmission sitting at work waiting for a day when I can put it in, I just haven't had time to yet.
'94 Bonneville SLE | 266K miles
CAI - K&N cone filter - polished intake runners - 140 amp alternator - 2.5" exhaust - Magnaflow hi-flow cat - Magnaflow dual outlet muffler - 106K on engine and transmission - Sold 1/14/07
94 VW Jetta - 151K - 2.0 - 5 speed - Ghetto black steelie wheel mod - Techtonics 2.25" cat-back system