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  finding correct backing plate/drums

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Author Topic:   finding correct backing plate/drums

Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 03-23-2001 12:22 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
I have a mess. Took a rear out of a 64.5 Mustang to be set up for my 66. Guy at the shop didn't like the looks of it (it was pretty rusted out and a wheel bearing was broken) so he sold me one that had come out from under another Mustang (lengths were right). He didn't know the origin of it and didn't have any drums or backing plates. The rear is not tapered at the ends (like the one from the Mustang), so the mounting plates/U-bolts off the Mustang don't fit either. I'm going junkyarding tomorrow but am stuck trying to figure out what I need.

What are the defining measurements I need to get the right brake components? I'll order drums but have no idea what to order. I know that the large hole in the drum needs to be 2.75 inches to fit the axle, but are the lug patterns the same among 5-lug drums? Also, how variable are backing plates? Figure the plate will need to line up with the four lugs that secure the axle- anything else?


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Posts: 2205
From: in the RV, moving soon from SC to VA
Registered: Jun 2000

posted 03-23-2001 01:02 PM     Click Here to See the Profile for sigtauenus   Click Here to Email sigtauenus     Edit/Delete Message   Reply w/Quote
I may be wrong on this, but whether the tube tapers or not should not matter as far as backing plates go. there is at least a 25-30 year period where just about all backing plates will interchange perfect, meaning, hole for the axle, bolt holes, brake cylinder holes, etc. They're almost all the same.

Have you already tried putting on your existing backing plates on it, or did you just assume they wouldn't fit?

As far as mounting plates/u-bolts, there are several different sizes which is obviously affected by the tapering of the tube. I would suspect that most 9" rears had bigger tubes and the hardware you need, or find an 8" that matches...hit the junk yard with a ruler.

As far as drums go, I know Ford has at least two different 5-bolt patterns, the smaller one for cars, the larger one for trucks.

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Posts: 42859
From: Saco, Maine
Registered: May 99

posted 03-23-2001 01:17 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Your rear end is probably from a {I think} '66 up Mustang, I believe the tapered axle housing was from a '65. {Right, Alex?}

If you use a standard {10x2} set of brake, the drums and backing plates will be easy to find. My Herd interchange manual lists:
62-65 Fairlane
63-67 Comet
68-71 Torino/Fairlane/Montego
67-72 Cougar
65-72 Mustang
63-70 Falcon
70-72 Maverick
71-72 Comet
62-63 Meteor

The car 5 bolt patterns are all the same for Fords.

Feel better now?

'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"

[This message has been edited by SteveLaRiviere (edited 03-23-2001).]

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Posts: 246
From: Baton Rouge, LA
Registered: Jul 99

posted 03-23-2001 02:09 PM     Click Here to See the Profile for project66   Click Here to Email project66     Edit/Delete Message   Reply w/Quote
I do feel better, thanks Steve. I was most worried about the lug pattern.

Sounds like I can snag backing plates from just about anything and buy drums to match. Just need to find a car with the 2-3/4" hole in the drum. I kept the drums off the 64.5 rear but they have a 2-3/8" hole. Hoping also to move up to a 10X2" drum.

Sig, the backing plates from the 64.5 rear went back to the junkyard with the rear. Like an idiot, I didn't measure them. Seemed to me that, with the taper, the hole in the plate would be smaller. Maybe they're still where I dropped them and I can have a look tomorrow.

thanks again for the help
Jim O

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