Buick Regal Rear End Guide
General Information
All 1984-1987 Turbo Regals were equipped with GM's 10 bolt 8.5" rear end. The great majority of them were equipped with 3.42 gears, although there are documented cases of a few of the early cars having optional 3.73 gears. Positration was an option G80 in all years, however the "late build" or "extended run" Grand Nationals that were built in 3rd and 4th quarter of 1987 had the G80 bundled into the Grand National package.
Rear Ends

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