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Jul 21st, 2025 | | | | Joined: Apr 2010 Posts: 24 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 24 | Just bought a 1965 3/4 ton 4x4 rolling chassis and would like to know what rear differential it has. Who makes it? It has a third member drop out on the front of the housing and a 10 bolt round cover on the rear of the housing. 8 lug. Also does anyone know off hand what ratios they came with? The front diff. still has the tag attached and it has 4.55 stamped into it. Is this the ratio?
Thanks!
Last edited by 64c10k20; 10/31/2010 5:28 AM.
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Rear diff is an Eaton HO52, most likely with the 4.56 gear. Options are very limited, there are no aftermarket gearsets for that differential. Using OEM parts, the other choices are the 4.10 from the '68-'72, or the 5.13 from the 1 tons. Your front diff should be a closed knuckle Spicer 44, 4.55 would be the ratio.
Bill Burmeister
| | | | | Joined: Apr 2010 Posts: 24 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 24 | Thanks!
I have also heard that it could be an HO72? What is the difference? | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | HO72 was the 1 ton version of the HO52. 3rd member is the same other than gear ratio, main difference is larger brakes on the HO72.
Bill Burmeister
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