91 4x4 auto can't seem to fix overdrive!
 

I have replaced the VSS and installed potentionometer in place of tps, still no OD. Speedometer is also still not working even after VSS change. Any ideas would be greatly appreciated.

How's the crank sensor? Maybe OD switch?

I had thought about the crank sensor. Anyone know the correct reading I should get off a good one?

The one was going bad in my 98 12 valve a while back, but I replaced it before the OD went out completely, but that is what was causing my speedo issues in that one.

Where abouts is the OD switch located?

Thanks!

BTW... was it hard to get the 2nd gen seats in that truck?