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02-10-2011
I have an 04 GP GT and when I'm driving and go WOT it will get to 90mph and then just sit there while its at like 6k-7k RPMs. To go over 90 I have to release the gas and then slowly push it past 90 but right when I go WOT when I'm over 90 it downshifts and gets stuck at 90. I'm pretty sure this isn't normal but does anyone have any ideas what is causing this?
02-10-2011
Please confirm that 6-7K rpm. If so, your pcm has something changed in it. This may explain the lack of a shift into the next gear.
02-10-2011
It's at about 6200 when it gets stuck. And I have a DHP PCM that I put in about 100 miles ago and since then It now gets stuck at 100mph instead of 90 but it still does the downshift when I go WOT over 100
Here are some videos of it:
YouTube - Tranny Stuck
YouTube - Downshift
02-10-2011
I would tell them.
02-10-2011
Well I don't think its the new pcm because it would do the same thing before when I had the stock one except it did it when I hit 90 instead of at 100
02-10-2011
So... Just to be clear, this happened with your stock pcm and the DHP?
If so its probably a trans issue. I would say trans pressure???
Edit: Ninja'd you answered the first part.
Originally Posted by W-Body Store
02-10-2011
How would I go about fixing that. Would I have to take it to a shop or could I do this myself?
02-10-2011
I would take it to a tranny shop if you don't know transmissions. It could be as simple as a hole in a line or something as complicated as a gear being ground down, but I'd let a pro figure it out.
Originally Posted by W-Body Store
02-10-2011
Ok thanks. Also I had the transmission fluid flushed when I first got the car and it had 134k on it. Could they have messed up or something?
02-11-2011
Since your in Indy.. call up PRJ and go see what he says. Probably toss a better tune on it and fix all the issues.
02-11-2011
I'm thinking about doing an HD differential upgrade could that fix this issue?
02-11-2011
No...that won't do anything but make the differential stronger.
It's in the tune...are you sure the PCM was year specific? I bet your car is doing the same thing mine did...mine is an '03 and had to have a year specific PCM since the transmissions are different internally.
Then again...just to be on the extreme end...what are the mods done to the car? Just a PCM? Other thing might be some CRAZY knock levels.
02-11-2011
Well I bought the DHP pcm for the 2004 gp. and I dont think it would be the pcm since it did the same thing with the stock pcm but then again I am a noob
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