Eaton rear axle - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69oldie · 02-23-2004, 05:58 PM

One more thing that I noticed that was missing in regards to these Eaton rear ends is:
1. The HO72 means 7,200 lbs. axle capacity and HO52 means
5,200 lbs. axle capacity. This difference is ONLY because size brake drums that where mounted to the axle housing it's self. There is NO difference in the actual axle housings. Depending on the year there was either 1/2" or 9/16" studs (note 1/2" stud doesn't automatically make it 3/4 ton rear end NOR does a 9/16" stud make it a 1 ton rear end!!!
So with this said, you could actually take a Eaton rear end coil sprung 3/4ton and make it a 1 ton by simply changing the brake drums (and backing plates) to the larger ones and have a 1 ton coil sprung Eaton rear axle. Just remember the coils would now Not match the newly found 2,000 lbs. capacity of the rear end!!
2. Two more problems with these rear ends that were not mentioned is:
A. The ring gear size is SMALL (About 10") and only has 10 bolts when compared to the Larger ring gear of the popular 14 bolt rear end (ranges from 10 1/2" - 12"!!). The 12" is found on Newer Chevy/GMC H.D. 2500's or 3500 with the 8.1 engines or Diesels Or All newer Dodges 3/4 -1 tons
B. The number of splines on the axle shafts (or lack of them). They have about half as many as the 14 bolt rear ends!

I actually prefer these axles though..............I like how they look and under the truck and I personally have never had a problem with them!!
Jim "69oldie"

**COBALT** · 02-23-2004, 06:05 PM

At Randy's Ring & Pinion site download their catalog: P. 27. Here's the snipet. If they don't carry them someone else will. Do a search on Yukon gears. At least this pic shows the part number...

1969 GMC · 02-23-2004, 07:12 PM

Quote:

Originally posted by 69oldie
2. Two more problems with these rear ends that were not mentioned is:
A. The ring gear size is SMALL (About 10") and only has 10 bolts when compared to the Larger ring gear of the popular 14 bolt rear end (ranges from 10 1/2" - 12"!!). The 12" is found on Newer Chevy/GMC H.D. 2500's or 3500 with the 8.1 engines or Diesels Or All newer Dodges 3/4 -1 tons

Actually, both axles have a 10.5" ring gear. The SF 14 bolt had a 9.5" ring gear.
And the newer 14 bolt that is in GM and Dodge trucks is a completely different axle, made for them by AAM. I don't believe parts from this interchange with the old style 14 bolt.

kiley · 02-23-2004, 07:42 PM

What's "Yukon"

**COBALT** · 02-23-2004, 07:53 PM

It's the manufacturer Randy's Ring & Pinion deals with. They make a 3.90 gear set for the HO52/72.

02-23-2004, 06:05 PM	#27
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	At Randy's Ring & Pinion site download their catalog: P. 27. Here's the snipet. If they don't carry them someone else will. Do a search on Yukon gears. At least this pic shows the part number... Attached Images __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

02-23-2004, 07:42 PM	#29
kiley Registered User Join Date: May 2003 Location: Keizer, OR Posts: 103	? What's "Yukon"

02-23-2004, 07:53 PM	#30
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	It's the manufacturer Randy's Ring & Pinion deals with. They make a 3.90 gear set for the HO52/72. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

02-23-2004, 05:58 PM	#26
69oldie Never too many LONGHORNS! Join Date: Dec 1999 Location: Los Angeles Calififornia Posts: 423	One more thing that I noticed that was missing in regards to these Eaton rear ends is: 1. The HO72 means 7,200 lbs. axle capacity and HO52 means 5,200 lbs. axle capacity. This difference is ONLY because size brake drums that where mounted to the axle housing it's self. There is NO difference in the actual axle housings. Depending on the year there was either 1/2" or 9/16" studs (note 1/2" stud doesn't automatically make it 3/4 ton rear end NOR does a 9/16" stud make it a 1 ton rear end!!! So with this said, you could actually take a Eaton rear end coil sprung 3/4ton and make it a 1 ton by simply changing the brake drums (and backing plates) to the larger ones and have a 1 ton coil sprung Eaton rear axle. Just remember the coils would now Not match the newly found 2,000 lbs. capacity of the rear end!! 2. Two more problems with these rear ends that were not mentioned is: A. The ring gear size is SMALL (About 10") and only has 10 bolts when compared to the Larger ring gear of the popular 14 bolt rear end (ranges from 10 1/2" - 12"!!). The 12" is found on Newer Chevy/GMC H.D. 2500's or 3500 with the 8.1 engines or Diesels Or All newer Dodges 3/4 -1 tons B. The number of splines on the axle shafts (or lack of them). They have about half as many as the 14 bolt rear ends! I actually prefer these axles though..............I like how they look and under the truck and I personally have never had a problem with them!! Jim "69oldie"



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