bronco acelerate funny

I have a 1994 ford bronco xlt with auto 4x4 and in two wheel when you acelerate fast, passing gear it feels like somthing is dragging
cause it viberates and acels slower than not in passing gear, checked driveline ujoints,wheel bearings don't know?
please help

if you got those auto locking hubs , they could be faulty an be locked in, seen it happen MANY times , jack up front axle an turn wheel , see if the axle shaft turns also, if it does then the hub is locked in. Normally you gotta replace them -------

you gotta do both sides ------