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Author Topic: converting bolt pattern  (Read 739 times)
Summit925
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converting bolt pattern
« on: April 22, 2007, 11:10:47 PM »

im looking into converting my 5x4" bolt pattern on the rear of my duster to 5x4.5 it has a 8 3/4 in it and due to rust up here in minnesota the junk yards i have found dont have old mopars in. looking to get everything from the parts store, now i know i need axles but could i just buy the drums/shoes? i believe that my brakes are 10" would a 10" drum and rotor work off of say a 68 RR with the 8 3/4 rear and swap over all of my hardware ?? if that would not work what would i need to get?
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Jim_Lusk
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Re: converting bolt pattern
« Reply #1 on: April 22, 2007, 11:31:43 PM »

It is possible that the 10x2" setup will work with your backing plates, but I don't know for sure. Certainly anything wider than that won't fit. There were some Dakota (early five lug) rear brakes that would fit and last I heard thebacking plates were still available from Chrysler.
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Re: converting bolt pattern
« Reply #2 on: April 23, 2007, 12:41:27 AM »

If u want to use the brakes from the RR u will need  brakes, drums, and the backing plates.........kim.......
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Re: converting bolt pattern
« Reply #3 on: April 23, 2007, 04:37:06 PM »

would all of my hardware work with the new backing plates or whould i have to go with all that stuff too? would any backing plate work for this as long as they have the larger bolt pattern?
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Summit925
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Re: converting bolt pattern
« Reply #4 on: April 24, 2007, 12:26:00 AM »

also what years dakota?? and how can i tell the differnce between them when i see them online?
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Jim_Lusk
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Re: converting bolt pattern
« Reply #5 on: April 24, 2007, 12:37:56 AM »

Backing plates are not only diameter specific, but they are shoe width specific, too. All parts need to match from the same vehicle or you might wind up with problems. I don't know what year Dakotas.
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Summit925
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Re: converting bolt pattern
« Reply #6 on: April 24, 2007, 12:42:13 AM »

ohh alright how about the backing plates from yearone they are for B and E body cars with 10x2 1/2" brakes would thos work if i got 10x 2 1/2" drums and shoes for a 66-72 B or E body?? FD9241 and FD9240.
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Jim_Lusk
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Re: converting bolt pattern
« Reply #7 on: April 24, 2007, 01:28:35 AM »

I haven't looked at a Year One catalog in a long time, but you can bet if they have it, somebody else does for a lot less. I wouldn't be able to tell by looking. What I always do is pull a complete set off at the wrecking yard after checking the drums. That way you have a matched set.
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Summit925
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Re: converting bolt pattern
« Reply #8 on: April 24, 2007, 01:33:14 AM »

i would do that but up here in minnesota older mopars in junk yards are hard to come by, in there caption is says for anything but a 7 1/4 rear end? dont they have differnt monts for say a 8 1/4 rear compared to a 8 3/4?
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Re: converting bolt pattern
« Reply #9 on: April 24, 2007, 01:33:15 AM »

 Grin you could always make it easier on yourself and buy a rear disc conversion kit. That would elminator all problems. And I think there only like 600-700 bucks for the kit.  Cheesy Wink
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Summit925
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Re: converting bolt pattern
« Reply #10 on: April 24, 2007, 01:45:10 AM »

haha yeah i thought about doing that but decided not to but it seems to be a better option the bigger head ache i get from trying to figure this out....
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Jim_Lusk
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Re: converting bolt pattern
« Reply #11 on: April 24, 2007, 01:49:01 AM »

8-1/4 brakes fit fine, but the axles come out differently (c-clips).
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Summit925
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Re: converting bolt pattern
« Reply #12 on: April 24, 2007, 01:54:34 AM »

sorry about all this im just having a hard time seeing how this would work must be late.... ok so if i take the backing plates of say a mid 80's ram with the 8 1/4 with the  larger bolt pattern  rear they should bolt up to my 8 3/4 housing using the 8 1/4 drums/shoes? yeah ive taken the clips out of those rear ends but never total disasemled my dusters rear end , all i know is that the axles bolt on instead of clip on...



thank you thank you thank you thank you for all this help
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Re: converting bolt pattern
« Reply #13 on: April 24, 2007, 08:29:47 AM »

