Hi all, My '99 2500 quad full bed Cummins automatic is real reluctant and skippy in the upshift. It seems to not like leaving second the most. Especially when it is cold. I live in NW Montana so that is most mornings. I took it to the dealer and they did a update on the computer but to no avail. I am reluctant to just start trying this and that like a filter and backflush for $165 then mechanic test drive at $75 and then... Any one had this or have a suggestion?

Thanks Jimbob, on my horse Daffy in montana hoping to shift better soon.

 

Same thing started happening on my '97 this summer. Turns out it was a grenaded pump. Had to yank the trans. Since I don't want to deal with this again, I converted it to a 5-speed manual. I've heard there are other possible causes to this 2nd gear thing, but I'm not sure what exactly they were. Try doing a search in the truck section of this forum.