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  #16  
Old September 27th, 2017, 14:43
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sinat01 sinat01 is offline
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Re: Liberty conversion backing plate studs?

ARP might make a set, dunno how much cheaper they would be than dealer. Those T-bolts work?
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  #17  
Old June 30th, 2019, 08:59
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Re: Liberty conversion backing plate studs?

After reading conflicting posts on the issue of whether the backing plate studs will need to be replaced when going a disc brake conversion, I decided to hold off procuring replacements until doing a test fit on my own. So I did that and now see very clearly that the stock XJ studs will not do the job. So I’m looking online for replacements and am wondering if in the almost two years since the last post in this thread anyone has found an oem-style replacement stud at a price that doesn’t break the bank?
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  #18  
Old July 2nd, 2019, 11:06
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Re: Liberty conversion backing plate studs?

Has anyone tried using Crown Automotive backing plate mounting bolts, part no. J0994313? If so, how do they fit? Crown's website says they're compatible with D44s and D35s, but they don't expressly include Chrysler 8.25s. And, are they long enough? (See Crown's website description and specs, such as they are, here: https://www.crownautomotive.net/Brak.../J0994313.html.)

I'm inclined at this point to just go with regular grade 8 bolts and grind the heads, but I do want to ensure a very snug fit in the flange holes because, obviously, there'll be tremendous force wanting to make the backing plate rotate every time the brake is applied and any play will cause wear over time. So my preference would be to have a tight press fit, as with oem-style studs.
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  #19  
Old July 4th, 2019, 13:41
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Re: Liberty conversion backing plate studs?

Weld them in?
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  #20  
Old July 4th, 2019, 19:06
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Re: Liberty conversion backing plate studs?

I’ve thought of that too. May have to. That or make another trip to the JY to grab some studs off a Liberty or TJ.
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  #21  
Old July 5th, 2019, 07:54
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Re: Liberty conversion backing plate studs?

That should work just fine to ide think. After all they are intended to be there for the life of the vehicle.
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  #22  
Old July 5th, 2019, 09:22
RCP Phx RCP Phx is offline
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Re: Liberty conversion backing plate studs?

I don't recall the size of the bolts but these should work......
https://www.summitracing.com/parts/aaf-all72042?seid=srese1&gclid=EAIaIQobChMI0auPoJae4wI VFL3sCh3cdwrDEAQYASABEgL3jvD_BwE
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  #23  
Old July 20th, 2019, 18:50
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Liberty conversion backing plate studs?

I read a post by notamos in another thread saying that Polaris uses wheel studs the same size as XJ backing plate studs. Sure enough, they do. I found that Polaris part no. 7518378 wheel studs are a very close match for the backing plate studs that came off of my 8.25 axle, but are 3/8” longer. They also seem to be a tiny bit (3/128”) bigger around the knurled part of the shank. Of course, that little difference could just be attributable to the knurls on the XJ studs having been flattened somewhat when pressed into the mounting flange.











Anyway, I hope someone finds this information useful one day.

I probably ought to add that my research shows 50 foot pounds is generally accepted as the max torque for a 3/8-24 grade 8 bolt. So that’s what I’m going with.

Update:

I couldn’t press the Polaris studs into the holes. I just didn’t have a decent mechanical press that would work in the limited space available and couldn’t quite get them fully inserted using a nut to draw them in. So I reamed out the holes from 3/8 to 25/64. Worked like a charm. Studs went in, but are nice and snug.

Last edited by Nimrod; July 28th, 2019 at 11:22.
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  #24  
Old July 21st, 2019, 12:51
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Re: Liberty conversion backing plate studs?

Solid find! I'll be checking Prices on these.
Will you have to grind a flat edge on these?
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  #25  
Old July 22nd, 2019, 09:23
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Re: Liberty conversion backing plate studs?

I did grind the heads. Took a couple of minutes. No big deal.
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