joelegs1000

I figured this is the place to ask. For the past two weeks my tranny has been jumping from first to second gear back and forth until it warms up. The only time it acts up is when its about 30deg or below outside and today it now has a problem getting out of first to second gear (3200rpm until it shifts more than norm accell)even when the truck is warmed up at any acceleration. Ive checked the fluid and it is fine, any ideas would be appreciated before I take it into DC. I still have warrenty and never had a programmer/box on it if that matters.

thanks joe