Brand new Centric drums don't fit?

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65Val

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Anyone heard that the new Centric SBP brake drums "lock up" the rear end when tightened down? I was talking with a gent on the FB "Early Valiant and Barracuda "page. He has a problem of new Centric SBP brake drums "locking against the backing plate when tightened down" on his '65 Barracuda's 7.25 rear end. Apparently, he's tried several sets, with the same result. He says the rear end is totally stock.

Anyone heard of this?
 
Too bad everybody junked their disk/ drum lathes. Would be a simple matter to turn some off the rear lip
 
Are your backing plates correct for the application?

10 x 1.75 vs 10x2
SBP VS BBP
 
Too bad everybody junked their disk/ drum lathes. Would be a simple matter to turn some off the rear lip
I still have my Ammco
Too bad everybody junked their disk/ drum lathes. Would be a simple matter to turn some off the rear lip
i still have my Ammco 4000 drum/rotor lathe with all the tooling.
 
So do I. The disk gearbox has a problem, you must hold it in gear, but I don't use it much
 
These drums worked fine on my 67 7 1/4 without any modification at all. Why would they have to be modified now?
Why are you asking me? I did not manufacture either the drums nor the rear axle or any parts of
 
Why are you asking me? I did not manufacture either the drums nor the rear axle or any parts of
Why are you asking me? I did not manufacture either the drums nor the rear axle or any parts of
Because you were the first to suggest they needed modifying, so I thought you could tell me why, when they work fine on my car.
 
Quick look couldn't find 10x1.75 rear drums anywhere.

Anyone else?
 
Anyone heard that the new Centric SBP brake drums "lock up" the rear end when tightened down? I was talking with a gent on the FB "Early Valiant and Barracuda "page. He has a problem of new Centric SBP brake drums "locking against the backing plate when tightened down" on his '65 Barracuda's 7.25 rear end. Apparently, he's tried several sets, with the same result. He says the rear end is totally stock.

Anyone heard of this?
You haven't stated the size of the brakes and the part number being used, but, it's possible he got front drums instead of rears. Fronts are wider and would hit the backing plate if tightened down. A simple measurement comparing the old drums to the new ones should tell the tale.
 
You haven't stated the size of the brakes and the part number being used, but, it's possible he got front drums instead of rears. Fronts are wider and would hit the backing plate if tightened down. A simple measurement comparing the old drums to the new ones should tell the tale.
I’ve asked him to measure the width of his new drums…awaiting answer.

Not sure how to post the whole convo from FB, but here’s where it is, if you want to check it out…

6B7E3B72-253B-4E9C-A443-D4DD181F01F5.png
 
You have the drums. You have the car and the rear end they fit on. You have everything there in front of you at your disposal to see why they don't fit correctly. It sounds like Del said, they simply need some of that inner lip trimmed back.
 
You have the drums. You have the car and the rear end they fit on. You have everything there in front of you at your disposal to see why they don't fit correctly. It sounds like Del said, they simply need some of that inner lip trimmed back.
Rusty… not my car… its a guy on FB that s having the problem.., Im just trying to help him out.Read up there^^^^^^
 
Rusty… not my car… its a guy on FB that s having the problem.., Im just trying to help him out.Read up there^^^^^^

Oh so you're not having the problem? Piss on it, then. LOL
 
Open your kids collage fund!

This is for 10x1.75 SBP Rear drums 7 1/4 or 8 3/4.
Screenshot_20210806-171340.png



oem part numbers
2534757 - 3004743 - 3580551
Screenshot_20210806-170959.png
 
I had this same problem on my Dart. Its not the backing plates. It's china junk. I had a machinist buddy cut 1/4 inch off the edge, and the little flange on the drum needs cutting back also. Check your measurements though. It's been a while since I did this.
 
I would also have a clean up cut done on the drums braking surface. Mine were making all kinds of racket, until I had them turned.
 
I had this same problem on my Dart. Its not the backing plates. It's china junk. I had a machinist buddy cut 1/4 inch off the edge, and the little flange on the drum needs cutting back also. Check your measurements though. It's been a while since I did this.
Funny thing… they went right on my 7.25, and later 8.75 in my Dart with no mods at all.
 
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