Just had the trans rebuilt. 1996 ram 1500 5.2 2WD. Couple issues... First, it shifts into 2nd around 15-20 mph but then won't go to third til almost 50 mph or over (unless I feather the throttle, which I shouldn't have to do) Secondly, it seems worse when the weather's hotter. Took it back to the rebuilder, he adjusted the throttle valve cable on the engine, but it's still happening. Any other ideas? Or tv cable adjustment still the answer?Thanks!