[dracula4999]

The reason why the 4x4 wont work is because on a 2wd you have spindles that hold the brake calipers and rotors, the spindles are connected to the a arms. On a 4wd you dont have a arms, or spindles. You have axle shafts and hubs. If you can find a 73-87 2wd truck dirt cheap (and you can) the whole front end can be unbolted from the frame and changed over to your truck which would give you the later model motor mounts and brakes. Or you can just take the brakes off and switch them over.