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02-28-2010, 12:03 AM
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#1 |
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Registered User
Join Date: Sep 2009
Location: Glasgow,Ky
Posts: 24
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Rear Diff Identification
Today I just purchased a 71 3/4 ton 4wd truck. The body is pretty much worthless so all the drivetrain under it is going to be donated to a 70 CST/10 I recently purchased that needs a frame under it. The question I have is that I cannot ID the rear diff. It is not a corporate 14 bolt. It has a removeable rear cover, but the chunk or punkin is also removable. It is 8 lug. Any one have an idea of what it is?
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02-28-2010, 12:23 AM
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#2 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,533
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Re: Rear Diff Identification
Might be an Eaton HO52 (corporate) -- tough as nails, kinda hard to find parts for. I'll try to find a pic.
Edit: a few pics in this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=384742 and another
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 02-28-2010 at 12:30 AM. |
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02-28-2010, 12:36 AM
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#3 | |
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Registered User
Join Date: Sep 2009
Location: Glasgow,Ky
Posts: 24
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Re: Rear Diff Identification
Quote:
Is that a rare diff under these trucks? I have done alot of searching and was not able to find anything on it so I decided to ask. Thanks Stocker! |
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02-28-2010, 12:44 AM
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#4 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,533
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Re: Rear Diff Identification
It was fairly common under 8-lug trucks, but I think 1972 was the last year it was used. Also, I believe 4:10 was the highest gear ratio -- it also came with 4:56 gears, and maybe one lower.... might be 5:13s, but I'm not at all sure about that. Limited-slip units for those are hard to find and expensive.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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02-28-2010, 12:51 AM
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#5 |
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Registered User
Join Date: Dec 2008
Location: highland village, TX
Posts: 309
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Re: Rear Diff Identification
Shots of my '71 GMC 3/4 ton 4x4...Dana 60
Note the "60" in the lower right of the pics. |
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02-28-2010, 01:05 AM
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#6 |
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Registered User
Join Date: Sep 2009
Location: Glasgow,Ky
Posts: 24
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Re: Rear Diff Identification
OK, curiosity got the best of me, so I grabbed a flashlight and went out back to take a peek at it. Based on the pics, it is a 10 bolt eaton HO52.
Thanks everyone for the help. |
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02-28-2010, 02:03 AM
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#7 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,533
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Re: Rear Diff Identification
Some guys change them out if they need work (or brake drums). Mine is still working fine. Years ago it developed slight pitting on the pocket bearing (of the pinion). The bearing was available at NAPA.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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02-28-2010, 12:31 PM
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#8 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear Diff Identification
they are as common as parking lot gravel under the 20 and 30 series trucks till 72. Very solid and strong rear end, but parts are getting hard to get, and some were dicontinued many many years ago.
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02-28-2010, 03:38 PM
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#9 |
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Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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Re: Rear Diff Identification
If you look at the hubs the top picture is a H072 and the bottom is a dana60. H052 is similar to the H072.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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02-28-2010, 06:14 PM
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#10 |
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Registered User
Join Date: Sep 2009
Location: Glasgow,Ky
Posts: 24
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Re: Rear Diff Identification
Definately a HO52. I will have to tear into it to see if it is worth keeping on the truck or not.
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