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Old 09-20-2017, 12:58 PM   #1
Maggro
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Differential

Can anyone help me identify what differential this is.
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Old 09-20-2017, 01:12 PM   #2
polishspy
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Re: Differential

That is an eaton 10 bolt rear end. It has an open differential. They used to make lockers for it but they stopped many years ago. If you have a 4x4 i would swap it for something you could put a posi unit in like a GM 14 bolt.
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Old 09-20-2017, 01:26 PM   #3
Bigdav160
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Re: Differential

A detroit locker was available from the factory for the Eaton. If equipped, it's probably on the SPID.

I believe the OP has a '69 2WD 3/4 ton
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Old 09-20-2017, 02:13 PM   #4
Maggro
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Re: Differential

Wow you are good, any idea what the gear ratio is on this. It's not to good on the highway and I would like to regear if possible.
Thanks for the info guys

Last edited by Maggro; 09-20-2017 at 02:21 PM.
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Old 09-20-2017, 03:14 PM   #5
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Re: Differential

1972 ended the use of the Eaton HO52 axle in GM vehicles. It was only available in 4.11 and 4.56:1 ratios. I don't believe there are any aftermarket gearsets.

Your best choice would be convert to an overdrive transmission for better drivability.

In my Suburban, I installed a '75 GM corporate 14 bolt with a 3.73:1 gear and a 700R4 overdrive transmission.

Perhaps not the greatest combination for performance but it works well for me.
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