Lately as temperature have dropped, I am noticing occasions, seems like when engine is cooler, of a stall in shifting between 3rd and 4th gears. Other gear shifts appear to be normal, but the 3rd to 4th is a delay causing an extra rev to 3000 RPM before shifting instead of the 2 to 2.5 k RPM. After driving a bit, it shifts normally again, that is unless I stop and truck cools down a bit.
Any thoughts on cause?
Any thoughts on cause?