2 speede diff
https://www.ford-trucks.com/forums/7...peed-diff.html
Seems conversion to electric shift is possible according to a couple posts there. Not sure.
Do you have the vacuum pot on the axle and the shift **** in the cab?
See post 10:
https://www.ford-trucks.com/forums/1...-problems.html
The spring pulls it back to low, the vacuum holds it in high. That might be a clue as to how to plumb it.








