2001 Ram 1500 4X4. Issue just started today, without warning. I drove it to a buddies house and it ran fine. When I left 2 hours later, the transmission wouldn't shift from 2nd to 3rd.
Transmission was rebuilt 50,000 miles ago, and is ready for routine service, but I wouldn't think that's the problem.
My internet research leads me to believe the governor pressure solenoid and governor pressure sensor needs to be replaced. The service manual's diagnosis chart doesn't cover this specific issue.
Ideas?