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Old Today, 12:22 AM   #1
Luke87gt
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Join Date: Feb 2024
Location: Pleasanton CA
Posts: 211
Posi unit recommendation for 12bolt

Hi guys, I have a 69 c10 with 3.73 (i6) and starting to plan a removal and overhaul.

While I’m in there I’d like to upgrade to a posi unit.

Wondering what the popular ticket is these days? Eaton? Other?

I’m looking for something that will be comfortable on the street but strong /durable.

Thank you
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Old Today, 02:33 AM   #2
'68OrangeSunshine
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Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,290
Re: Posi unit recommendation for 12bolt

About the Mid-Ninties I had the 12-Bolt 3.73 rear end go out on my '67 K/10 Suburban. It had a 454/TH350/NP205/3.73 drivetrain. Bearings went out after unknown mileage. A PO had already used Bearing Savers.
I had the whole carrier rebuilt. Moser axles, since I couldn't get OEM 6-lugs bc the plant had a strike going with the UAW. I went with an Auburn Posi. I spent around a thousand 30 years ago. The Sub had an engine fire [ '98] and a big insurance company totalled it for me and I got a Salvage Title. So it sat. In 2010, the stock Eaton posi on my K/1500 GMC Jimmy, broke, trying to pull a deadbeat's Scouts off my property.
We cannibalized the whole rear end off the '67 Suburban and bolted it on the '71 Jimmy.
I know the widths differ between the years. Somehow, we got the skinnier '67 carrier under the '71 chassis. Putting the '71's carrier under the '67 chassis didn't work. It's still on jacks.
But the point is I've had real good luck with my Auburn. It's run on two trucks. You can't rebuild them, they say. Eatons are good too, and rebuildable. But I haven't had to rebuild an Auburn.
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Every 25 years I like to rebuild that 292, whether it needs it or not.
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