It's not an 8" or 9" for sure (unless someone modified the car) (doubtful) so I'm assuming you're asking about stock so I would say it's an 8.8". (My '95 has an 8.8" as stock). I believe yours is an 8.8" also since the last I think the 7.5" were used was in the 1980s cars.
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If the '86 was originally a V8 model, it had an 8.8" rear as original equipment. If it wasn't originially a V8 it had a 7.5" rear. But that doesn't mean the rear is original.buddry said:
The differential housing for each rear is unique. The easiest way to figure out which one you're looking at is by the shape of the differential housing's cover.
A 7.5" rear's differential cover has TWO FLAT SIDES and TWO CURVED SIDES. Here is a gasket:
An 8.8" rear's differential cover has FOUR FLAT SIDES. Hear is a gasket:
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