My truck has an odd (to me) issue.....

Truck drives fine no pull in unlocked (manual hubs) 2WD mode
Truck drives fine no pull in locked 2WD mode
Truck drives fine no pull in locked 4WD high or low
Truck pull right after you go from 4WD High back to 2WD mode sometimes only for a few miles sometimes for more...

Hubs are manual and are staying locked so I don't think the hub has anything to do with it. is there someway a U-Joint or front diff could be binding?

any idea?

 

im guessing you have a 44ifs. may be a u-joint in the right axle shaft but i think it would do it anytime hubs are locked in

 

yes 44 ifs