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11" rear drum brake backing plates

Started by b5cuda, November 14, 2020, 10:36:07 AM

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b5cuda

Looking for a pair of rear drum backing plates for 11" brakes (not 10" brakes).  Unrestored is fine, all I need is backing plates and e-brake strut/lever.  Thanks!

68bee

What size 11 x 2   11 x 2 1/2 or  11 x 3

b5cuda

Thanks for reply - my preference is 11 X 3, since i already have a set of 3" drums and matching shoes. 


autoxcuda

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Skdmark

The 3 inch rears were not standard on E-body, but are from a C-body.
Here's the part numbers for the 3 inch rears. Might help your search.
'70 2880648-9  for R and L
'71 3461986-7  for R and L

2-1/2 inch backing plates were more common and easier to come across.
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b5cuda

Thanks guys, really appreciate the tips!  I already have a set of 3" drums and shoes that came in a recent parts deal, so would be nice to use them if possible.  I'm guessing either depth will fit on the car and I'm not concerned about staying factory-correct on this restomod project.   

blown motor

I'm trying to learn something here. Doesn't 2 1/2 or 3" refer to the depth of the drum/width of the shoe? Why would the backing plate be different?
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anlauto

Quote from: blown motor on November 16, 2020, 06:52:09 AM
I'm trying to learn something here. Doesn't 2 1/2 or 3" refer to the depth of the drum/width of the shoe? Why would the backing plate be different?
I was thinking this too  :thinking:  but I guess if the axle and housing remain constant, the different off-set for the wider brakes has to come from somewhere :dunno:  I never thought there was a difference before reading this thread....learn something new everyday :worship:
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b5cuda

Yes, I'm getting educated too.  Evidently there are three different backing plates with 2.5 being the most common.

Skdmark

The backing plate offsets the different drum widths. So your drum to drum distance remains consistent regardless of brake width. If not, the factory would need to have more wheel options because the back spacing would have to provide the correction.

I've been looking into the different brake setups as I piece together an 8-3/4 setup for my Barracuda. Learning as I go too.
You are not entitled to your opinion. You are entitled to your informed opinion. No one is entitled to be ignorant.
-Harlan Ellison

(O OI====II====IO O)    (O O{]{]{] ][ [}[}[}O O)
:stayinlane:

68bee

I might have them just have to dig them out


b5cuda

Does anyone have a set of 11 x 3 rear drum backing plates available?  Would save me buying new drums and shoes - thanks!

cudaize

Quote from: b5cuda on November 16, 2020, 12:58:06 PM
Does anyone have a set of 11 x 3 rear drum backing plates available?  Would save me buying new drums and shoes - thanks!

If you want 3" rear backing plates you might want to go on a C-body website and see if anyone has them.  I think for the most part E-bodies had 11 X 2-1/2 in the rear.

b5cuda


68bee

I have the 11 x 3 backing plates and e brake parts. I sent you a message