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Author
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Topic: Backing plates
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 04-08-2003 03:49 PM
   
I don't know if anyone remembers, but a while ago we were talking about swapping 10 x 2 1/2" rear drums on a 9 inch rear. I mentioned I put a set off a '70 Torino wagon on the back of my Sprint and I had to use the backing plates off the Torino. A 'certain' Ford expert here told me I was crazy and they all used the same backing plates.  Well, I came across some info that might be helpful to somebody... There were three different backing plates used on the 8-9" Ford rears with 10" drums, all designed with different offsets to accommodate different widths of 10" brake drums. Two ways to identify them are by the depth of the reinforcement ribbing on the plates, {the wider drums have the deepest ribbing} and the height of the backing plate if you lay them down on a bench. {I'll refer to that as offset of backing plate} Drum Width ----------- Offset of backing plate
2 1/2" -------------- 1 9/16"
2" ------------------ 1 1/2"
1 3/4" --------------- 1 7/16" There are also Torino 11 x 2 1/2" and 11 x 2 1/4" rear drums out there. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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bifs66
Gearhead Posts: 178
From: Maryland
Registered: Apr 2000
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posted 04-08-2003 04:06 PM
Steve,
I bought a 9" (4:11s) complete rear axle many years ago out of a 68 Mustang that was claimed to be a from a Cobra Jet car. I couldn't tell if this was true or not. Anyway, I installed the rear in the 66 Fastback. The 9" brakes were 2 1/2". From a recent article in a rodder magazine, I have identified the drums as those that came on the early Shelbys. When I rebuilt those brakes prior to the axle install, I could tell that the backing plates were visually different than the original 8" 1 3/4" backing plates. Also, the wheel cylinders were larger bore too. Obviously, the backing plates absorb the extra width of the brake drum so the overall width of the rear is the same regardless of the width of the drums.------------------
Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)
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Ryan Wilke
Gearhead Posts: 1570
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 04-08-2003 04:28 PM
Good Information, Steve.
Thanks for sharing! I suspect you'll stick this thread in the Brakes archive file, or should I print this off? Ryan 
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 04-08-2003 04:36 PM
Yeah, I'll stick it!  I'll wait a bit in case anyone else has stuff to add, like Bernie. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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MLariviere
Moderator Posts: 3525
From: Biddeford,Me.USA
Registered: May 99
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posted 04-09-2003 09:52 PM
The 11" drums are on the 72-up big Fords. These are the big bearing axles. The center hole in the drum,and axle stub will be bigger while the bolt circle remains the same.
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68 S-code GT
Gearhead Posts: 1175
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 04-11-2003 07:32 AM
 Another thing to look for while I search through the swap meets over the next few weeks!
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PonyDoc
Journeyman Posts: 93
From: Ft. Lauderdale
Registered: Jun 2001
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posted 04-13-2003 01:08 AM
I was doing some research about these and found that Ford also put 10X2 1/2 brakes on the fronts of a lot of cars. The shoes and wheel cyliners were the same as the rears (drums were obviously different), which makes finding the wheel cyl's and shoes easy and the ones down here are still cheap!
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DidgeyTrucker
Gearhead Posts: 1100
From: Greenbrier, TN USA
Registered: Oct 99
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posted 04-13-2003 11:04 AM
But try finding 10x2-1/2 rear drums with the correct early "small" center bore.Here's a tip: nearly all parts on the Shelby Mustangs were standard off the shelf Ford parts. Only the body panels were Shelby specific. Those 10x2-1/2 brakes on the '65 and '66 Shelbys were standard on other Ford products like '65 Fairlane wagons and '65 Econolines with 8" rear ends. The Galaxies mentioned in the articles about Shelby rear ends had 11" brakes. Tracy
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