Hi everyone, I have an 88 IROC with a 9 bolt rear. I am swapping in an 86 10 bolt rear end. The rear is complete with disks, and my 9 bolt has disks. Will this rear bolt right in? Do the brake lines line up and will I need a new proportioning valve? Also, my 9 bolt has 28 spline axles, does anyone know if these will fit in the 10 bolt if I get a 28 spline posi? Thanks everyone for any help.

the axle shafts are different from 9 bolt to ten bolt. wont work. ten bolt shafts are held in by c-clips from the inside and 9 bolt axle shafts are bolted into place from the outside of the rear end. as far as installation its all bolt it. no prop. valve needed since you are factory disc. the rear youve got is 26 spline.