Transmissions and Drivetrain Need help with your trans? Problems with your axle?

7.5 or 7.65 rear end???

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Old 04-11-2006, 09:36 PM
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Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
7.5 or 7.65 rear end???

My RPO codes for my 86 IROC tell me

1) GU5 - 3.23 axle ratio
2) G80 - limited slip rear

My question is do I have 7.5 or 7.65 rear? Or does it even matter? Also, do I have a series 2 or 3 carrier? How can I tell? What would my spline count be?I'm new to playing with rear end gears and what not so I'm not sure what all to look for.
Old 04-12-2006, 03:57 AM
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ede
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7.5/7.62 are the same, 26 spline, series depends on the ratio
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