New Rear Drums - Help with what size to order - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Yamariv · 11-27-2022, 09:54 PM

Just about to pull the trigger on a set of drums from Rock Auto and am worried about getting the right size.

The ones I have chosen say 11x2", the other options don't say a size. I have the base model truck with a 5 bolt wheel and a 12 bolt rear end.

I've just removed a rear tire and measured across the front of the drum and I get about 11.75 inches. The drum depth is almost 4 inches.

Is this the right size to order? Or is the stock size the drums with no measurements in the listing?

KQQL IT · 11-27-2022, 09:56 PM

The brake shoe width

Yamariv · 11-27-2022, 10:27 PM

Quote:

Originally Posted by KQQL IT

The brake shoe width

So would 11x2" inch be the right size for my setup?

**Steeveedee** · 11-27-2022, 10:42 PM

Is it possible for you to take a brake drum to a local store and tell them what you have, along with the drum? Maybe take both drums and the shoes along so that they can figure out what you have?

**3757chevy** · 11-27-2022, 11:39 PM

If you take a drum off measure across the shoes and the width of the shoe or you can measure inside the drum the diameter and the depth where the shoe has been riding. I hope this helps.

franken · 11-28-2022, 01:17 AM

NAPA shows one drum for a 1971 Chevy C10 so I wonder if there's an issue.

**Ironangel** · 11-28-2022, 01:53 AM

The 71 and 72 C/10's with the 12-bolt axle have 11" drums with 2" shoes...5x5 lug pattern.

**3757chevy** · 11-28-2022, 01:57 AM

I only think they used 11x2 on both C10 5 lug and K10 6 lug . I don't remember other sizes used that year.

**Ironangel** · 11-28-2022, 01:58 AM

Quote:

Originally Posted by Yamariv

So would 11x2" inch be the right size for my setup?

Yes, as long as the factory 12-bolt axle is still there, you should be good to go with 11" drums with five lug holes. The brake shoes are 2" wide.

Yamariv · 11-28-2022, 03:25 PM

Quote:

Originally Posted by Ironangel

Yes, as long as the factory 12-bolt axle is still there, you should be good to go with 11" drums with five lug holes. The brake shoes are 2" wide.

Awesome, thank you gentlemen for all your help!! Yup 12 bolt is still there, 5 lug tires

Ill order those up!

**HO455** · 11-28-2022, 03:55 PM

Personally I would measure them. I have swapped numerous rear brake set ups over the years to improve braking. Your truck is 50 years old and things may have been swapped somewhere along the line.

72SB · 11-28-2022, 03:58 PM

might want to order new wheel cylinders also...or rebuild kit and hone yours. IMHO they are fairly cheap so just get new ones. I also got my 72, 5 lug rear brakes from RA

If the center soft line is old, replace it also

Yamariv · 11-28-2022, 05:27 PM

Quote:

Originally Posted by 72SB

might want to order new wheel cylinders also...or rebuild kit and hone yours. IMHO they are fairly cheap so just get new ones. I also got my 72, 5 lug rear brakes from RA

If the center soft line is old, replace it also

Oh yeah for sure, I'm doing the full brakes, wheel cylinders and center brake line. Everything in the front too, calipers, disks etc. 50 years, time for some new stuff

11-27-2022, 09:54 PM	#1
Yamariv Registered User Join Date: Oct 2022 Location: Regina, Saskatchewan Posts: 343	New Rear Drums - Help with what size to order Just about to pull the trigger on a set of drums from Rock Auto and am worried about getting the right size. The ones I have chosen say 11x2", the other options don't say a size. I have the base model truck with a 5 bolt wheel and a 12 bolt rear end. I've just removed a rear tire and measured across the front of the drum and I get about 11.75 inches. The drum depth is almost 4 inches. Is this the right size to order? Or is the stock size the drums with no measurements in the listing? __________________ 1971 Chev C10 - 250ci L6 w/3 speed on the floor Upgrades: Power Steering 3 Core Radiator 7 Hole Gauge Cluster Power Brakes (Incoming!!..) 1971 350 (Incoming!!..)

11-27-2022, 09:56 PM	#2
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,259	Re: New Rear Drums - Help with what size to order The brake shoe width __________________ " That didnt make it any newer " " Dont antique the equipment "

11-27-2022, 10:42 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,708	Re: New Rear Drums - Help with what size to order Is it possible for you to take a brake drum to a local store and tell them what you have, along with the drum? Maybe take both drums and the shoes along so that they can figure out what you have? __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

11-27-2022, 11:39 PM	#5
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,070	Re: New Rear Drums - Help with what size to order If you take a drum off measure across the shoes and the width of the shoe or you can measure inside the drum the diameter and the depth where the shoe has been riding. I hope this helps. Attached Images __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

11-28-2022, 01:17 AM	#6
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,127	Re: New Rear Drums - Help with what size to order NAPA shows one drum for a 1971 Chevy C10 so I wonder if there's an issue.

11-28-2022, 01:53 AM	#7
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: New Rear Drums - Help with what size to order The 71 and 72 C/10's with the 12-bolt axle have 11" drums with 2" shoes...5x5 lug pattern. __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

11-28-2022, 01:57 AM	#8
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,070	Re: New Rear Drums - Help with what size to order I only think they used 11x2 on both C10 5 lug and K10 6 lug . I don't remember other sizes used that year. __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

11-28-2022, 03:55 PM	#11
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,382	Re: New Rear Drums - Help with what size to order Personally I would measure them. I have swapped numerous rear brake set ups over the years to improve braking. Your truck is 50 years old and things may have been swapped somewhere along the line. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

11-28-2022, 03:58 PM	#12
72SB Registered User Join Date: Apr 2022 Location: Moorpark, CA Posts: 775	Re: New Rear Drums - Help with what size to order might want to order new wheel cylinders also...or rebuild kit and hone yours. IMHO they are fairly cheap so just get new ones. I also got my 72, 5 lug rear brakes from RA If the center soft line is old, replace it also



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