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Jan 21st, 2020
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 Eaton HO52/HO72 Differences
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Joined: Nov 2000
Posts: 2,014
OP
Shop Shark
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I know they were made and used from 48 — 72 (and maybe other years) in 3/4 and 1 ton trucks. Really not too much in the 48-51 Shop Manual to explain the differences. In fact, the Chevy manuals don’t identify them as HO-anything or as Eaton. And do those designations apply to the entire axle assembly or just the differential?
Thanks
Professional Novice
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Re: Eaton HO52/HO72 Differences
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Joined: Mar 2008
Posts: 2,003
Shop Shark
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After years of debate, the biggest difference I've seen is in the brakes. The 3800 trucks had 14", the 3600 trucks had 12". There may be some differences in the carrier assemblies, but they are interchangeable, so kind of a non issue.
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Re: Eaton HO52/HO72 Differences
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Joined: Nov 2000
Posts: 2,014
OP
Shop Shark
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Thanks. That’s about what I thought.
Professional Novice
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Re: Eaton HO52/HO72 Differences
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Joined: Mar 2019
Posts: 1,142
Shop Shark
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Axles swap also, if you were wondering.
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Re: Eaton HO52/HO72 Differences
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Joined: May 2001
Posts: 1,562
Shop Shark
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I was trying to sell my 4.57 pumpkin. I advertised it as an HO52. A guy said he needed an HO72. So there's basically no difference. He thought the HO72 was stronger. Not so?
1948 3/4-Ton 5-Window Flatbed Chevrolet [ sandeace.com] 28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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Re: Eaton HO52/HO72 Differences
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Joined: Jun 2005
Posts: 228
Shop Shark
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Some people think the H072 has the load bolt that keeps the ring gear from deflecting and the H052 doesn't, but I've seen them both ways. If you have some time and want to learn about these axles, read this thread https://www.pirate4x4.com/threads/eaton-h072.771317/Lots of good info in there
'66 c10 rust bucket, 350 nv4500 stock bellhousing, '85 c30 front suspension, h072 rear axle with 3/4 ton rear coil springs
'67 cj5 225 oddfire motor, time for disc brake conversion, offset rear dana 44, intermediate pedals and steering upgrade
'48 3804 frame and bed + '52 6400 cab and front clip + 4bt, need to put them together
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Re: Eaton HO52/HO72 Differences
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Joined: Nov 2000
Posts: 2,014
OP
Shop Shark
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Professional Novice
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Re: Eaton HO52/HO72 Differences
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Joined: Dec 2015
Posts: 300
Unconventional Thinker
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I read today over on the 67-72 site, a portion of an HO52/HO72 axle thread, and there are some 14 bolt FF parts that can be interchanged on these axles. One of them is a lunch box locker for the 14B, it will install into the HO Carrier. The main thing I was looking for was that orientation of HO52 diff cover, whether the fill hole was low or high, since these covers can be installed either way. I questioned whether mine was installed properly because. Checked the book, it said 6.5 pints, and I had poured in 3.25 quarts, so that was right, but the level of the oil appears to be lower than the axle tubes. I figured since the amount of oil I poured in matched what the book said it takes, then GM knew what they were doing by having the oil level lower than the tubes.
Shane
Shane's Toys...
2007 Forester XT Limited (2nd Owner)
1991 Cherokee Laredo (2nd Owner)
1981 Chevy 3/4 Ton Fleetside 8,600 Camper Special (3rd Owner)
1965 Chevy 3/4 Ton Fleetside (3rd Owner)
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