[curtis73]

Well, that brings up the rest of the story. The 447 transfer case you probably have in there is a 30/70 torque split. If you took the front driveshaft off, it would just slip the front only sending 70 of the torque to the rear. If you pulled the rear driveshaft, you'd only get 30% to the front. It can be done, but you'll need an actual 4x4 transfer case, or find a way to lock your transfer case to permanently tie the front and rear outputs together.

The "proper" way to do it is to go get the parts from a 2wd blazer and swap them over; transmission, rear driveshaft, complete front suspension including brakes, spindles, control arms, springs, hoses, etc. For that cost, though you could probably buy a 2wd blazer.