Rear End Gears?
Thread Starter
Senior Member
Joined: Apr 2003
Posts: 717
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From: pittsburgh, PA
Car: 84 Firebird Trans Am
Engine: 305 4bbl HO
Transmission: 700-R4, 3.73 rear
Rear End Gears?
Ok, i know a little about the engine part of our cars but can someone please explain the rear end gear ratios? i have an 84 TA with the 3.73 rear. so does that mean i'm quicker than say 3.23 but slower at top speed? and what should i get posi wise.
Supreme Member
Joined: Jun 2001
Posts: 3,238
Likes: 4
From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
Yes, you are figuring that correctly.
A lot of folks really like the SLP Zexel-Torsen posi units at $99. That is the least expensive and probably longest lasting posi by a country mile! But you will have to get 28 spline axles to replace your 26 spline units in the 84. GM didn't start using 28 spline axles until late 1989 or so, so they aren't very common. However, Mosler makes them and they are about $250 US a pair.
A lot of folks really like the SLP Zexel-Torsen posi units at $99. That is the least expensive and probably longest lasting posi by a country mile! But you will have to get 28 spline axles to replace your 26 spline units in the 84. GM didn't start using 28 spline axles until late 1989 or so, so they aren't very common. However, Mosler makes them and they are about $250 US a pair.
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