amc 20 from '78 CJ fit in my '83 CJ? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 03-05-2006, 08:06 AM   #1 (permalink)
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amc 20 from '78 CJ fit in my '83 CJ?

The rear end locked up in my '83 CJ-5, I found a '78 CJ rear axle local for a bill. What's the difference? I've been told my '83 is narrow track and the '78 is a widetrack? If that's the difference, can I pull the chunk out of the '78 housing and put it in my '83 housing? Thanks
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Old 03-05-2006, 08:12 AM   #2 (permalink)
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Actually, that would be completely backwards. Jeep switched to widetrack axles in '82 (if memory serves) but the CJ-5 never got the widetrack axles from the factory. The 78 will be a narrowtrack (assuming its original) and should be a direct swap in to your '83.
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Old 03-05-2006, 08:12 AM   #3 (permalink)
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your 83 is a wide track the 78 is a narrow track. if both are amc 20's the chunk should interchange tho
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Old 03-05-2006, 07:45 PM   #4 (permalink)
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might want to check gear ratios too.
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Old 03-05-2006, 07:54 PM   #5 (permalink)
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CJ5's never got a wide track from the factory!!!

so if yours is factory it is the same width as the 78...... jsut maek sure the gears are the same or you wont have 4wd
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Old 03-06-2006, 07:47 AM   #6 (permalink)
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Assuming the gears are the same, you'll actually be trading up (ever so slightly) since '78's had 11" drums in the rear vs. 80's 10" drums.

One catch, get the '78s ebrake cables since making the later ebrake cables fit the older brakes is a pain.

Other than that, it's all bolt-in.
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Old 03-06-2006, 09:41 AM   #7 (permalink)
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Thanks for the info guys . One thing I did fail to mention is that the '78 is a CJ-7, and my '83 is a CJ-5. Does that change anything? Is it a still basically a bolt in? I'll measure when I get off work, but ya'll might already know. Thanks
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Old 03-06-2006, 09:43 AM   #8 (permalink)
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Nope, changes nothing. Aside from any gear ratio quesitons, you're set.
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Old 03-06-2006, 11:37 AM   #9 (permalink)
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I put 82 axles under my 79 with no mods. the 82's are wider had 4.56, superior 1-pc and lock-right up front. I prefer the added width as well. I also went from and off centered rear quadra-trac to a D300, and these where the quickest way to get back on the trail. Of course I wasnt on the trail too long before I wanted to swap out the th400 in favor of a Ford T-18.The 400 ran great, just not behind the 258, so Im down again and wish I would have done all of it at one time, full width 60's and call it done for a week or two.
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Old 03-06-2006, 05:50 PM   #10 (permalink)
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Quote:
Originally Posted by fishotro
I put 82 axles under my 79 with no mods. the 82's are wider had 4.56, superior 1-pc and lock-right up front. I prefer the added width as well. I also went from and off centered rear quadra-trac to a D300, and these where the quickest way to get back on the trail. Of course I wasnt on the trail too long before I wanted to swap out the th400 in favor of a Ford T-18.The 400 ran great, just not behind the 258, so Im down again and wish I would have done all of it at one time, full width 60's and call it done for a week or two.
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Old 03-06-2006, 07:07 PM   #11 (permalink)
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not all 78's had the bigger brakes
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Old 03-07-2006, 06:24 AM   #12 (permalink)
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Quote:
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not all 78's had the bigger brakes
I thought they ran the 11" brakes up through the 70's?
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Old 03-07-2006, 08:20 AM   #13 (permalink)
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nope actually i believe the transition year was 77 but it may have been 78.... 76 they had the big brakes and some of the fronts were drum i think almost everything 77 up has the 10" brakes and front discs
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Old 03-07-2006, 08:20 AM   #14 (permalink)
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now the 78 front should have the more prefered 6 bolt hubs instead of the later 5 bolt hubs too
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Old 03-07-2006, 08:48 AM   #15 (permalink)
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My 78 CJ5 has 11" drums rear, disc front. I have a 79 spare axle w/10" drums. Not sure about the hub bolt count offhand.
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Last edited by piratebuggy; 03-07-2006 at 08:50 AM.
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