four wheel drive shaft replacement

ok now with Ford trucks (older models) the four wheel drive shaft is a difficult task when replacing the u-joints,. this model has a split pin yoke design that connects to the front axle. on the other end thats connected to the transfer case with four (12point head) bolts. every drive shaft is a different length, plus specific size U-joints.
remember to use a dash of lock thread to keep bolts from loosening, also stick to the required torque spec for safety reasons.