I assume that you have done a 31 spline conversion on that 8.8? What year model did the 8.8 come out of. My buddy took disc's off of a Turbo Coupe rear end and put on his 8.8 rear end. But it was an 86 model 8.8 might not matter but it might... I dont know.
His works fine
Bradley
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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