Not sure the difference between the 47 and 48; but with the 48 the park rod is left on the VB while you manipulate the other end into the sprag, and at the the same time, rotating the driveline slightly eachway until you feel it lock. The issue w/getting it in is that you have to unbolt the driveline from the diff to spin it if you dont raise the truck like I dont (4. 5" lift). I tried to get the rod in the sprag w/o turning the driveshaft and it wasnt happening!