Quote:
Originally Posted by aotte1
Continuing to research this upgrade, and found the brake shoe frame design chaned in '78. The size of the lining and drum stayed the same. However, '77 and older used a different brake shoe frame design, along with likely different internal parts too. The holes in the brake shoe frame are different between '77 and older, and '78 and up.
Still researching if their are differences in backing plates between '72 and Earlies 80s, along with C and K vehicles.
Jimmy, using K drums for 6 lugs.
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I looked into this some more too. All the parts of the brake system are the same part numbers EXCEPT for the shoes. The wheel cylinders, drums and hardware kits are all the same. Here is a pic of the backing plates with shoes and hardware that I believe are from a 1977 pickup.
Best as I can tell the '78 up shoes are missing the two smaller holes seen in the shoe frame in the pic above. All the hardware attachment holes appear to be the same. The parts store did not have the '77 shoes in stock, but had the '78 shoes and here is a pic of those:
