Axle help - JeepForum.com
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post #1 of 19 Old 11-08-2019, 11:52 AM Thread Starter
jcoutu
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Axle help

Hello, I removed a D20 from a CJ frame. Measuring center to center for spring perches, it is about 36". I bought a D44 that I was told came off a CJ, however the spring perches are about 4" closer to each other. In researching CJ frame dimensions, I cannot see how this axle came off a CJ. The guy I purchased it from insists it is off a CJ, and AMC vs Jeep ownership made changes all the time including frame width in the rear which I assume is directly related to spring perches location. He refuses refund and also said just grind off the existing and weld in replacements, however that narrowness may be a problem? It seems the backing plates for the wheels may cause rubbing issues in the rear. I'm pretty ignorant on this issue and pretty much know I'll get a proper answer here. Thanks in a advance. James

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post #2 of 19 Old 11-08-2019, 12:23 PM
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The Dana 44 came in jeeps CJs, FSJs also other makes as well. The Narrow track 76-81 cj will measure 50.5" backing plate to backing plate, purch to purch is 36". Widetrack 82-86, 54.5" b to b and purch measure is the same a narrow track. The Dana was dropped in 76 by AMC, but was used again in 86 as AMC 20s supplies dwindled.
What are your measurements?
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post #3 of 19 Old 11-08-2019, 12:35 PM Thread Starter
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The D44 backing plate to backing plate is 45". Didn't measure spring perch center to center, but guessing about 32" center to center. I have a pic but can't seem to figure out how to add.....
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post #4 of 19 Old 11-08-2019, 12:50 PM Thread Starter
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Pic comparing the original D20 to the D44 showing spring perch locations, it really narrow.
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post #5 of 19 Old 11-08-2019, 01:42 PM
letitloose06
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That looks like a centered D44 from a 72-75 CJ5. The 72-75 CJ5 had a much narrower frame in the rear.

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post #6 of 19 Old 11-08-2019, 03:29 PM
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The Dana 20 is a transfer case. What axle was in the Jeep: AMC 20?
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post #7 of 19 Old 11-08-2019, 04:03 PM Thread Starter
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Quote:
Originally Posted by letitloose06 View Post
That looks like a centered D44 from a 72-75 CJ5. The 72-75 CJ5 had a much narrower frame in the rear.
Oh? OK I didn't know the CJ5 came with a narrower frame. That makes sense now. All the frame specs I was able to research (seems I did not do enough) show the CJ5 and CJ7 widths at the rear, the same. With b plate to b plate at 45" I'm not going to use this axle, getting another wide D44 from a friend.
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post #8 of 19 Old 11-08-2019, 04:08 PM Thread Starter
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Ah, makes sense. All the specs I've seen for CJ5 and CJ7 frame width at rear were the same... Guess I didn't find the right info. Thanks I'm still concerned about the 45" back plate to back plate spacing. Probably will not use this axle.
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post #9 of 19 Old 11-08-2019, 04:09 PM Thread Starter
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Ops yes the xfer case is D20 and the axle is AMC20
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post #10 of 19 Old 11-08-2019, 04:13 PM
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Quote:
Originally Posted by jcoutu View Post
Oh? OK I didn't know the CJ5 came with a narrower frame. That makes sense now. All the frame specs I was able to research (seems I did not do enough) show the CJ5 and CJ7 widths at the rear, the same. With b plate to b plate at 45" I'm not going to use this axle, getting another wide D44 from a friend.

55-75 CJ-5 and CJ-6's had a straight frame, they did not flare out wider under the pass compartment.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #11 of 19 Old 11-08-2019, 05:01 PM
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In regards to matching the stock width of what you have, a 72 to 75 CJ 5 /6 rear Dana 44 will need to have its spring perched cut and moved to match the wider rear frame spacing used on the 76 on frames. This will work up to 83 CJ5 or 81 CJ 7 as these used the narrow track axles.
For it to be a direct bolt in on the 82 to 86 CJ7/8 for both the width and perches, a Dana 44 from a late 86 CJ7 will need to be used.
If a wider 44 is desired, a Scout II rear axle will still need the perches moved, but the bolt pattern is still 5 on 5.5

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post #12 of 19 Old 11-08-2019, 10:07 PM
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The 72-73 Commando D44 is a bolt in for any '76-86 CJ and is narrow track width.

The Commando had the springs outboard of the frame rail and the perch to perch width matches '76 and up CJs.

Quote:
Originally Posted by jcoutu View Post
Oh? OK I didn't know the CJ5 came with a narrower frame.
It has nothing to do with what model CJ it is, it's the year.
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post #13 of 19 Old 11-09-2019, 12:25 AM Thread Starter
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I do not understand something. The narrow track axles seem to be 50.5" and the wide 54.5. This axle is 45" plate to plate and this is very confusing. Even though I can relocate the spring perches, why is the width so short? And, if an imbalance with the width of the front, what should I expect?
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post #14 of 19 Old 11-09-2019, 01:18 AM
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Arent those old 44s two piece, 19 spline axles?

What are you trying to accomplish by swapping the axle?
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post #15 of 19 Old 11-09-2019, 11:07 AM
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Quote:
Originally Posted by jcoutu View Post
I do not understand something. The narrow track axles seem to be 50.5" and the wide 54.5. This axle is 45" plate to plate and this is very confusing. Even though I can relocate the spring perches, why is the width so short? And, if an imbalance with the width of the front, what should I expect?
The narrow and wide track measurements are measured “Wheel mount surface” (WMS) to WMS. Your backing plate measurement is what is throwing you off. That is not a commonly used place to measure a rear end assembly.

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