Ford F-150 4X4

When you say manual shift are you meaning the transmission is a 5 speed manual or the trasfer case is manual shift. And also do you have automatic lock outs? Answer these questions for me and I can posibly fix your problem.(NOS) 8)

The only thing I can think of right off had is the front lockeouts are kicking out which unlockes the front wheels. I'am asumeing they are automatic lockouts. The best recomandation I can give is get a set of milemarker lockouts. Granted you'll have to get out of the truck and lock the fronts in, but if your going four wheeling you want that stuff to work. Thoes automatic lockouts are ok, I can tell ya you'll be stuck more than your not there not very dependable. But they will get you stuck every time some times one will work and then both and then maybe. Onece ayear the other's have to be taken off cleaned and new light film of grease added and you good to go if your transfercase is staying locked in then it has to be your lockouts hanging up.(NOS) 8)