1966 SWB Step Rear Brake ID
 

Just finished up replacing rotors, calipers, lines etc on the front brakes which a PO had upgraded to 70's era 5-lug disks. Got parts for a '77 and they worked just fine.

Now I'm getting started on the drums in the rear which look like they've also been swapped at some point to 5-lugs. I don't know if the PO used parts from the same source as the front or not, so I'm looking for advice on what parts I need to be looking for to do a rebuild on the hardware.

The markings on the front of the drums are:
3989541
MAX DIA 11.09

A search for that number pulls up an eBay listing for 67-72 CHEVY TRUCK NOS Rear Brake Drums 3989541. Since that's the only result, besides a posting here about mismatching drums on a '71, I wanted to see if anyone has any further info on these.

Here are some pictures:

https://imgur.com/5K4aBlR.jpg
5-lug drum on rear-end.

https://imgur.com/Mvf8RhQ.jpg
Markings on 5-lug drum on rear-end, "3989541". Also has marked, "MAX DIA 11.09"

https://imgur.com/c9bzc8b.jpg
5-lug drum heat side heat sinks on rear-end.

https://imgur.com/zG1FIHD.jpg
Inner plate on rear drums.

https://imgur.com/aFZAfRc.jpg
Upper inner plate on rear drums.

https://imgur.com/dpo7N3C.jpg
Lower inner plate on rear drums.

https://imgur.com/chx7wZ8.jpg
Brake pads in rear drums.

https://imgur.com/QmfwusC.jpg
Inner hardware on rear drums (1).

https://imgur.com/dKKe6Sl.jpg
Inner hardware on rear drums (2).

Thanks.

Re: 1966 SWB Step Rear Brake ID
 

Those are just standard 2" rear drum brakes. I've done this a number of times. Most of if not all of the parts are the same for many years.

I used 1977 c-10 11" x 2" rear drum brakes for the parts. Part numbers from Rock Auto.

Drums: RAYBESTOS 2065R {#102065, 2065, F2065} Professional Grade; Outside Diameter 13.64" / 5 Bolts / Finned, Rear; w/ 11" X 2" Brakes

Shoes: RAYBESTOS 449PG {#449NR, 449RR} Professional Grade; Organic; 11.00 X 2.00, Rear; w/ 11" X 2" Brakes

Wheel Cylinders: RAYBESTOS WC37080 {#2037080} Professional Grade, Rear; w/ 11" X 2" Brakes

Hardware Kit: CARLSON H7046 Drum All-In-One Kit, Rear; 473
OR: CARLSON H2324 Pro Kit, Rear; 473

Pretty straight forward.

Re: 1966 SWB Step Rear Brake ID
 

Excellent. Thanks aggie91 for the info. That's going to make it a lot easier.