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  #1  
Old October 13th, 2021, 23:29
stleus stleus is offline
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Question XJ to WJ Disc Brake Conversion Advice Needed

Hello, Pick Pull is running a brake rotor caliper sale next week and I was thinking about doing a WJ front brake conversion on my 2000XJ. My XJ has a RE 5.5 long arm kit with 31's and I use it to haul around my boat. The brakes are really bad for my needs/build.....my question is, can I just swap out my XJs knuckles/brakes for the WJs without affecting anything else. I don't want to change anything in the steering department. Will my current steering components mate to the WJ knuckles/ball joints? Does my lift play into this at all? Thanks

I already gathered the parts for the rear upgrade from a JK
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  #2  
Old October 14th, 2021, 04:01
Jim Malcolm Jim Malcolm is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

The arm on both knuckles for the cross-bar is slightly lower on a WJ knuckle and the TRE taper is still from the bottom side, increasing the TRE angle at both ends more than it already is. With droop, eventually the TRE will reach its limits, which certainly isn't good. Drilling out the hole in the knuckles and installing inserts to flip the taper to the top will get you less TRE angle than you have now. The linkage up to the steering box should clear the upper arm on the PS knuckle, but worst case cut if off. I've read other people saying its possible but I'm not sure at 5.5", long arms and y-link steering. Assuming you're still using y-link style steering that is...
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  #3  
Old October 14th, 2021, 06:14
75SV1 75SV1 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

The lower ball joint needs replaced with one for a WJ. I believe the TRE tapers are the same. I did a fitment at the PnP many years ago. As to the angles mentioned above, I can't say either way. I went with GM 1-ton cross over steering and OTK trackbar on the two WJ Big Brake conversions I did.
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  #4  
Old October 14th, 2021, 07:16
RCP Phx RCP Phx is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

Quote:
Originally Posted by stleus View Post
Hello, Pick Pull is running a brake rotor caliper sale next week and I was thinking about doing a WJ front brake conversion on my 2000XJ. My XJ has a RE 5.5 long arm kit with 31's and I use it to haul around my boat. The brakes are really bad for my needs/build.....my question is, can I just swap out my XJs knuckles/brakes for the WJs without affecting anything else. I don't want to change anything in the steering department. Will my current steering components mate to the WJ knuckles/ball joints? Does my lift play into this at all? Thanks

I already gathered the parts for the rear upgrade from a JK
Are set-up's are close to the same (RE5.5/LA's) running the WJ/KJ brakes. I run a factory based steering (Currie Currect-lync) in the stock location for about 5yrs now without a single issue.
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  #5  
Old October 14th, 2021, 07:57
Evan03 Evan03 is offline
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XJ to WJ Disc Brake Conversion Advice Needed

At 5.5" the upgrade is full wj steering over the knuckle along with a matching track bar. A side benifit might be slightly better braking.
Adjusting rear brakes could potentially increase current braking performance dramatically.

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  #6  
Old October 14th, 2021, 08:34
JonnyCat63 JonnyCat63 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

I did the WJ swap on my 99. I did a custom track bar and steering set up. Part of the benefits of doing the WJ swap is getting a better steering set up. That's one of the main reasons to do it and get rid of the stock weak components. If you don't want to change the steering, just put some better pads, such as Black Magic, and try that.

Long story short, you are going to have to address your steering in some way. The WJ set up is nice, but more work than you think. You have to weld on the spacers to the knuckle, ball joints from a WJ, proper wheel bearings, different rotors, and steering. Depending on the steering set up, you might need to address the track bar, too.

Sounds like RCP's set up might be the way to go if you're set on the swap. However, the Currie Currect-Lync is pricey.
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  #7  
Old October 14th, 2021, 09:24
RCP Phx RCP Phx is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

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Originally Posted by JonnyCat63 View Post
Sounds like RCP's set up might be the way to go if you're set on the swap. However, the Currie Currect-Lync is pricey.
I just wanted the brakes and I ran a totally stock set-up before I switched to the Currie (my stock set-up was all bent up after years of abuse).
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  #8  
Old October 14th, 2021, 10:19
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Da XJ nut Da XJ nut is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

let's not forget that the WJ uses 5 on 5 bolt circle like the JK does. So wheel swap is a must or using adapters. Just my 3 cents worth
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Old October 14th, 2021, 10:31
JonnyCat63 JonnyCat63 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

Quote:
Originally Posted by Da XJ nut View Post
let's not forget that the WJ uses 5 on 5 bolt circle like the JK does. So wheel swap is a must or using adapters. Just my 3 cents worth
That's not what you have to do with a WJ swap. You use a unit bearing from a 99+ XJ, or I think one out of an early TJ. I'd have to look up the part number. You don't use a WJ unit bearing.

