Need help identifying rear end... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevelle454 · 06-23-2007, 08:55 PM

1972 C20 Chev

The numbers on my rear axel are 3934635

Can anyone tell me what rear this is? I bought two pinion seals from the auto parts store and they are both too small...

**kwmech** · 06-23-2007, 09:40 PM

Do you have a dana 60 or an eaton ho52? The eaton will have a rear cover that is completely round and would look like a bowl if removed

Longhorn Man · 06-23-2007, 10:42 PM

Quote:

Originally Posted by kwmech

Do you have a dana 60 or an eaton ho52? The eaton will have a rear cover that is completely round and would look like a bowl if removed

This is the eaton.

Chevelle454 · 06-24-2007, 12:37 AM

Yes, it is the Eaton HO52 it looks like. Are these strong axels?

**kwmech** · 06-24-2007, 01:05 AM

I come up with a napa number 25970 which fits both the 52 and the 72

Chevelle454 · 06-24-2007, 01:31 AM

Another question... I took the pinion nut off (what a pain) and now I am wondering what torque to put it back on. I have searched the site and have come up with anywhere between 175-400 ft lbs for the ho52. Am I correct in assuming that I can put the nut on 175 lbs and put the cotter pin in and be done with it?

Scott

Chevelle454 · 06-24-2007, 01:50 AM

I was also unaware the nut had to be marked what position it was in, but I have a general idea...am I screwed? Please say no...lol

Chevelle454 · 06-24-2007, 09:14 AM

ttt

larry may · 06-24-2007, 09:39 AM

no you are not scrd, Re in stall the nut to 175 then mark that spot. with a small punch. Turn the nut additional 1./8 th turn past the mark. Should be about 3-3-1/2 threads out in front of the nut. Ball park figure there. Never seen one of these with a cotter key. May want to set the nut by punching a couple of places around the shaft and nut to keep it from working its way off. or use some locktite. my.02% keep the faith

Chevelle454 · 06-24-2007, 10:09 AM

Yes, it has a cotter pin. It's set up pretty much like a set of front wheel bearings on a rwd car from what I can tell. Bearing on the inside I can't get to, then one toward the outside, then a washer, castle nut and pin...

larry may · 06-24-2007, 11:21 AM

in that case turn the nut past the punch mark to the next spot for the insertion of the cotter key.

06-23-2007, 08:55 PM	#1
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Need help identifying rear end... 1972 C20 Chev The numbers on my rear axel are 3934635 Can anyone tell me what rear this is? I bought two pinion seals from the auto parts store and they are both too small... __________________ 1972 C10 1972 C20

06-23-2007, 09:40 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,499	Re: Need help identifying rear end... Do you have a dana 60 or an eaton ho52? The eaton will have a rear cover that is completely round and would look like a bowl if removed

06-24-2007, 12:37 AM	#4
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Need help identifying rear end... Yes, it is the Eaton HO52 it looks like. Are these strong axels? __________________ 1972 C10 1972 C20

06-24-2007, 01:05 AM	#5
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,499	Re: Need help identifying rear end... I come up with a napa number 25970 which fits both the 52 and the 72

06-24-2007, 01:31 AM	#6
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Need help identifying rear end... Another question... I took the pinion nut off (what a pain) and now I am wondering what torque to put it back on. I have searched the site and have come up with anywhere between 175-400 ft lbs for the ho52. Am I correct in assuming that I can put the nut on 175 lbs and put the cotter pin in and be done with it? Scott __________________ 1972 C10 1972 C20

06-24-2007, 01:50 AM	#7
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Need help identifying rear end... I was also unaware the nut had to be marked what position it was in, but I have a general idea...am I screwed? Please say no...lol __________________ 1972 C10 1972 C20

06-24-2007, 09:14 AM	#8
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Need help identifying rear end... ttt __________________ 1972 C10 1972 C20

06-24-2007, 09:39 AM	#9
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: Need help identifying rear end... no you are not scrd, Re in stall the nut to 175 then mark that spot. with a small punch. Turn the nut additional 1./8 th turn past the mark. Should be about 3-3-1/2 threads out in front of the nut. Ball park figure there. Never seen one of these with a cotter key. May want to set the nut by punching a couple of places around the shaft and nut to keep it from working its way off. or use some locktite. my.02% keep the faith __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2

06-24-2007, 10:09 AM	#10
Chevelle454 Registered User Join Date: Aug 2003 Location: MN Posts: 380	Re: Need help identifying rear end... Yes, it has a cotter pin. It's set up pretty much like a set of front wheel bearings on a rwd car from what I can tell. Bearing on the inside I can't get to, then one toward the outside, then a washer, castle nut and pin... __________________ 1972 C10 1972 C20

06-24-2007, 11:21 AM	#11
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: Need help identifying rear end... in that case turn the nut past the punch mark to the next spot for the insertion of the cotter key. __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2



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