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[GMCnet] r Are the four rear backing plates, and brake drums interchangeable between 73, and 78? [message #332276] Fri, 18 May 2018 16:39 Go to next message
BobDunahugh is currently offline  BobDunahugh   United States
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Someone I know bought a 78 with BIG rust holes in the backing plates. And big chunks of the brake drums gone due to extreme rust. I have the four off my 73. Bob Dunahugh
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Re: [GMCnet] r Are the four rear backing plates, and brake drums interchangeable between 73, and 78? [message #332283 is a reply to message #332276] Fri, 18 May 2018 19:03 Go to previous message
Matt Colie is currently offline  Matt Colie   United States
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BobDunahugh wrote on Fri, 18 May 2018 17:39
Someone I know bought a 78 with BIG rust holes in the backing plates. And big chunks of the brake drums gone due to extreme rust. I have the four off my 73. Bob Dunahugh

Bob,

You are sure to love this answer.....
Maybe.
There was a recall. GM sent dealers loaded backing plates to put on 73, 74, and some 75 coaches (as nearly as I have been able to determine).
This was along with a rear spindle upgrade.

So, if that 73 got the upgrade, then they should be interchangeable.
Someplace in the files of GMC data is a discussion of this upgrade. I believe it can be identified by looking at the external face of the brake drums.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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