Help with rear end identification....Eaton HO72? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72timemachine · 03-12-2015, 12:08 PM

I did some research and was wondering if I am correct about this 1969 dually rear end being an Eaton HO72. They say the difference between the HO72 and HO52 is the load bolt at the front of the unit which looks like a some type of adjusting nut.

It is in what is left of his C-30 cab/chassis truck, 350/th400.

Thanks for any help.

SS Tim · 03-12-2015, 04:27 PM

Sure looks like a H072. But load bolts were used on both H052 and H072 axles. Up on the top flange face, the axle code will be stamped in. That would verify original application and ratio.

Longhorn 70 · 03-12-2015, 05:22 PM

Yup. My HO52 has the load bolt too.

There is a good rear end post HERE

65standard · 03-12-2015, 07:53 PM

I thought the difference between the two was in the spider gears?

SS Tim · 03-12-2015, 09:48 PM

Get the code off the axle carrier then decide if it will work for you.
My guess is its a 4.57
They are very rugged axles and generally don't need a lot of parts.

**special-K** · 03-13-2015, 09:52 AM

To keep this simple, if it's a dual wheel rear in a C/30 it is most definitely an HO72.

03-12-2015, 12:08 PM	#1
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 220	Help with rear end identification....Eaton HO72? I did some research and was wondering if I am correct about this 1969 dually rear end being an Eaton HO72. They say the difference between the HO72 and HO52 is the load bolt at the front of the unit which looks like a some type of adjusting nut. It is in what is left of his C-30 cab/chassis truck, 350/th400. Thanks for any help. Attached Images

03-12-2015, 04:27 PM	#2
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Help with rear end identification....Eaton HO72? Sure looks like a H072. But load bolts were used on both H052 and H072 axles. Up on the top flange face, the axle code will be stamped in. That would verify original application and ratio. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-12-2015, 05:22 PM	#3
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: Help with rear end identification....Eaton HO72? Yup. My HO52 has the load bolt too. There is a good rear end post HERE Attached Images __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9

03-12-2015, 07:53 PM	#4
65standard Registered User Join Date: Dec 2014 Location: Coal City, IL Posts: 695	Re: Help with rear end identification....Eaton HO72? I thought the difference between the two was in the spider gears? __________________ Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker

03-12-2015, 09:48 PM	#5
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Help with rear end identification....Eaton HO72? Get the code off the axle carrier then decide if it will work for you. My guess is its a 4.57 They are very rugged axles and generally don't need a lot of parts. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-13-2015, 09:52 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Help with rear end identification....Eaton HO72? To keep this simple, if it's a dual wheel rear in a C/30 it is most definitely an HO72. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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