[FrankieD]

I just swapped mine out from a 72 to my 70 the width of the rear housings are the same and the 5 lug axles are the same length of the 6 lug so I just swapped out the backing plates, drums and axles. I also put the complete front suspension in cross member and all, the only mod is the front 2 bolts that screw into the frame need to be modified I got lucky with mine the PO put new calipers and rotors on so that saved me some bucks.. You can use the complete front suspension all the way up to 87 on the pick up and to 91 on the 2wd blazers and suburban’s, the 73 up have better A arm bushing's and the Proportioning Valve is down on the cross member and not on the Master cylinder. Hope this helps and good luck