Dodge Ram, not shifting into OD
1998 Dodge Ram 1500 v8 automatic 4x4 extended cab long box
Ok, friend called and said he pulled a light trailer (less than 2000 pounds) down state to Indiana and back. Dipshit was running in OD. He said everything was running fine for hours and then he stopped for gas and got back on the highway. When he did this, it would not shift to OD....at all. Not even try to go to OD. Just 1, 2, 3 and that's it. From what I understand, the converter doesn't even lock.
Pushing the OD button does nothing.
OD light not flashing but does come on when you push the button.
No check engine light.
He drove it to Indy in 3rd gear, no other issues. Called the dealer and they advised to disconnect the battery for half hour and then see if it shifts or tries. Nothing, exactly the same.
Drove it all the way home to the Soo with no issues.
Fluid nice looking, full, and not burnt. No leaks.
Any ideas on normal things other than "you need a new trans" that you know of (so I can research them) before I look at this thing?