You then use either a pre-drilled WJ rotor from Iron Rock Off Road. Or do what most people do and drill out a WJ rotor with the XJ pattern. It's easy to do and no adapters or change of wheel is needed.

However, some 15" rims won't clear the WJ calipers, so a wheel swap or spacers may be needed, but not because of bolt pattern. You can keep the same 5x4.5 bolt pattern both front and rear.
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  #10  
Old October 14th, 2021, 10:35
JonnyCat63 JonnyCat63 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

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Originally Posted by RCP Phx View Post
I just wanted the brakes and I ran a totally stock set-up before I switched to the Currie (my stock set-up was all bent up after years of abuse).
Just curious. Did you go over the knuckle or under? Did you have to use inserts/ream, or are the stock TRE's the same taper?

I used 1 ton TRE's and had to ream out the knuckle for the new taper.
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  #11  
Old October 14th, 2021, 10:48
75SV1 75SV1 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

I'd say with WJ Big Brakes, you are looking at $1,000 to $1,400. The cross over steering about $400. Also, you might have to either grind the calipers down for a 15" steel wheel, spacers, or go to 16" rims. On my first one, I had 15X8 rims with 2 inch spacers to get them to work. My present one, I tried 15 inch steels and they did bind. I have 16" aluminums rims for a 2000 XJ.
I would try as has been suggested, Black Magic brake pads, and make sure your rear brakes are working. Possibly do the KJ rear disc brake conversion. Also, make sure the surface where the steel plate of the brake pads slide on, does not have any dents in it. This is common on the XJs knuckles.
I have had my WJ knuckles reamed for the 1-ton Chevy TREs and have used the inserts. Mine is under. The TREs from Ruff Stuff, the boots are still good after say 5 years. Ones I got off of E-Bay, the boots cracked within a year.
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  #12  
Old October 14th, 2021, 11:02
RCP Phx RCP Phx is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

Quote:
Originally Posted by JonnyCat63 View Post
Just curious. Did you go over the knuckle or under?
I'm still running the factory UTK set-up. The Currie set-up uses the stock taper tre's.

Quote:
Originally Posted by 75SV1 View Post
I'd say with WJ Big Brakes, you are looking at $1,000 to $1,400.
I have had my WJ knuckles reamed for the 1-ton Chevy TREs and have used the inserts. Mine is under. The TREs from Ruff Stuff, the boots are still good after say 5 years. Ones I got off of E-Bay, the boots cracked within a year.
My whole conversion was about $500 using the p-n-p knuckles and RA calipers.
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  #13  
Old October 14th, 2021, 11:14
Evan03 Evan03 is offline
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XJ to WJ Disc Brake Conversion Advice Needed

70 bucks.
I have wj brakes, disc rear. They work better but not a ton better. My biggest improvement came when i adjusted rear drums.

Wj steering was a big improvement on my rig. I went over the knuckle.

I definitely wouldn't do wj stuff just for brakes.

I think all lifted rigs over 4" need better steering angles that wj knuckles provide. Brakes ehhhh

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  #14  
Old October 14th, 2021, 11:25
75SV1 75SV1 is offline
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Re: XJ to WJ Disc Brake Conversion Advice Needed

My price was with basically, all new parts.
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  #15  
Old October 14th, 2021, 11:34
Evan03 Evan03 is offline
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XJ to WJ Disc Brake Conversion Advice Needed

1000-1400 is realistic
Ball joints, hubs, rotor, calipers, 1/4" spacers, knuckles, reamer, steering, track bar, track bar bracket, brackets, time, misc grinding wheels had, welder, someone elses time.

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