What are the size of the factory backing plates? - Pontiac GTO Forum
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What are the size of the factory backing plates?

Guys,

I'm about to order a new 12 bolt rear to replace the 10 bolt in my 70 GTO. I want to stay with the factory brake set up to minimize the installation hassle, with the e-brake and whatever. I'm looking for a new set of backing plates and the ones I have found seem to be for 9 1/2 brakes. Is that the factory brake set up? Planning on just transferring over all my brake components. Thanks for any help.

Mike
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Originally Posted by 70conv View Post
Guys,

I'm about to order a new 12 bolt rear to replace the 10 bolt in my 70 GTO. I want to stay with the factory brake set up to minimize the installation hassle, with the e-brake and whatever. I'm looking for a new set of backing plates and the ones I have found seem to be for 9 1/2 brakes. Is that the factory brake set up? Planning on just transferring over all my brake components. Thanks for any help.

Mike

My opinion here as I am not an expert on this, but the 12-bolt and 10 bolt will be different. The Pontiac 10-bolt uses a plate with 4-bolts to hold the axle in. The Chevy 12-bolt uses C-clips to hold the axles in. I am not sure if you can simply swap backing plates as the axle tube ends may be different as well as axle tube size - but just assuming at this point.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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