XJ axle swap/build

[DocTremp]

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[DocTremp]

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[GordoSmasho]

Originally Posted by DocTremp

Thanks for the input! I was thinking about the transfer case and was looking around for a NP 241O out of a rubicon but they are almost as much as an Atlas. I don’t know if it’s worth looking into a doubler or if it’s less hassle to just put the money into one of those. How are 5.38s on the street with 37s?


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5.38s and 37s is pretty good in the street. 2500rpm ish at 65.

I was ready to buy an atlas 2 but the driveshaft length was more an issue than i wanted to deal with. Also the crossmember would be unconventional as well. I had already bought a d300 and 231 doubler. But the packaging wasn’t the best. Didn’t want to cut the floor to make a flat belly. Thus my finally decision of a 4speed atlas. Hard nut to swallow but it was the best upgrade i have done to the jeep for sure. Also only need one spare driveshaft.

[DocTremp]

Originally Posted by GordoSmasho

5.38s and 37s is pretty good in the street. 2500rpm ish at 65.

I was ready to buy an atlas 2 but the driveshaft length was more an issue than i wanted to deal with. Also the crossmember would be unconventional as well. I had already bought a d300 and 231 doubler. But the packaging wasn’t the best. Didn’t want to cut the floor to make a flat belly. Thus my finally decision of a 4speed atlas. Hard nut to swallow but it was the best upgrade i have done to the jeep for sure. Also only need one spare driveshaft.

That’s not too bad, I may have made a mistake going with 4.56s haha! 😬😬😬

Yeah, I don’t want to have to do much cutting if at all. I agree it’s definitely an investment but it sounds like it’s well worth it. With an Atlas 4 speed you have 1:1, and 3 more lower gears? Not sure how I am going to get my wife to go for it though....


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[GordoSmasho]

Originally Posted by DocTremp

That’s not too bad, I may have made a mistake going with 4.56s haha! 😬😬😬

Yeah, I don’t want to have to do much cutting if at all. I agree it’s definitely an investment but it sounds like it’s well worth it. With an Atlas 4 speed you have 1:1, and 3 more lower gears? Not sure how I am going to get my wife to go for it though....


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Yeah. 3 lower options if you get the right options. I would mine has a 2.72 reduction housing which is stock. And a 3.8 rear housing. Then you combine them to 10.3. I tell you what, the control i feel in low low is unbelievable. I flipped rigs and parts to pay for stuff. Its the long road but its doable. I wheeled it for almost two years with the stock tcase. It is totally doable. Just a bit less controlled for technical crawling.

[DocTremp]

Originally Posted by GordoSmasho

Yeah. 3 lower options if you get the right options. I would mine has a 2.72 reduction housing which is stock. And a 3.8 rear housing. Then you combine them to 10.3. I tell you what, the control i feel in low low is unbelievable. I flipped rigs and parts to pay for stuff. Its the long road but its doable. I wheeled it for almost two years with the stock tcase. It is totally doable. Just a bit less controlled for technical crawling.

That’s sounds pretty awesome, having all those options to apply to different situations like rocks, mud or sand. I’ll have to stick with my 231 for now but I’ll have to start saving for an atlas 4 spd right now haha.


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[Rob D]

Originally Posted by DocTremp

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My axle looks just like yours right now. I'm hoping to start welding the truss on Monday. I still haven't decided to put the 5.13's I got from Gordo into it or step up to the 5.38's, though the 5.38's might be a better choice for getting to the trails.

[DocTremp]

Originally Posted by Rob D

My axle looks just like yours right now. I'm hoping to start welding the truss on Monday. I still haven't decided to put the 5.13's I got from Gordo into it or step up to the 5.38's, though the 5.38's might be a better choice for getting to the trails.

Right on man! I’m going to prep/fit mine for the truss tomorrow I hope. From what Gordo has told me, it might not be a bad idea to gear it for street-ability then get a tcase with really low gearing? I think that’s the direction I’m going. Do you have the same kind of truss and do you have a F250 or f150 d44?


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[Rob D]

Yeah, I have the same TnT truss. I have an F250 front this time. I have a 150 narrowed down to take TJ d44 inners now but it's too narrow for 37's with the wheels I have. I've got a 3.8 Atlas to make the crawling easier and 4.88's for now.

[GordoSmasho]

With an automatic you can fudge on the axle gearing a bit and still have decent drivability. Hell alan ran 3.55s with 42s. He was just as fast off the line as mine with 4.88 and 35s when mine was auto. The torque converter gives you almost an infinite first gear so it’s fairly forgiving.
However with a manual there is only so much you can slip the clutch. So gear axles for driving on the street and make up the speed you need in the rocks with lower tcase gearing.

[DocTremp]

Originally Posted by Rob D

Yeah, I have the same TnT truss. I have an F250 front this time. I have a 150 narrowed down to take TJ d44 inners now but it's too narrow for 37's with the wheels I have. I've got a 3.8 Atlas to make the crawling easier and 4.88's for now.

Right on man! I hope to get an atlas sometime in the future.

Got the truss fitted to my axle today but couldn’t weld it on as my inner C’s aren’t welded on yet. Got the angles where I think they should be. The angle of my front drive shaft is 10-11 degrees and I have the pinion angle set to 10 degrees. Each C is set to 5-6 deg positive castor right now. My friend is going to weld them on with stainless or nickel rod and an arc welder. Hope to finish gearing the rear axle and weld the truss on next weekend.


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[DocTremp]

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[DocTremp]

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[DocTremp]

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[DocTremp]

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