Need 4-speed Help

well the wheel on the ground cant turn,,,if it did it would fall off your jack,,and then you would be super man,,,,

im not exactly,,sure, maybe some one with more knolwedge can chime in here,,

if you have a limited slip rear center section,,i believe it switches back and forth to the wheel in need of traction,, what case do you have last 3 digits on the case of the center section,,drivers side of the case

741 742 489 ????

easest and cheapest way if you think its the rear,,,try to borrow a center section from some one for a day,,,,beats spending money if you dont need tooo,,,