Browner
10-13-2007, 11:18 AM
I have a '03 GMC with a Full ATS Tranny, Aurora 5000, Twin CP3's, Injectors, etc. We just pulled the tranny out and replaced the C-3 Clutch pack. For some reason it was trying to go into 3rd & reverse at the same time and fried the C-3 pack. The wiring harness for the silenoids in the tranny was fried and we replaced that as well. Now, after putting the tranny back in my speedo doesn't work and the brake light and ABS warning lights are on. It also throws a DTC about the speed sensor. I had the Co-Pilot unplugged and it seemed to shift into all gears. I then plugged the Co-Pilot in and the tranny shifts fine through 3rd and then it commands 4th but just revs like its in neutral and gets stuck in 3rd. It won't leave 3rd gear after that and stays in 3rd even when stopping. If I turn the truck off for a minute it goes back to 1st gear and is good until I get back to the point where it commands 4th. The shop that has my truck has had my truck for 7 weeks and cannot figure this out. I need my truck back and am hoping someone has some ideas/advice for me. Thanks in advance, Chris.