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

Rear end questions

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Old Jul 16, 2011 | 09:58 AM
  #1  
jminton's Avatar
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Joined: May 2005
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From: Willow Spring, NC
Car: 1985 IROC
Engine: 305 4bbl H.O.
Transmission: WC T-5
Axle/Gears: 3.73
Rear end questions

I have a 1987 with an automatic. I have been looking for the correct rear end size, but I can't tell whether it is a 7.5, 7.625 or 7.75. It is a base coupe with 2.73 gears stock. Any help is appreciated.
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Old Jul 16, 2011 | 10:13 AM
  #2  
DJP87Z28's Avatar
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Joined: Mar 2003
Posts: 4,771
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From: Florida
Car: 1987 Black IROC-Z (SOLD)
Re: Rear end questions

7.5 & 7.625 are 10-bolts and are interchangeable....7.75 is a 9-bolt. Also the 2:73 ratio is 2-series 10-bolt (7.5/7.625) dia.
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Old Jul 16, 2011 | 10:55 AM
  #3  
JamesC's Avatar
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Rear end questions

https://www.thirdgen.org/forums/tran...-10-bolts.html

If you have a 10 bolt, check the above.

JamesC
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