1993 f150 5.7 Ltr 4x4. I have no 2 high. Trans in drive 4 high and 4 low work great. With the transfer case in 2 high hubs unlocked trans in drive or reverse truck does not move. WHY. Thanx

 

Possibly the rear differential or one of rear axles failed. Be safe and have a helper stand on the brake pedal and put the truck in gear while you watch to see if the rear driveshaft turns. If you decide to check that theory.

 

Thanx I will try that today.

 

Got the problem fixed. The linkage was rusted up. removed it a little grease reinstalled it all,s fine.