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10-04-2017, 03:19 AM
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#1 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Looking at used rear end
What do I need to check? I will pull diff cover (or I will walk) and check for chipped teeth and metal filings. How much rust is too much? How to check wear and how much is too much? I plan on replacing bearings and seals on whatever I get before I install.
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10-04-2017, 08:10 AM
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#2 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Looking at used rear end
I will pull diff cover (or I will walk) Yep...no exceptions...
and check for chipped teeth and metal filings. Any chips or filings, run, dont walk... How much rust is too much? Any signs of rust...run, dont walk... How to check wear and how much is too much? ...Look for burned up surfaces that mesh...any signs of "blue"...run dont walk.... I plan on replacing bearings and seals on whatever I get before I install...great idea...also check pinion yolk seal surface for grooves where seal runs...you can repair any groove with a slip on sleeve.... Have fun... 
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10-04-2017, 08:49 AM
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#3 |
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Senior Member
 
Join Date: Jun 2002
Location: Murray, Kentucky
Posts: 3,514
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Re: Looking at used rear end
Actually, I would say rust on the inside is bad, not so much on outer areas, otherwise I'd never drive my truck!
__________________
Roger '68 Short step - https://67-72chevytrucks.com/vboard/...d.php?t=849675 '69 ('70?) 2wd Blazer '70 GMC Jimmy 2wd '73 Firebird - https://67-72chevytrucks.com/vboard/...d.php?t=853203 Ideas - https://67-72chevytrucks.com/vboard/...d.php?t=851743 |
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10-04-2017, 07:29 PM
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#4 |
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Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Looking at used rear end
Yep...external rust is not usually a concern...unless this is a trailer queen,,, where perfect paint and finish is an absolute requirement.
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10-05-2017, 12:39 PM
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#5 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,393
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Re: Looking at used rear end
Don't forget to check the pinon shaft for play, forward & aft, up & down. Take a ruler or calipers check the bolt pattern on the axles. And check the axle flanges to see if the axle is bent. Check the yoke for damage and if it is the treaded clamp style check the threads. If you can bring a long straight edge to check the housing for straightnesss.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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10-05-2017, 03:22 PM
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#6 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,411
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Re: Looking at used rear end
Things to look for
Color of oil, dark black, looking like it's never been changed. Oil should be brownish, able to see into it, not like it was a solid. Take a small magnet, run it through the fluid, see if anything is on the end. It's not easy to check housing straightness... Look for a small contact patch on the ring gear, kinda like a long oval shape, maybe 1-1/2" long. Centered on the middle of the gear tooth. Preferable the spot will be in the center of the tooth, better is closer to the inside of the tooth. If the spot is close to the outside of the gear tooth, that is the least desirable. But that could work depending on how the gears were set up. You never know. |
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