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Rear end swap 7 1/4"-8 3/4" #1560308
01/07/14 04:29 AM
01/07/14 04:29 AM
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PasiR Offline OP
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PasiR  Offline OP
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Can I use 7 1/4" drum backing plates for 8 3/4" housing?

Re: Rear end swap 7 1/4"-8 3/4" [Re: PasiR] #1560309
01/07/14 12:52 PM
01/07/14 12:52 PM
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Graham, WA
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Polarapete Offline
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Graham, WA
As long as you have the parts in hand you might as well see if they bolt up. That seems to be the way a lot of us have found how all this stuff goes together. Chrysler probably used the same backing plates based on drum size for 7.25" and 8.75" stuff. Let us know.


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Re: Rear end swap 7 1/4"-8 3/4" [Re: PasiR] #1560310
01/07/14 03:23 PM
01/07/14 03:23 PM
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dogdays Offline
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except the A-body specific stuff?

R.

Re: Rear end swap 7 1/4"-8 3/4" [Re: dogdays] #1560311
01/07/14 03:30 PM
01/07/14 03:30 PM
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Posts: 2,165
Inver Grove Heights MN
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74RR Offline
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Inver Grove Heights MN
I thought the 7 1/4 plates wouldn't bolt up to a 8 1/4 or 8 3/4" rear?

Re: Rear end swap 7 1/4"-8 3/4" [Re: 74RR] #1560312
01/07/14 03:52 PM
01/07/14 03:52 PM
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Florida
BDW Offline
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Florida

Re: Rear end swap 7 1/4"-8 3/4" [Re: BDW] #1560313
01/07/14 07:11 PM
01/07/14 07:11 PM
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Posts: 35,941
Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Lincoln Nebraska
the 7&1/4 & (A body) 8&3/4 both use 1&3/4" wide shoes & as you know the shoe width has to match the drum width & requires a backing plate offset matched to them but I was thinking the 8&3/4 outer seal retainer & therefore the housing flange had 5 studs/nuts & only 4 on the 7&1/4 but I ain't sure on that. something was diferent iirc & man I was just over there earlier today but had other business on my mind


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Re: Rear end swap 7 1/4"-8 3/4" [Re: RapidRobert] #1560314
01/08/14 04:27 AM
01/08/14 04:27 AM
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Park Forest, IL
slantzilla Offline
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Park Forest, IL
The '73 and up BBP 10" brakes off an A body 7-1/4 will bolt right on an 8-3/4 as long as the bearing to flange spacing is correct.


"Everybody funny, now you funny too."
Re: Rear end swap 7 1/4"-8 3/4" [Re: slantzilla] #1560315
01/08/14 11:47 AM
01/08/14 11:47 AM
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Posts: 41,071
Round Lake Beach, Illinoisy
Rhinodart Offline
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Round Lake Beach, Illinoisy
I found out B-Body backing plates are different than A-Body after I got a set back from a powder coater and he sent me the wrong plates back. Different width shoes as said above, the areas where the shoes ride is higher on A-Body plates.


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!






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