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Eaton HO52/HO72 Differences
#1373551 Sun Aug 16 2020 01:30 AM
Joined: Nov 2000
Posts: 1,968
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Frank50 Offline OP
Shop Shark
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
Re: Eaton HO52/HO72 Differences
Frank50 #1373621 Sun Aug 16 2020 06:00 PM
Joined: Mar 2008
Posts: 1,988
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Shop Shark
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.


1954 3600 Chevy Truck
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Re: Eaton HO52/HO72 Differences
Frank50 #1373849 Mon Aug 17 2020 11:13 PM
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Frank50 Offline OP
Shop Shark
Thanks. That’s about what I thought.


Professional Novice
Re: Eaton HO52/HO72 Differences
Frank50 #1373856 Mon Aug 17 2020 11:37 PM
Joined: Mar 2019
Posts: 1,029
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Shop Shark
Axles swap also, if you were wondering.

Re: Eaton HO52/HO72 Differences
Frank50 #1373925 Tue Aug 18 2020 02:34 PM
Joined: May 2001
Posts: 1,524
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Shop Shark
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.
Re: Eaton HO52/HO72 Differences
Frank50 #1373990 Wed Aug 19 2020 12:17 AM
Joined: Jun 2005
Posts: 227
W
Shop Shark
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
Re: Eaton HO52/HO72 Differences
Frank50 #1374190 Thu Aug 20 2020 08:45 PM
Joined: Nov 2000
Posts: 1,968
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Frank50 Offline OP
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Thanks all.


Professional Novice
Re: Eaton HO52/HO72 Differences
Frank50 #1374957 Wed Aug 26 2020 09:15 PM
Joined: Dec 2015
Posts: 247
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Unconventional Thinker
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.


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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