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  #1  
Old January 5th, 2020, 12:56
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jpk jpk is offline
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XJ disc brake swap

So from what I can glean from the net is, the KJ swap out is only for the 8.5 Chrysler rear end and the ZJ swap out applies to the D35c diff. Is this correct?
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  #2  
Old January 5th, 2020, 13:06
RCP Phx RCP Phx is offline
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Re: XJ disc brake swap

Yes, that's pretty much it.........
https://naxja.org/forum/showthread.php?t=1133743
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  #3  
Old January 6th, 2020, 06:57
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Re: XJ disc brake swap

Nice collection of parts there. Looks like all you need is the time to do it.
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  #4  
Old January 6th, 2020, 07:48
RCP Phx RCP Phx is offline
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Re: XJ disc brake swap

Well that was three years ago, so yes I'm enjoying the KJ and my WJ brakes so much I wished I had done that 20 years ago.
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  #5  
Old January 6th, 2020, 13:15
Redsnake Redsnake is offline
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Re: XJ disc brake swap

You can swap the ZJ discs onto the Chrysler 8.25" as I have done it. Just have to open the backing plates ever so slightly to fit over the 'ends of the axle' (not sure I said that correctly) but it's not hard. I'd guess a lot more ZJ's at the salvage yards but could be just as easy to find the KJ these days. I did my ZJ disc swap a few years back on my '01 XJ. Good luck!
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  #6  
Old January 6th, 2020, 19:04
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Re: XJ disc brake swap

Still my original question has not been answered in clarity. Is the KJ disc brake swap to an XJ, specific only to a Chrysler 8.5 diff? Can it be done with a D35c? I have read it is an easy bolt on swap to the C 8.5. Not much info on a switch on the D35c. Is it possible? For the ZJ swap, is the axle opening only needed to be enlarged with the C 8.5 or with the D35c as well? Hate to sound like a butt. Thanks for everyone's help so far. Maybe that info isn't available yet.
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  #7  
Old January 6th, 2020, 19:06
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Re: XJ disc brake swap

Sorry, I meant 8.25 Diff. Thanks.
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  #8  
Old January 6th, 2020, 19:22
Redsnake Redsnake is offline
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Re: XJ disc brake swap

Honestly I don't know regarding the D35c as I've only done it on my 8.25" Someone else will have to chime in on that. I'm super happy that I did the swap.
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  #9  
Old January 6th, 2020, 19:59
DocTremp DocTremp is offline
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XJ disc brake swap

I could be wrong, but the ZJ and KJ are direct bolt on for 8.25 diffs. If you have a dana 44 or 35 c you will need to modify the bolt pattern/holes on the backing plate and the plate that sets the axle bearing pre load.


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  #10  
Old January 7th, 2020, 07:03
RCP Phx RCP Phx is offline
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Re: XJ disc brake swap

Quote:
Originally Posted by DocTremp View Post
I could be wrong, but the ZJ and KJ are direct bolt on for 8.25 diffs. If you have a dana 44 or 35 c you will need to modify the bolt pattern/holes on the backing plate and the plate that sets the axle bearing pre load.


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ZJ brakes have to be modified to fit a C8.25 thus the reason for using KJ brakes off a C8.25.
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  #11  
Old January 7th, 2020, 07:10
Redsnake Redsnake is offline
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Re: XJ disc brake swap

Quote:
Originally Posted by RCP Phx View Post
ZJ brakes have to be modified to fit a C8.25 thus the reason for using KJ brakes off a C8.25.
Yup, you have to open the center opening a bit to get it to clear the ends of the axle.
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  #12  
Old January 12th, 2020, 13:38
Driver86 Driver86 is offline
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Re: XJ disc brake swap

So if I were to swap out my D35 for a C8.25 under my 01 XJ I could reuse my current ZJ disks by simply enlarging the center hole diameter of the backing plate? Axle flange bolt pattern is the same?
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  #13  
Old January 13th, 2020, 08:56
Redsnake Redsnake is offline
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Re: XJ disc brake swap

Quote:
Originally Posted by Driver86 View Post
So if I were to swap out my D35 for a C8.25 under my 01 XJ I could reuse my current ZJ disks by simply enlarging the center hole diameter of the backing plate? Axle flange bolt pattern is the same?
Good question. I am only sure that you have to enlarge the center hole to fit over the axle 'flange' ... but not sure on the 4 bolt pattern of the D35 vs C8.25? Could maybe find that on Google... or I'm sure someone here can answer that.
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  #14  
Old January 13th, 2020, 10:29
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Re: XJ disc brake swap

Axle flange pattern is not the same. KJ, Ford explorer, wrangler tj, crown Victoria and zj brakes are all interchangeable if you redrill or grind flange pattern
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  #15  
Old January 14th, 2020, 11:05
Car Enthusiast Car Enthusiast is offline
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Re: XJ disc brake swap

Where did you all get emergency brake cables from for your disc swap?
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