Looking for repro backing plates for 8 3/4 diff

ridergary · MIDLAND, ONT

Looking for repro backing plates for 8 3/4 diff

RacerRick · TORONTO, ONT

You can purchase them new still from chrysler unless you want to use the oddball A-body small bolt pattern brakes. The housing end bolt pattern is the same as the 8.25" rear and you can buy them from the dealership still. The 8.25 and 8.75" brakes are interchangeable for the most part.

DJD · SCARBOROUGH, ONT

there are 2 different size rear drums for dodge - helps to know what size drums you have

I might be able to get ahold of backing plates and compleate hardware for the larger size drums - IF my buddy I gave my coronet to wants to unload them

they were sepperate from the car

you would need the correct large drums and probably known good wheel cylinders

backing plates and brakes were original large drum on a '66

gkent · BRANTFORD, ONT

I believe the 8-3/4 drums are the same size, just different widths.

I believe there is a set for sale on Moparts - try the '70 and older B-body parts for sale forum

-- Edited by gkent on Tuesday 22nd of March 2016 07:50:29 PM

DJD · SCARBOROUGH, ONT

I think they came in 10 and 11 inch - the 11's also being slightly wider

Backfire · Member

A body 8 3/4" has a 10" backing plates as well as some E bodies, B-E-C body and trucks and vans have 11" backing plates.
Drums varied between 1 3/4" wide by 10" dia. on A bodies to 2 1/2" wide by 11" dia. on E bodies etc...

He needs to know what axle he has, the backing plate is relative to the axle shaft, as to what will interchange.

For example, you can't throw an 11" backing plate from a truck on an A body axle and throw an 11" drum and hardware on it.
It just won't line up, the drum locates on the axle shaft at a different offset.

Scroll down to section 2, " Flange Axle Taper and Flange Differences" (near bottom of page) there's some good detailed info there.

www.mymopar.com/Mopar8_75RearEndGuide.htm

Explains it better then I could with words. Hope the links helps you make a better choice.

Year One and other places offer re-pops, but only for specific applications.

-- Edited by Backfire on Tuesday 22nd of March 2016 11:46:38 PM

RacerRick · TORONTO, ONT

The axle shaft flange offset from the bearing is the same for all 8.75" rears. This is why I used to cut down and respline axles without worrying about what brakes came with it.

The offset is all in the backing plate. You just get the backing plate, then buy the matching drums. If you want a specific drum size, buy the matching backing plate.