I have a good ZR2 8.5" disc brake rear for sale. It has the Auburn cone style posi, 30 spline axles, and 3.73 gears. Comes with alum. calipers and stock rotors. Gears are in good shape. This isn't the Gov-lok timebomb....the Auburn posi is a strong unit. Nice upgrade even for the old 28 spline 10 bolts. WMS to WMS is 63". That is just a shade wider than a GM A-body (62.5"). Easy to swap in with a ladder bar or 4 link setup. Still has the stock leaf perches on it now for those needing that for a different application. Located in Binghamton NY (13901). Price is $699/best.