12 Bolt Rear Truck/Car Question !!! - Team Camaro Tech
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post #1 of 6 (permalink) Old Mar 28th, 00, 07:41 AM Thread Starter
Join Date: Feb 2000
Posts: 18

hey guys...help me out

will a 12 bolt center section only from a 72 Chevy truck rear axle fit in and function properly in a 69 Camaro 12 bolt housing?

I figure the axles are different and i think the pinion diameter is too, but will the center section interchange with no problems with splines, etc..? I find a whole lot more truck parts than Camaro parts, so I may be missing some posi chunks here. thanks

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post #2 of 6 (permalink) Old Mar 28th, 00, 02:08 PM
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Location: Talking Rock, Ga. U.S.A.
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Some say they can make them work, but I haven't seen their setup, so I don't know if they will.The axle and spider gears are the same for a truck and car, as long as they are 30 spline. They are 10/18 gears, with the 18 being the splined gears for the axles. That's why my wanted ad includes truck posi's.Also the 2 series car posi units use the same internals, so if you find one of those, you can use it for parts, and put it in a 3 or 4 series car case. The car #'s to look for are # 140 for a 3 series, and a #174 for a 4 series.

[This message has been edited by Doug Garland (edited 03-28-2000).]
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post #3 of 6 (permalink) Old Mar 28th, 00, 02:26 PM
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There may be some common parts such as bearings, seals, and some other misc. parts but the carriers are not interchangeable.

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post #4 of 6 (permalink) Old Mar 28th, 00, 03:26 PM
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I had a friend about 7 years ago that had purchased a 3.73 12 bolt posi. rear end from an older Chev. P/U for his '62 Nova. He had the rear end narrowed slightly and welded on the perches. The rear end worked great in his car. BTW, he got this unit on a $25 all you can carry special out of a bone yard. That was more than he could carry, but he wanted that rear end real bad.

Just my .02.............

[This message has been edited by BelgianSS (edited 03-28-2000).]
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post #5 of 6 (permalink) Old Mar 28th, 00, 06:34 PM
David Pozzi
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The hollander interchange says it won't swap.
It lists different units for car and truck.
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post #6 of 6 (permalink) Old Apr 2nd, 00, 01:34 PM
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Location: Ramsey, MN, USA
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The reason a car and truck 12 bolt posi unit will not interchange is the location of the ring gear mounting surface. They are different, so even if you bolted up the car gears to a truck posi, you can't get the ring gear and pinion gear to mate up correctly. They won't work.

70 & 1/2 RS
SB406 & M20 4spd
9" rear

70 Malibu 350/TH400

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