My E4OD mystery... Random Shifting

[topgunn]

I had same problem, erratic shift but no O/D light. It was checked out at trans shop many times,no answer, just diconnect batteries, clear problem. A couple years ago another trans shop told me about the connect between it and brake system. Last summer we changed to a ZF5, and while installing a new 5th wheel hitch, we found brake wires that had bare spots. We can't say for sure if that was the culprit, but it shure looked that way.

 

[NJGearhead666]

how do you increse line pressure? my trans on the highway tonight started to slip on 2nd to 3rd shifts under full throtle