hello guys, i'm having kinda the same problum but what i have is a 1999 grand prix gt, and it will shift from 1st to 2nd just fine and dont want to shift to 3rd untill you get to 50+ mph, and then its a hard shift but does fine after it shifts, but when you slow down it wont take passing gear or 2nd till you get down to about 35 mph and then the same thing increasing speed to 50+ to hit 3rd again. i'm not sure if its the 3/4 solinoid or tcc solinoid, or accumulator's or what. can anyone help me please? thanks so much.
michael