I have an 05 GMC 1500 and in the morning the trans shifts hard 1st to 2nd for the first 20-30 min of driving. I have been to 2 dealers, complained to GM and after 6 times to the dealer its still not fixed and now it also leaking a lot of tranny fluid. First trip they did something to the computer, didn't work. Second time they found a cracked acuator piston and bad valve body and that fixed the problem for about a month. Third time they noticed the hard shift but said they can't find anything and told me to let it warm up so it will go away. Then I called GM and they told me to try another dealer so I did. The second dealer said they can't diagnose it because of my Volant cold air intake. They tried a trans temp sensor which didn't work so I put the stock air box on as they said the hard shift would go away with the stock air box which it didn't. I brought it back and they said the computer was shifting -7% or something and reset it and said it was fixed and the problem will come back with the volant air intake. It was never fixed and I still have the oe air box on and now its also leaking. The second dealer insisted they fixed it and I need to go back to the first dealer that started working on the problem. What do I do? GM is really tiking me off and their deallers too. Why won't they just replaced the trans if they can't fix it?

 

take it back to the dealer and threaten Lemon law.... that will get thier *** moving

 

there's all kinds of crazy tuning to make your truck warm up fast, mine shifts wierd until it warms up too.

 

yeah but he is leaking fluid

 

Did this ever get resolved?

 

Well it was at the dealer for 8 days last October and they replaced a bunch of stuff, (clutch plate, reverse drum, springs, valve body, trans pump, and more that I can't remember). It lasted about 2 months and the hard shifts were back. I just took it in Monday with the trans problem, horn doesn't work, and a groan/clunk/squeek from the rear end. So far they called GM and got approval to replace the trans and its on order so I hope this works. This is the only dealer that actually has done work to it the other 2 kept trying computer stuff and replacing sensors. The other 2 never got into the trans and I guess didn't want to because I didn't buy it there.