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**aotte1** · 12-25-2015, 01:08 PM

Lostmy65, also researching 12 bolt drum brake options, thinking of changing my 65 rear brakes to the newer 12 bolt heavy duty "JB 5" brake package. Just starting to see if it will work. Looks like the backing plates are different from earlier ones, offset to the center of truck to account for the wider brakes shoes. As notes here before by Keith Seymore, this is one of GM's really good brake systems, used as a design goal for trucks.

Any information/can it be done, on retrofitting rear JB 5 brakes to the early 12 bolt 2" brake shoe axles?

Note: using '79 Dana 44 front axle, with the JB 5 brakes. I am planning to use the complete JB 5 brake system on '64 K10 build. Keeping all the original '64 parts so they could be retorfit later.

Les

12-25-2015, 01:08 PM	#23
aotte1 Senior Member Join Date: Oct 2013 Location: lousiville Ky Posts: 2,637	Re: ???Drum Brake Assembly??? Lostmy65, also researching 12 bolt drum brake options, thinking of changing my 65 rear brakes to the newer 12 bolt heavy duty "JB 5" brake package. Just starting to see if it will work. Looks like the backing plates are different from earlier ones, offset to the center of truck to account for the wider brakes shoes. As notes here before by Keith Seymore, this is one of GM's really good brake systems, used as a design goal for trucks. Any information/can it be done, on retrofitting rear JB 5 brakes to the early 12 bolt 2" brake shoe axles? Note: using '79 Dana 44 front axle, with the JB 5 brakes. I am planning to use the complete JB 5 brake system on '64 K10 build. Keeping all the original '64 parts so they could be retorfit later. Les