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06-13-2011, 12:59 AM
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#1 |
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Registered User
Join Date: Mar 2009
Location: NW, Colorado
Posts: 285
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Help ID Diff...
1970 Chevy PU long bed. I think a 3/4 ton. supposedly a stock diff. It has a large round rear cover with 10 bolts, but seemed way heavier duty than a 10 bolt. Had drum brakes, but the contact surface was pretty thin left to right. The fron of the diif and rear both unbolted to access pumpkin.
I have pics on my phone, but no way to get to computer. It so had 456 gears.
__________________
Confidence is the feeling we have before we fully comprehend the situation |
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06-13-2011, 02:04 AM
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#2 |
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Registered User
Join Date: Apr 2011
Location: Las Vegas, NV
Posts: 264
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Re: Help ID Diff...
Its either a eaton HO52 if its a C20 or a HO72 if its a C30. If you dont mind the low gear its not a bad rear. But if you want fuel econ then your gonna have to ditch it. They never made a gear taller than 4.10 for it.
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06-13-2011, 11:10 PM
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#3 | |
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Registered User
Join Date: Mar 2009
Location: NW, Colorado
Posts: 285
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Re: Help ID Diff...
Quote:
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Confidence is the feeling we have before we fully comprehend the situation |
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06-14-2011, 01:05 AM
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#4 |
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Registered User
Join Date: Apr 2011
Location: Las Vegas, NV
Posts: 264
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Re: Help ID Diff...
I wasnt aware that a 14 bolt carrier would fit it. Makes me a bit skeptical, but my dad has one in his '66 C20 and he is ditching it for a 14 bolt. They can be picked up for a song in junkyards cuz GM made so many and parts are cheap for em. In my opinion the Eaton rears arent bad, but its old tech. GM used them from '47-'72 so its definately dated.
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06-14-2011, 09:23 AM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Help ID Diff...
your worn drums are not avalible.... except from junk yards and places like this site that parts out old trucks.
If it is a 3/4 ton (coil springs maybe?) then it is an HO52, the HO72 (dam near the exact same thing) was only under c/30 trucks. it is a tough rock solid rear. but parts are getting hard to find. |
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06-14-2011, 01:40 PM
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#6 |
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Old Skool Club
 
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Help ID Diff...
Somewhere on the top of the axle housing, usually the right side, there will be a series of letters/numbers stamped on that tube. If you can read those, there's a way to decipher specifically what it is, ratio, etc., and I think you can also narrow the year down to one or two, in the translation.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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06-14-2011, 07:42 PM
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#7 |
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Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: Help ID Diff...
You got a HO-52 my friend...I got the same rear end in my C20 with 4.57's....The rear end is a HOSS....if you want a good rear end Id stick with it ....but yes if you keep the 4.57's in the gas mileage will not be the best...I get around 8...and im pushing around 4,000 RPM at 55 mph.
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06-14-2011, 10:47 PM
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#8 |
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Registered User
Join Date: May 2011
Location: Fort Collins, Colorado
Posts: 95
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Re: Help ID Diff...
Look at the front of rear end, if it has a bolt/lock nut on the driver side it is a H072.
They made some C20 with 1-ton rear ends, which I think they called "supper"....correct me I'm wrong here. |
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