I have a 2001 Duramax with 230K miles on her. I purchased her with 220K and she runs great. I had to replace the injection pump, but other than that, she has been a solid truck. My only Mod's are a Stealth 2 programer I usually run in the economy mode or 50hp.
Today, I was driving home from work and I thought my truck was slipping in the 1-2 shift with mild acceleration...normal driving. Once I got off the freeway and came to a stop, the truck downshifted really hard at say, 5mph or slower. I was not sure if it was a fluke or what? So I tried to slow down to a stop again. It did it again... Now, when I come to a stop, it slammes into what feels like a granny gear. What gives?
For now, I plan on checking the tranny oil and recalibrate my Stealth 2 programmer for my stock settings, then put the tranny in learn mode...maybe this will help?
ANY HELP would be greatly appricated.