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Old Today, 12:22 AM   #1
Luke87gt
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Join Date: Feb 2024
Location: Pleasanton CA
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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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Location: Tucson, AZ USA
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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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Old Today, 09:15 AM   #3
WorldsCrappiestTruck
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Join Date: Mar 2022
Location: Hinesburg Vermont
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Re: Posi unit recommendation for 12bolt

I did an Eaton TrueTrac a few months ago - pleased with it so far.
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Old Today, 10:12 AM   #4
truckster
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Location: Orem, Utah
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Re: Posi unit recommendation for 12bolt

I'm very happy with my TrueTrac. I forget it's there until it's needed and then it does its thing without any problem.
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Old Today, 10:45 AM   #5
A1971Blazer
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Location: East Tennessee
Posts: 2,158
Re: Posi unit recommendation for 12bolt

Another vote for the TrueTrac, it's probably the most street friendly unit. No need for friction modifiers like the clutch type. I have them in two of my trucks.
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Old Today, 12:46 PM   #6
72SB
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Location: Moorpark, CA
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Re: Posi unit recommendation for 12bolt

Go Eaton, not Auburn.

If you are switching to higher gear ratio, you will need a different carrier size than the 3:73 IIRC
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