12" drums for 72 C10? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NH 72 · 01-23-2009, 08:11 PM

I'm trying to locate a source for backing plates to convert my stock rear drums to the '67 to '75 station wagon,taxi, police car optional 12x2 rear drums. Has anyone done this swap and do you know of a source for the backing plates.
TGIF
Chris in NH

Andy4639 · 01-23-2009, 08:14 PM

Sorry can't help you but would like to know the answer myself. Sounds like a good upgrade for the 71 rear end since I can't afford the disc upgrade.

*project 67 sub* · 01-24-2009, 05:31 AM

dont know if it will help or not but i put the whole rear drum setup off a 76 c10 on my 71 or 72 rear end

72armyswbtruck · 01-24-2009, 12:09 PM

What rear end do you have currently?
What year truck is yours? 72?
Why the switch from the 11" or 12" to the 12x2?

*project 67 sub* · 01-26-2009, 12:09 AM

my truck is a 67 suburban with a 71-2 c10 rearend.
the switch was because the original brakes for the 71-2 rearend were no good, and the drums i had off the rearend from my 76 had good brake springs, drums, new shoes, and new wheel cylinders in them so i just switched everything over when i did the rear end swap

NH 72 · 01-29-2009, 07:41 PM

Thanks for the replies. The truck is a 72 with a 12 bolt, I use it to haul my vintage race bikes and my camp trailer to the track. The rear brakes need overhauling and I'd like to upgrade them. Drums are more effective for trailer hauling / stopping and cheaper then a disc setup. Bigger is better and it's a bolt on, if I can find the backing plates. The rest of the parts are available. If I had the Part numbers then it would be easier to locate them. In the meantime I'll just keep turning over rocks.
Chris in NH

*project 67 sub* · 01-30-2009, 03:32 AM

look at your local recking yards for parts(ie: backing plates etc.). they should all work from a 73-87c10 truck. and 73-91 blazer, jimmy, and suburban

grayw0lf · 01-30-2009, 10:02 AM

You could also go the other route... 11 x 2.75" HD rear drums. They're not as tall, but definately wider. There are a few good threads on here w/ detailed donor lists if you search.

**bignbad** · 01-31-2009, 10:13 AM

i have a set of rea backing plants off of a '72 k20 unsure of the size of hand i'll later on today.Actualy i have 2 sets 1 0f the '72 eaton rear and the other is off a mid '70's truck 14 bolt ff.I check the size and get back to you.

NH 72 · 02-07-2009, 01:44 PM

Hmmm, maybe I need to be more specific. The '67 ?-'75 taxi, police and station wagon heavy duty brakes were a 5 on 5 bolt pattern with 12" by 2" brake shoes. An easy bolt on! They require 12" backing plates and drums. All of the parts except the backing plates seem to be available from local suppliers. I'd like to do this upgrade if I can find the backing plates. I tried to get the part number for them from my local Chevy dealer, but his parts books only go back to the early 80's. It would make it easier to locate or authenticate the plates if I could find that part #. I haven't done a wrecking yard search yet but I will in the near future. If they're un-obtanium then I'll just rebuild my existing set up. Thanks for the replies so far.
Chris in NH

01-23-2009, 08:11 PM	#1
NH 72 Registered User Join Date: Jan 2009 Location: Acworth, NH Posts: 6	12" drums for 72 C10? I'm trying to locate a source for backing plates to convert my stock rear drums to the '67 to '75 station wagon,taxi, police car optional 12x2 rear drums. Has anyone done this swap and do you know of a source for the backing plates. TGIF Chris in NH

01-23-2009, 08:14 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: 12" drums for 72 C10? Sorry can't help you but would like to know the answer myself. Sounds like a good upgrade for the 71 rear end since I can't afford the disc upgrade. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-24-2009, 05:31 AM	#3
project 67 sub Account Suspended Join Date: Mar 2007 Location: san bernardino ca. everywhere Posts: 3,938	Re: 12" drums for 72 C10? dont know if it will help or not but i put the whole rear drum setup off a 76 c10 on my 71 or 72 rear end

01-24-2009, 12:09 PM	#4
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,034	Re: 12" drums for 72 C10? What rear end do you have currently? What year truck is yours? 72? Why the switch from the 11" or 12" to the 12x2? __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

01-26-2009, 12:09 AM	#5
project 67 sub Account Suspended Join Date: Mar 2007 Location: san bernardino ca. everywhere Posts: 3,938	Re: 12" drums for 72 C10? my truck is a 67 suburban with a 71-2 c10 rearend. the switch was because the original brakes for the 71-2 rearend were no good, and the drums i had off the rearend from my 76 had good brake springs, drums, new shoes, and new wheel cylinders in them so i just switched everything over when i did the rear end swap

01-29-2009, 07:41 PM	#6
NH 72 Registered User Join Date: Jan 2009 Location: Acworth, NH Posts: 6	Re: 12" drums for 72 C10? Thanks for the replies. The truck is a 72 with a 12 bolt, I use it to haul my vintage race bikes and my camp trailer to the track. The rear brakes need overhauling and I'd like to upgrade them. Drums are more effective for trailer hauling / stopping and cheaper then a disc setup. Bigger is better and it's a bolt on, if I can find the backing plates. The rest of the parts are available. If I had the Part numbers then it would be easier to locate them. In the meantime I'll just keep turning over rocks. Chris in NH

01-30-2009, 03:32 AM	#7
project 67 sub Account Suspended Join Date: Mar 2007 Location: san bernardino ca. everywhere Posts: 3,938	Re: 12" drums for 72 C10? look at your local recking yards for parts(ie: backing plates etc.). they should all work from a 73-87c10 truck. and 73-91 blazer, jimmy, and suburban

01-30-2009, 10:02 AM	#8
grayw0lf Registered User Join Date: Apr 2004 Location: Clanton, AL Posts: 1,253	Re: 12" drums for 72 C10? You could also go the other route... 11 x 2.75" HD rear drums. They're not as tall, but definately wider. There are a few good threads on here w/ detailed donor lists if you search. __________________ 85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal!

01-31-2009, 10:13 AM	#9
bignbad Registered User Join Date: Jan 2009 Location: highspire,pa Posts: 423	Re: 12" drums for 72 C10? i have a set of rea backing plants off of a '72 k20 unsure of the size of hand i'll later on today.Actualy i have 2 sets 1 0f the '72 eaton rear and the other is off a mid '70's truck 14 bolt ff.I check the size and get back to you. __________________ '72 chevy k20 '06 H-D Springer softail http://www.bluemooncruisers.com/ http://www.enginecycle.com/ ~Eric

02-07-2009, 01:44 PM	#10
NH 72 Registered User Join Date: Jan 2009 Location: Acworth, NH Posts: 6	Re: 12" drums for 72 C10? Hmmm, maybe I need to be more specific. The '67 ?-'75 taxi, police and station wagon heavy duty brakes were a 5 on 5 bolt pattern with 12" by 2" brake shoes. An easy bolt on! They require 12" backing plates and drums. All of the parts except the backing plates seem to be available from local suppliers. I'd like to do this upgrade if I can find the backing plates. I tried to get the part number for them from my local Chevy dealer, but his parts books only go back to the early 80's. It would make it easier to locate or authenticate the plates if I could find that part #. I haven't done a wrecking yard search yet but I will in the near future. If they're un-obtanium then I'll just rebuild my existing set up. Thanks for the replies so far. Chris in NH



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