I'm hoping some of you transmission wizards out there can give me a hand.
89 Bronco II, 2.9l EFI, A4LD, 4x4.

Trany does not shift from 3rd to 4th, no overdrive.

Anything external that could cause this?

I have a good salvage trany standing by if it's terminal.

Any pointers on good things to do while I've got it apart would be greatly appreciated.

Thanks in advance.

 

The wire connecter going to the shift sol. on the left side of trans may have come off....Ken.