: Took truck to dealer for the recall last week (replace ball joints on throttle linkage) when I got the truck back it seemed ok except for later shifts under heavy throttle. :
when I hooked to my gooseneck approx. 5k lbs. running with od off when I hit a steep grade the trans would downshift or tcc unlock. I could let up on throttle and it would lock back up. just couldn't give much throttle. I checked the tps it was set at . 85 at idle and 3. 88 wot. the tv cable had no slack and was set 1to1 with the throttle. truck also shifts late under wot.
didn't do it before I had the recall done. trans shifts firm with no slippage just can't stand the downshift going up a short grade. ??????????what can i do to help my problem??? truck has 96K and fluid and filter changes regular. soaked tps with cc still the same.

