Revery Hi Yo
Junior Member
I have a 2007 2500 with 5.9. Recent trip after dropping a 9K trailer with-in a few miles all of a sudden it started slipping in 2nd gear. It always pulled great before with no indication of slipping. Might mention towing has been about 20% of last 100K miles. It will not shift out of 1st, but let off gas and it slips into 2nd accelerate easy it's ok but a little harder on accelerator and it starts to slip. Won't shift up to 3rd with out letting up but once in gear doesn't seem to slip, same procedure to 4th and then it's locked and no problem. Scan does not display any codes. At 47K prior owner installed ATS 5 Star Converter and ATS tow valve body for better towing performance. Now has 168K but trans has had regular and routine service. Anybody have thoughts about problem. I thought maybe only valve body issue, but tranny shop guy says anytime it slips if worn out. Been ripped off before so trying to gain some knowledge. Thanks to all.