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Old June 19th, 2012, 11:13 PM   #1
llxRanger
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Default I get lost in axles. ***UPDATED***

I have a 1985 CJ7. It has the B-Code AMC 20 Wide Track which I believe is the 3.31. The rear end I believe is bad. I don't know what is bad or what could go bad. I am looking at like 300 bucks for a used one. Is it smarter/cheaper to rebuild the one I have. If so how hard is it to rebuild a rear end? Thanks for not flaming...

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Old June 19th, 2012, 11:47 PM   #2
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Put full widths under it and wheel her to death. My .02
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Old June 20th, 2012, 07:01 AM   #3
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I have a 1985 CJ7. It has the B-Code AMC 20 Wide Track which I believe is the 3.31. The rear end I believe is bad. I don't know what is bad or what could go bad. I am looking at like 300 bucks for a used one. Is it smarter/cheaper to rebuild the one I have. If so how hard is it to rebuild a rear end? Thanks for not flaming...
Its not hard with the proper tools and know how.......but........if you need to overhaul the axle you will probably have more in to parts
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Old June 20th, 2012, 02:37 PM   #4
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I don't know what is bad or what could go bad.
What makes you think it's bad?
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Old June 20th, 2012, 02:44 PM   #5
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I have a 1985 CJ7. It has the B-Code AMC 20 Wide Track which I believe is the 3.31. The rear end I believe is bad. I don't know what is bad or what could go bad. I am looking at like 300 bucks for a used one. Is it smarter/cheaper to rebuild the one I have. If so how hard is it to rebuild a rear end? Thanks for not flaming...
What is the point of changing it if you don't even know its bad? Do a little testing and figure out the problem, it may be a super easy fix. What makes you think the used one you would put in there doesn't have any little issues that you will need to fix also? Throwing random parts at something is never a smart economical idea.
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Old June 20th, 2012, 03:14 PM   #6
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Or you can put full widths under it and wheel the piss out of it?!?
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Old June 20th, 2012, 03:16 PM   #7
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Or you can put full widths under it and wheel the piss out of it?!?
Hey rainman, everybody heard you the first time.
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Old June 20th, 2012, 03:18 PM   #8
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And no its not hard to rebuild it...did a few now, no biggie, actually did my first one in high school, after my buddy slammed his car into 1000 yards of chain-link fence at 120mph...need less to say the axle was whooped and we still got it back together and it's still driving from east Lansing to alpena pretty regularly...
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Old June 20th, 2012, 03:18 PM   #9
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Hey rainman, everybody heard you the first time.
Making sure he didn't miss it.
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Old June 22nd, 2012, 09:14 AM   #10
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What makes you think it's bad?
I purchased it with the bad "Rear-End". How would I go about testing to see if it is the rear end? It drives fine in 4X4. But in 2 wheel theres nothing. Could it potentially be the T-Case?
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Old June 22nd, 2012, 09:19 AM   #11
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Pull the rear cover and you will most likely find a bunch of broken parts.
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Old June 22nd, 2012, 09:33 AM   #12
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^x2, pull the cover and see what you got. if you are lucky it will just be bad spider and side gears. (there will be 4 gears in the center of the carrier unless it has a locker of some sort) if those are bad it is an easy replacement, just make sure to inspect your ring and pinion to make sure they dont have any chipped teeth from the chunks floating around. i would pull the cover and see what you have before you drive it around in 4x4 any more, if the r&p are still good you dont want to run any chunks through them.
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Old June 22nd, 2012, 09:39 AM   #13
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Does it have a rear drive shaft?
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Old June 22nd, 2012, 10:00 AM   #14
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pull the cover, drain the oil, snap some decent pictures and post them up to get some troubleshooting help. Also, does the pinion wiggle side to side from the universal, do the hubs on the axle move around, is there excessive noise comming from the differential? these questions and pictures will all help aide in finding a cost effective solution.
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Old June 23rd, 2012, 07:49 AM   #15
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It is a amc model 20, I would bet it broke an axle shaft. I would lok there first.
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Old June 23rd, 2012, 08:15 AM   #16
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$300 for a AMC 20? Pm dmcjeep, he can beat that price big time! Hell i have seen them here for free...
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Old June 23rd, 2012, 10:29 AM   #17
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pull the cover, drain the oil, snap some decent pictures and post them up to get some troubleshooting help. Also, does the pinion wiggle side to side from the universal, do the hubs on the axle move around, is there excessive noise comming from the differential? these questions and pictures will all help aide in finding a cost effective solution.
This is the proper response. Plus the question about does it have a rear drive shaft.

Depending on what is wrong, your budget and intended usage will determine what to do. Just simply saying throw a different axle under it without knowing what is wrong is just plain stupid.

Find the problem.
Asses damages.
Determine course of action.
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Old June 23rd, 2012, 10:52 AM   #18
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This is the proper response. Plus the question about does it have a rear drive shaft.

Depending on what is wrong, your budget and intended usage will determine what to do. Just simply saying throw a different axle under it without knowing what is wrong is just plain stupid.

Find the problem.
Asses damages.
Determine course of action.
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Old June 23rd, 2012, 11:52 AM   #19
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You are so shallow.
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Old June 24th, 2012, 02:28 PM   #20
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Drive shaft is there in tact. Exactly what was explained to me was that it was making a strange sound for a few weeks, he stopped at the gas station on his way from work. When he got in it to drive the rest of the way home it wouldn't go anywhere. He drove it home from the gas station in 4 Hi, 4 miles and parked it. It's been sitting since. I havn't had time to pull the diff cover I think I will get into that this week.
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