Heres a cut and paste from a website that sells rearends
"All 1979-85 Mustangs came equipped with 7.5" rear-ends (7.5" refers to the diameter of the ring gear). 7.5" rear-ends also came in all 1979-04 non-V8 equipped Mustangs. The stronger 8.8" rear-end debuted in 1986 and still rides under all V8 Mustangs to date"
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