Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The 8.5 A-body rear was never factory installed in a '71 or 72 Pontiac LeMans, GTO, or GrandPrix. This hsg and axle configuration of 8.5 A body rear was built by both Olds & Buick's axle plants & was originally used in their divisions '71 & 72 A-bodys.
Not all '71-72 8.5 A-body housings have the square lugs at the bottom, there are actually 3 different 71-72 8.5 A-body hsgs, with two of them not having the big square lugs. Many of the more common 8.5 A-body hsgs with the big square lugs that have been through my hands during a bench build have had the lugs ground down and reshaped so from the rear bumper view at a quick glance the looks like an 8.2 Pontiac rear.