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

12 bolt disc brakes

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Old 11-23-2010, 03:25 PM
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Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
12 bolt disc brakes

I obtained a 12 bolt from a 70 chevelle with 4.11 posi gears for too good of a price to turn down. From what I can tell, length wise its very close to swap in. I can swap the spring perches no prob and am going to fab up modified 4 link also to eliminate the torque arm. One thing I cant find out easily is if my factory disc brakes will swap over to this rear end. I did find out that the conversion kits out there work with both 10 and 12 bolts, so there must be similarities at the least.
Old 11-23-2010, 05:07 PM
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Re: 12 bolt disc brakes

The housing ends on all of the 8.2, 8.5, 12 bolt and many 7.5 Chevy car rear ends are the same, except for the full size cars.
Old 11-23-2010, 05:19 PM
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Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: 12 bolt disc brakes

yeah they call the 7.5/7.6 ends small ends.. if it has the small ends they should bolt up fine
Old 11-23-2010, 05:27 PM
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Re: 12 bolt disc brakes

The 7.5 had 2 different ends. The late '70s through the '80s they had a triangle shaped brake flange that used 3 bolts to hold the backing plates. Then they went to the standard 4 bolt flange, which is the same as all of the other rear ends. They all use the same axle bearings and seals.
Old 11-23-2010, 06:04 PM
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Re: 12 bolt disc brakes

Yes, the third gen disc brakes bolt up.
Old 11-23-2010, 07:04 PM
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Car: 87 monte aerocoupe
Engine: 383 HSR w/ novi 2000
Transmission: Built 4l80e circle d converter
Axle/Gears: Currie 9" 3.89 gears
Re: 12 bolt disc brakes

sweet, thanks everyone for the help, much appreciated. Now, on to the hard part of putting it in, but at least that wont be until spring.
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