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Summit925
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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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A-bodies since 1978, this one since 1983
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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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oldkimmer
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If u want to use the brakes from the RR u will need brakes, drums, and the backing plates.........kim.......
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MR. Mechanic...........Panther Pink Duster The Beast has been Unleashed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Summit925
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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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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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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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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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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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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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MyCreation68
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Teach a child to be polite and courteous and, when he grows up, he'll never be able to merge his car onto the freeway.
-98 Dodge Ram SS/T 5.9L auto all stock
-92 Dodge Power Ram W250 5.9L CTD 5spd 4x4
-68 Dodge Dart GT 6cyl auto buckets console work in progress
-46 Fargo
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Summit925
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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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8-1/4 brakes fit fine, but the axles come out differently (c-clips).
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kawazuki8097
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Gen I Daks (87-91) had the five lug wheels.
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Only two people ever died for you,Jesus Christ and the American GI.
One died for your soul the other for your freedom.
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Jim_Lusk
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I don't know about the Rams. A few measurements will tell.
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doug 371
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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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Summit925
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im going to swap out the axles for the larger bolt patten
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doug 371
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then any brake combo will work as long as its matched and the axles are for big brakes
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magart
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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 $400 Ca.
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Beer in one hand, wrenches in the other.
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rt66jim
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BigBlockDart.Com
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I used Cordoba rear brakes on mine. Like was said just unbolt everthing for the housing end out. For the front you can use b-body spindles and upper control arms. I did this and used the 10" drums from a RR. Jim
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Summit925
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yeah my fronts are allready the larger bolt pattern but the guy befor me swapped in a 8 3/4 into it along with the small bolt pattern.. if i go the route of the 8 1/4 do i have to use the wheel cylinders and all that out of it too?
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fasttcars
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im going to swap out the axles for the larger bolt patten
just so you know you can just drill the small bolt patern axles to big bolt patern....i did that on my valiant...then bought new drums for like 80$[napa]...or you can use c-body drums.... [attachment deleted by admin] |
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loiq
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BigBlockDart.Com
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If it were me, I'd drill out the axles and get new drums.
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Summit925
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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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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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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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Jim_Lusk
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A-bodies since 1978, this one since 1983
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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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moparwedden
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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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gregpurcell
Guest
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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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Author
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. 
