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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#39644 03/06/2004 6:52 AM | Joined: Jan 2001 Posts: 687 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 687 | Did Chevrolet make positive traction 12-bolt rear ends for half ton trucks from 1960-72? If so I'd LOVE to find a 3.73 posi-trac to replace my current 3.73 non-posi. It would be fun trying to spin 2 wheels with the 292. | | |
#39645 03/06/2004 6:59 AM | Joined: Feb 2004 Posts: 29,792 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,792 | Yes, the limited-slip center section was an option, and they're not too hard to find. There's a difference in the ring gear spacing depending on gear ratio, but I'm not sure where the break point is. Sevral aftermarket suppliers offer posi units, but they're pretty pricey. Try the JEGS catalog. They've got a couple of different brands of posi units, or a check with your local Chevy dealer's parts department will probably get you some info on the factory unit.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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#39646 03/06/2004 9:42 AM | Joined: Jun 2001 Posts: 85 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2001 Posts: 85 | I have an Eaton posi on the 12-bolt rearend of my '68 C/10. I think it came off a '69 GMC stepside. Eaton made the positraction axles for GM in that period. I had a differential shop rebuild my 12-bolt on a '67 K/10 Sub, the original axles wore out and for some reason I couldn't get GM parts. So I went with Moser custom alloy axles and an Auburn posi. Spendy, but results were good. Then, after I bought my '71 GMC [K/5] Jimmy, I was pleasantly surprized to find it had a factory (Eaton) posi.
The '68 C/10 pickup has a 292 and it works good with a posi.
Also all 3 trucks have 3.73 ratios. The Auburn I got from ProGear in San Diego.
Every 25 years I like to rebuild that 292 just for GP
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