Gen I Daks (87-91) had the five lug wheels.
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Re: converting bolt pattern
« Reply #14 on: April 24, 2007, 11:04:57 AM »

I don't know about the Rams. A few measurements will tell.
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Re: converting bolt pattern
« Reply #15 on: April 25, 2007, 09:45:22 AM »

it says u are planning to change ur bolt pattern? how? if u use the stock axles ur still gonna need to use spacers
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Re: converting bolt pattern
« Reply #16 on: April 25, 2007, 12:15:08 PM »

im going to swap out the axles for the larger bolt patten
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Re: converting bolt pattern
« Reply #17 on: April 26, 2007, 09:48:00 AM »

then any brake combo will work as long as its matched and the axles are for big brakes
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Re: converting bolt pattern
« Reply #18 on: April 27, 2007, 01:45:20 PM »

I'm using an original a-body width 8 3/4 with A/M Yukon axles(be careful if u use them)...I went to a junkie and picked up a complete 8 1/4 off an 85 New Yorker and bolted everything up to make sure it fits, then I'm buying all new parts for that car locally and bolting them up...fit is fine(backingplates are a dealer-only item though)...all told, it'll cost me less than $400 Ca.
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Re: converting bolt pattern
« Reply #19 on: April 27, 2007, 04:09:58 PM »

I used Cordoba rear brakes on mine. Like was said just unbolt everthing for the housing end out. For the front you can use b-body spindles and upper control arms. I did this and used the 10" drums from a RR.  Jim
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Re: converting bolt pattern
« Reply #20 on: April 28, 2007, 03:00:36 AM »

yeah my fronts are allready the larger bolt pattern but the guy befor me swapped in a 8 3/4 into it along with the small bolt pattern.. if i go the route of the 8 1/4 do i have to use the wheel cylinders and all that out of it too?
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Re: converting bolt pattern
« Reply #21 on: April 28, 2007, 04:40:55 AM »

im going to swap out the axles for the larger bolt patten
just so you know you can just drill the small bolt patern axles to big bolt patern....i did that on my valiant...then bought new drums for like 80$[napa]...or you can use c-body drums....

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Re: converting bolt pattern
« Reply #22 on: April 28, 2007, 01:10:18 PM »

If it were me, I'd drill out the axles and get new drums.
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Summit925
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Re: converting bolt pattern
« Reply #23 on: April 30, 2007, 12:31:29 AM »

is that safe? i plan on running slicks when i get the larger bolt pattern and i dont wanna break something when i launch
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fasttcars
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Re: converting bolt pattern
« Reply #24 on: April 30, 2007, 02:31:21 AM »

is that safe? i plan on running slicks when i get the larger bolt pattern and i dont wanna break something when i launch
i run slicks on my car[11.69] and never had a problem... theirs still plenty of meat left
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Summit925
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Re: converting bolt pattern
« Reply #25 on: April 30, 2007, 11:35:55 AM »

sweet that sounds like a better deal then trying to convert all the brakes are c-body cars the only ones with the right size drum and lug spacing?
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Re: converting bolt pattern
« Reply #26 on: April 30, 2007, 01:36:19 PM »

No, a-body cars (and some Imperials) are the only cars that would be different. Any rear drive B/C/E/F/M/J-body will work (Late Lebaron coupe/convert were also called J-bodies, hence the rear drive remark).
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Re: converting bolt pattern
« Reply #27 on: April 30, 2007, 07:51:22 PM »

I Also Had Mine Drilled Out Just Make Sure You Have Them Weld A 1 Inch Ring Around The Outside And Make Sure You Have ThemdFrilled For The Larger Wheel Studs.A Mistake I Just Finished Fixing. Charged Me 125.00 For The Pair.
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Re: converting bolt pattern
« Reply #28 on: May 06, 2007, 03:53:50 PM »

Here's where you get into problems: If you DRILL OUT A body axles you have to use A body backing plates and drill out A body drums (or else get/make some sort of a spacer).

The a body axles have a 1/4 inch offset difference and the B/C/E body backing plates and drums will hit if you use them.

Just remember+ A body axles=A body drums/backing plates.

Cut down axles or aftermarket=use just about any backing plates.

Good Luck!
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