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Old 05-14-2018, 08:27 PM
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Rear axle swap
i have a 1985 camaro z28 with rear drum brakes i bought a 10 bolt with 3.73's non posi disc brake i wanna swap to the rear disc will it be as simple as just bolting it up with new brake lines can i keep the booster that is already in the car
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Old 05-14-2018, 09:02 PM
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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 axle swap
The FAQ About 10-Bolts, a sticky at the top of the page, will answer your questions. BTW, welcome to TGO.

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Old 05-14-2018, 10:15 PM
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Re: Rear axle swap
So is that 1le/j65 proportioning valve required to complete the swap and make the brakes work ??
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Old 05-14-2018, 11:59 PM
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Rear axle swap
How to Install a 4thgen Rear into your 3rdgen
https://www.thirdgen.org/4thgenrear/
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Old 05-15-2018, 05:34 AM
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Re: Rear axle swap
Their rear end is not out of a fourth gen its from a 1987 pontiac with disc
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Old 05-15-2018, 06:58 AM
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Car: Met. Silver 85 IROC/Sold
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Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Rear axle swap
Originally Posted by Blue85z28
So is that 1le/j65 proportioning valve required to complete the swap and make the brakes work ??
With Delco-Moraines on all four corners (J65), find a standard combination valve from an appropriate J65 car, from say 85-88 (to be safe).

EDIT: IIRC, 3.73's weren't available in 1987 from the factory, so verify what's there.

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Last edited by JamesC; 05-15-2018 at 07:10 AM. Reason: Additional Info
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Old 05-15-2018, 08:55 AM
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Re: Rear axle swap
Ya the ring gear is stamped 3.73’s might be aftermarket will the prop. Valve from flynbye work for this sawp ?
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Old 05-15-2018, 10:33 AM
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Axle/Gears: Limited Slip 3.23's
Re: Rear axle swap
For best brake performance, I'd suggest the standard valve, one specifically designed for the setup you intend. Though the 1LE and drum valve will work, the bias will be different and braking may suffer.

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Old 05-15-2018, 01:19 PM
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Re: Rear axle swap
do you know of a link on where i can purchase that prop valve or any idea where i can get one ?
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Old 05-15-2018, 02:14 PM
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Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Rear axle swap
Originally Posted by Blue85z28
do you know of a link on where i can purchase that prop valve or any idea where i can get one ?
Try bone yards or this site's classifieds. Who knows, you might get lucky at your dealership. By the way, make sure that the lines enter/exit where you current ones do and that the valve is alum (the cast iron one isn't a fit).

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Old 05-16-2018, 12:51 AM
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Re: Rear axle swap
what year and type of car would i be looking for ????
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Old 05-16-2018, 06:30 AM
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Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Rear axle swap
Any thirdgen 9- or 10-bolt (the braking system is the same) with four-wheel disc brakes (J65) from around 85 to 88 to be safe.

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