When you drop to a certain speed between 50-60 mph the truck slides out of o/d and it's a pain to find it again..usually only happens while the engine is warm and has been running a long time.The TPS looks fairly new on the truck, what else could it be?Something down by the transmission?

 

remoce and clean and re pack with dialectic grease all connections. workd for me so far.

jiMMy

 

Mine was going in and out of OD or not going into OD at all on flat ground. I really noticed it on up grades with no loads and part throttle. I did a trans service and it cleared up.