allproroofing
New Member
Got a 1993 k3500 dually 4x4 with 128,000 miles on it. The transmission shifts fine under normal driving conditions. If I put my foot in it and get on it , it will stay in 4th gear and down shift normally when I slow down to make a turn , after making the turn and picking up speed the tranny will not go into 4th gear. If I pull over , turn the truck off , wait a couple minutes and refire , the truck will climb through the gears just fine like nothing was ever wrong. Why only lose 4th gear after getting into the accelerator hard?