What rear ends will fit under a CJ7? - JeepForum.com
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post #1 of 19 Old 05-21-2020, 07:39 AM Thread Starter
304aaron
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What rear ends will fit under a CJ7?

I'm looking for a rear end to replace the off set AMC 20 that was factory in my Jeep. I'm changing to a traditional center shaft transfer case. My question is what options do I have out there for the correct width? I know a guy who has a ford 9" out of a Bronco, but it's about 5" wider then the 20 that's in it now. Is my only option to use a centered 20 or somehow try to find a Dana 44 from an 86? But even with that, I'm pretty sure my jeep is a narrow track and the 44 would be a wide track. Looking for some help on where to start looking. Thanks!

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post #2 of 19 Old 05-21-2020, 08:59 AM
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post #3 of 19 Old 05-21-2020, 09:26 AM
oldschool74cj5
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hello

the easiest is to use a narrow track. if you run a wide track you can add some 1-1/4 or 1-1/2 billet spacers to bring the fronts width about the same as the rear then.

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post #4 of 19 Old 05-21-2020, 10:35 AM
John Strenk
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I'm surprised you can't find any center narrow track ones. Nobody usually wants those.

But I do like oldschool74cj5 idea if you happen to find a 44. But remember that the gear ratio is probably wrong in the wide track so you have to add that into the equation also.


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post #5 of 19 Old 05-21-2020, 11:20 AM Thread Starter
304aaron
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I
spoke to a local drive line shop today about cutting down a Ford 9". I'm a little scared to see what price he comes back with!
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post #6 of 19 Old 05-21-2020, 11:30 AM
RiverandSand
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Originally Posted by 304aaron View Post
I'm looking for a rear end to replace the off set AMC 20 that was factory in my Jeep.
You must be replacing a QuadraTrac system. Any Amc 20 non QT from 76-81 NT are centered, will fit. A D44 from a Commando will fit also. As others have said D44 WT will fit also. You could also go custom from Currie or the like.
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post #7 of 19 Old 05-21-2020, 11:50 AM
jeepdaddy2000
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Another option is to keep the offset axle and adapt in a D18 t case.

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post #8 of 19 Old 05-21-2020, 12:26 PM
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I
spoke to a local drive line shop today about cutting down a Ford 9". I'm a little scared to see what price he comes back with!
I would probably look at early toyota pick up truck 8" axle if I was going to all of the cost and trouble of a narrowing a 9" ford. Stock electric locker with 4.10 drop outs can be reasonably had. 6 lug pattern could be a plus depending on what front axle you want to find.

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post #9 of 19 Old 05-22-2020, 03:56 AM
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I have a centre output D300 out to a off centre Toyota Landcruiser FJ series axle in Puthijeep (about the same as a Danaa 44). The angles are doable, as this particular CJ is not lifted, and it has been running like this for over 10 years.

The front joint was run dry by the PO and had square trunnions and dust for needle bearings when I got it. However the greased replacements have lasted 9 years.

Have you looked at the arrangement and satisfied yourself that you CANNOT use the existing axle? It is a question of clearance and angles that the joints run through.
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post #10 of 19 Old 05-22-2020, 04:47 AM Thread Starter
304aaron
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Have you looked at the arrangement and satisfied yourself that you CANNOT use the existing axle? It is a question of clearance and angles that the joints run through.
I guess I really "could" use it, but as I put this Jeep back together I'm committed to putting things in the way I really want it and only doing it once even if it takes me longer to get it back together. So the quadra trac is not what I really wanted. However I didn't know about the Dana 18 transfer case option. I think I would be ok with that.
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post #11 of 19 Old 05-22-2020, 05:12 AM
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Quote:
Originally Posted by 304aaron View Post
I guess I really "could" use it, but as I put this Jeep back together I'm committed to putting things in the way I really want it and only doing it once even if it takes me longer to get it back together. So the quadra trac is not what I really wanted. However I didn't know about the Dana 18 transfer case option. I think I would be ok with that.

While not for everyone, the QT is a good case. The biggest issue is sourcing quality chains. They can be converted to part time with with a Mile Marker kit. If you do replace it, be sure to advertise it here, as there a number of members who would probably be tickled to have a spare on hand.



As for the D18, a starting point.

https://www.novak-adapt.com/catalog/...transfer-case/

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post #12 of 19 Old 05-22-2020, 06:08 AM
DV915
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Itís really not that expensive to find a Ford 9 inch at the junkyard and have the housing and axles narrowed to your specification. Any local machine shop can narrow the housing and the axles can be shipped to a shop that specializes in cutting and re-splining the axles. The new gears and gear setup would be the most costly aspect of the project but you could likely have everything done for around $500.
This is the route that I took.
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post #13 of 19 Old 05-22-2020, 09:54 PM
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What do you plan to do with your Jeep? If only street and moderate off road, I think it makes mire sense to find somethng that will bolt in or require little fabrication.. There's nothing wrong with narrow track AMC 20 or 72-75 CJ D44. With the AMC 20, you have a better chance of finding an axle with compatible gear ratios.
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post #14 of 19 Old 05-22-2020, 10:02 PM
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If you can, you can find 44's out there. My 73 has a D44
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post #15 of 19 Old 05-23-2020, 05:11 AM
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You can really do whatever you want with it. If you are adapting a transfer case, you could adapt a center output 300, as easy as you could adapt a offset output 18.
If you decide to narrow a stronger axle to fit, you could center it, or offest it to match.

I run the offset Dana 18, with a 6" narrowed offset 14bolt axle to match.
The reason I narrowed it 6" is that the stock axle shafts are 6" shorter on one side. Now I just run two short side shafts that
I can pick up for $25 all day at the pick and pull if ever needed.
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