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Unread 11-06-2013, 12:46 PM   #1
stvincnt
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1979 CJ5 
 
Join Date: Sep 2006
Location: s.florida
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Some AMC 20 questions

Recently my 79 cj5 slip down a boat ramp, Rear diff went under water (salt). A week later I was leaking brown sludge from my pinion seal ( which I replaced) and now I have a grinding noise coming from my right outer wheel bearing(I'm assuming the bearing got rusted and is now shot. I decided to take off the diff cover and had a retired mechanic friend look at it. I'm able to tackle the bearing but here are my questions. The hole (B) that has the cross shaft is going through seems kind of large and there is play in it, is this worn out and needs to be replaced or is that normal? (A) The holes that the cross shaft goes into the differential case seem to have a slight bit of wiggle in ithem,(less than 1mm and gear oil is seeping out, which seems logical)is that also normal, The spider gear also seem to have a bit of slop in them but by pinion and ring gear look healthy. I'm new to differentials and have been reading my butt off on the forum about them so any education is greatly appreciated, Thanks You
-Steven

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Unread 11-06-2013, 01:23 PM   #2
WindKnot
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1977 CJ7 
 
Join Date: Mar 2011
Location: Kaibab Plateau, Northern Arizona
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This is a link to the Factory Service Manual for 1976. The info and specs spelled out in section 10 is correct though for your year:

http://oljeep.com/edge_76_tsm.html

This is a link to a site that has all kinds of information for background on the AMC20. It might be useful for you just to browse:

http://www.jeeptech.com/axle/amc20.html
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Unread 11-06-2013, 01:32 PM   #3
JeepHammer
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1973 CJ5 
 
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Cross pin SHOULD NOT have any 'Wiggle' in it. Don't know if it's the pin that is shot, or the carrier holes, but either way it's going to misalign the Differential ('Spider') gears.

Just above your bottom arrow, you will see a pin hole that keeps the cross pin in the carrier.
Time to have a serious look at that pin and it's hole.
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Unread 11-06-2013, 05:41 PM   #4
jeepdaddy2000
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1971 CJ5 
 
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Quote:
Originally Posted by JeepHammer View Post
Cross pin SHOULD NOT have any 'Wiggle' in it. Don't know if it's the pin that is shot, or the carrier holes, but either way it's going to misalign the Differential ('Spider') gears.

Just above your bottom arrow, you will see a pin hole that keeps the cross pin in the carrier.
Time to have a serious look at that pin and it's hole.
X2
Cross shaft should be a slip fit with a slight drag. If the shaft is moving in the casing it will either shear the roll pin (retainer), allowing the shaft to come out and hang on the pinion or begin to slap in the casing, possibly splitting it. Either scenario will result in catastrophic failure.
The usual culprit is the casing wearing at the holes. If that is the case, then the only fix is to replace the carrier housing. The housing isn't very expensive, but you will need someone to get you through the proper procedures to R+R it.
Unless there is major movement in the carrier gears or wear on the thrust washers, I wouldn't worry about them.
As for the spacer (block on the shaft), it is designed to "float" on the cross shaft. The hole in the center is oval from the factory to allow it movement when adjusting the axle end play.
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