the gears in the rear end of my blazer went out yesterday.i pulled the diff. cover off to inspect the damage and found pieces of the bearings.other than that i couldnt find much more damge. heres where it gets a little tricky..nothing seems to be original on this truck..including the rear axle.it appears to be a 12 bolt from various GM models from 1964-82.i have several options to go with here but want to spend the least about possible. i have a 77 F250 that ive given up working on for now with a Dana 60 with 4.56 gears.if i were to pull that axle out and put it on the blazer, what complications am i looking at if any? or i could just rebuild the one in the blazer but im afraid that could get pretty costly.. thanks for any help!