Brake Changes on A Bodies
Probably 10” fronts with 9” rears. But the max diameter is cast right into the outside of the drums, that’ll give you the basic diameter.
This is the factory TSB on the redesigned 10” drums for the front on the A-bodies. November ‘72 everything had been changed over per the TSB, so the front drums had gone to a redesigned B body style brake- large upper ball joints, 10” drum with a larger outer wheel bearing. They still used the small bolt pattern.
https://www.hamtramck-historical.com/images/TSBs/1973/05-03-73C page1.jpg
‘73+ only /6 cars came with front drums, all the V8 cars got front disks standard ‘73+. And the drums went 10” front, 9” rear.
I’m not gonna argue what somebody saw. All the 9” drum spindles used a small upper ball joint. But 73+, after November ‘72 according to Ma Mopar (TSB), they would have been large ball joint UCA’s on both the disk and drum cars, no more small ball joint UCA’s after that. Now we all know Ma Mopar wasn’t great about dates, so, maybe some small ball joint UCA’s went out after that using up the discontinued leftover parts. But we’d be talking within weeks or months of the TSB, not years.
Probably 10” fronts with 9” rears. But the max diameter is cast right into the outside of the drums, that’ll give you the basic diameter.
This is the factory TSB on the redesigned 10” drums for the front on the A-bodies. November ‘72 everything had been changed over per the TSB, so the front drums had gone to a redesigned B body style brake- large upper ball joints, 10” drum with a larger outer wheel bearing. They still used the small bolt pattern.
https://www.hamtramck-historical.com/images/TSBs/1973/05-03-73C page1.jpg
‘73+ only /6 cars came with front drums, all the V8 cars got front disks standard ‘73+. And the drums went 10” front, 9” rear.
I’m not gonna argue what somebody saw. All the 9” drum spindles used a small upper ball joint. But 73+, after November ‘72 according to Ma Mopar (TSB), they would have been large ball joint UCA’s on both the disk and drum cars, no more small ball joint UCA’s after that. Now we all know Ma Mopar wasn’t great about dates, so, maybe some small ball joint UCA’s went out after that using up the discontinued leftover parts. But we’d be talking within weeks or months of the TSB, not years.
