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  #271  
Old December 5th, 2021, 21:13
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Re: XJ axle swap/build

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Thatís a good idea, I have some PVC lying around from my mock up links. For squaring your axle to the body, what landmarks did you measure from?

Thanks, Iíll check them out.


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hang the leaf springs and measure from outside face of the leaf pack to the inside face of the axle flange. You can measure from a bunch of things but leaf to flange seems to be one of the most reliable places to reference on each side. I did not account for the 1-2 degree compensation Rob mentioned. For what its worth, I haven't encountered leaf wrap symptoms. If I did, I'd look into an anti wrap bar before cutting off the U bolt eliminators and re-doing them.
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  #272  
Old December 6th, 2021, 16:11
DocTremp DocTremp is offline
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XJ axle swap/build

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Originally Posted by Nates2000XJ View Post
hang the leaf springs and measure from outside face of the leaf pack to the inside face of the axle flange. You can measure from a bunch of things but leaf to flange seems to be one of the most reliable places to reference on each side. I did not account for the 1-2 degree compensation Rob mentioned. For what its worth, I haven't encountered leaf wrap symptoms. If I did, I'd look into an anti wrap bar before cutting off the U bolt eliminators and re-doing them.

Got it, thanks Nate. That makes a lot of sense. Iíve read in other threads about angling pinion 1-2 degrees, but Iíve heard from both sides that their set ups work without issue. I think it may be preference? Idk.


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  #273  
Old December 6th, 2021, 21:40
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Re: XJ axle swap/build

Maybe. May be spring stiffness, gear ratio/final drive ratios. I'd have to think on it and draw force vectors or something.
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  #274  
Old December 7th, 2021, 06:14
maxbraketorque maxbraketorque is offline
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Re: XJ axle swap/build

The notion of angling the pinion down 1-2 deg relative to the drive shaft is to compensate for axle wrap. For sure there is no reason to make the pinion shaft parallel to the drive shaft. Only question is how much to angle it down. Adams recommends 1-2 deg.
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  #275  
Old December 7th, 2021, 16:21
DocTremp DocTremp is offline
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XJ axle swap/build

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Maybe. May be spring stiffness, gear ratio/final drive ratios. I'd have to think on it and draw force vectors or something.

Aww man, take it easy with those force vectors haha. I enjoyed that part of physics, but I donít use them too often anymore. I think spring stiffness if probably it, but Iím sure hear ratios have something to do with it as well.


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  #276  
Old December 7th, 2021, 16:28
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XJ axle swap/build

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Originally Posted by maxbraketorque View Post
The notion of angling the pinion down 1-2 deg relative to the drive shaft is to compensate for axle wrap. For sure there is no reason to make the pinion shaft parallel to the drive shaft. Only question is how much to angle it down. Adams recommends 1-2 deg.

I got ya. Sounds like thatís if youíre running leaf springs without a torsion bar, which is what I am doing, but Iíd rather add a torsion bar to fix the axle wrap then change my pinion angle. The point of your pinion being parallel to the drive shaft is to limit vibration I believe.


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  #277  
Old December 7th, 2021, 21:52
maxbraketorque maxbraketorque is offline
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Re: XJ axle swap/build

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Originally Posted by DocTremp View Post
I got ya. Sounds like thatís if youíre running leaf springs without a torsion bar, which is what I am doing, but Iíd rather add a torsion bar to fix the axle wrap then change my pinion angle. The point of your pinion being parallel to the drive shaft is to limit vibration I believe.


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Actually, the angle needs to be slightly off parallel to drive the needle bearings in the u-joint to circulate. 1-2 deg (or maybe 1-1.5 deg) off parallel should be the target whether or not you plan to limit axle wrap with torsion bars.
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  #278  
Old December 8th, 2021, 12:52
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XJ axle swap/build

I got ya, if the needle bearing donít move then the life of the u joint is reduced. Thanks for the input.


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  #279  
Old December 13th, 2021, 03:19
89Mock 89Mock is offline
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Re: XJ axle swap/build

I did my Sterling 1.25 using the ruff stuff +2 perches. Angle the pinion down 2 degrees. Part of the reason is so the u joints get lubricated while they rotate. If theyíre absolutely perfectly at zero theyíll burn up, but this wonít ever happen on our Jeeps. The pinion just moves up more than youíd think. At first I did mine without the full weight on the vehicle. Do yours with the new tires on all four corners. Thatís what youíre going to be driving with so thatís what you should set it up with. I took as many measurements as I could before assuming the axle was centered.
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  #280  
Old January 20th, 2022, 11:56
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XJ axle swap/build

For those of you who have done wider axles, what length did you go with brake lines? I have 22Ē now and I donít think itís enough. Iron rock has 27Ē front and 22Ē rear as a combo, ruff stuff has 30Ē fronts but no rear. Any advice would be awesome, thanks!


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  #281  
Old January 20th, 2022, 22:17
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Re: XJ axle swap/build

My fronts are Crown extended XJ steel braided lines. 5-6" lift size iirc I picked the longest ones they offered. They are plenty long, my shocks droop out before the brake lines do. The rears was the steel braided line from the Crown kit and I kept the rubber soft and hard lines from my ZJ brake set up on the stock axles. I ended up needing to ream out the banjo fittings on the caliper side of the brake lines since the larger brakes used a larger dia banjo bolt. My larger brakes also benefitted from a larger master cylinder but that's not really related to lines. I'll try to post a photo or two
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  #282  
Old January 21st, 2022, 11:51
DocTremp DocTremp is offline
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XJ axle swap/build

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Originally Posted by Nates2000XJ View Post
My fronts are Crown extended XJ steel braided lines. 5-6" lift size iirc I picked the longest ones they offered. They are plenty long, my shocks droop out before the brake lines do. The rears was the steel braided line from the Crown kit and I kept the rubber soft and hard lines from my ZJ brake set up on the stock axles. I ended up needing to ream out the banjo fittings on the caliper side of the brake lines since the larger brakes used a larger dia banjo bolt. My larger brakes also benefitted from a larger master cylinder but that's not really related to lines. I'll try to post a photo or two

Thanks Nate! I have 4-6 inch lift extended brake lines from RE and I wasnít sure if theyíd be long enough. I think I might just run them and see what stops the flexing first.
What MC did you end up running BTW?


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  #283  
Old January 23rd, 2022, 11:41
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Re: XJ axle swap/build

Have you relocated or removed the lower brake line clip on the body?
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  #284  
Old January 23rd, 2022, 20:52
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Re: XJ axle swap/build

Centric: 131.67025
Amazon link below. Look on Rockauto or other sites to find the best deal.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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  #285  
Old January 23rd, 2022, 20:55
DocTremp DocTremp is offline
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XJ axle swap/build

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Have you relocated or removed the lower brake line clip on the body?

I pulled them off for frame stiffeners and I have yet to relocate them.


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