Ring Gear size?
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Joined: Jul 1999
Posts: 17,262
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Ring Gear size?
GM switched to 7-5/8 around 1986. Basically everything else is the same as the 7-1/2" diff except the ring gear size. Even though your car will have a 7-5/8" ring gear, the diff itself is still referred to as a 7-1/2". All parts such as posi etc for a 7-1/2" will work in yours.
Joined: Aug 2006
Posts: 12,804
Likes: 103
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Ring Gear size?
and it "should" be 3:23, open, if its still the original rear and nobody has messed with it over the years.
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