rear brake drums - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zeke · 02-19-2006, 10:16 AM

I have a 81 GMC 2wd 1/2 ton donor truck to upgrade my 69 to PS/PB and it looks like the rear brake backing plate will bolt on to the 69 rear. What I want to know is would 81 4x4 drums match up with the backing plate?

Also, if I swap the 69 rear for the 81 (lot of work) would 4x4 axles fit the 2wd rearend?

The drums and discs are shot, I bought 6 lug discs from GMC Pauls for the front conversion and would like to upgrade the rear also. Trying to get some ideas/options before I head off in a direction I'll regret latter $$.

Thanks

**N2TRUX** · 02-19-2006, 12:35 PM

Zeke I'm going to copy this to the 67-72 forum. I think you will get a better response there...

**dennislbrooks** · 02-19-2006, 12:54 PM

I doubt if you will gain any rear braking power by switching to the 81 unless they are the HD type. You will have to deal with the emergency brake cables also. Do you have other reasons to switch to the 81 3rd member?

If you were closer I would give you a nice oem 67-72 rear brake setup as I went to disc on the rear,

junkyardjohn · 02-19-2006, 01:36 PM

I Bolted The Backing Plates & Complete Drum & Brake Assy. Off Of A 75 ONTO A 71 12 BOLT. They Were 2 5/8" Instead Of The 2" Wide Shoes That Came On Our Trucks. It Made A Very Noticable Difference.

John

**Boog** · 02-19-2006, 01:58 PM

ARe those 2 5/8" shoes the standard or heavy duty brakes in 75?

davidh · 02-19-2006, 02:22 PM

Doesn't classic enterprize offer upgrades for 71-2 rear brakes? Only thing is if you're keeping the 6lug you would have to have these redrilled or something.

Zeke · 02-19-2006, 02:43 PM

They are the HD type and I was trying to keep 6 lug. Since the drums/discs were shot on the 81 and I bought the 6 lug disc and was wondering if the 81 6 lug 4x4 drums would fit the 69 axle with 81 2wd backing plate.

I would rather not redrill the drums since I need new ones.

junkyardjohn · 02-19-2006, 04:02 PM

Quote:

Originally Posted by Boog

ARe those 2 5/8" shoes the standard or heavy duty brakes in 75?

THERE WAS NOTHING SPECIAL ABOUT THE 75. I THOUGHT THEY WERE ALL 2 5/8" WIDE IN LATER YEARS. IT WAS A NATURAL PROGRESSION OF BRAKE SHOES. I KNOW MY 82 1/2 TON HAS 2 5/8" WIDE SHOES & IT IS NOT A HEAVY DUTY MODEL & DOESN'T HAVE EXTRA HEAVY DUTY BRAKES.

JOHN
EVERY 2WD 1/2 TON AFTER 1970 HAD 5 LUGS.

02-19-2006, 10:16 AM	#1
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	rear brake drums I have a 81 GMC 2wd 1/2 ton donor truck to upgrade my 69 to PS/PB and it looks like the rear brake backing plate will bolt on to the 69 rear. What I want to know is would 81 4x4 drums match up with the backing plate? Also, if I swap the 69 rear for the 81 (lot of work) would 4x4 axles fit the 2wd rearend? The drums and discs are shot, I bought 6 lug discs from GMC Pauls for the front conversion and would like to upgrade the rear also. Trying to get some ideas/options before I head off in a direction I'll regret latter $$. Thanks __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

02-19-2006, 12:35 PM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: rear brake drums Zeke I'm going to copy this to the 67-72 forum. I think you will get a better response there... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

02-19-2006, 12:54 PM	#3
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,783	Re: rear brake drums I doubt if you will gain any rear braking power by switching to the 81 unless they are the HD type. You will have to deal with the emergency brake cables also. Do you have other reasons to switch to the 81 3rd member? If you were closer I would give you a nice oem 67-72 rear brake setup as I went to disc on the rear,

02-19-2006, 01:36 PM	#4
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: rear brake drums I Bolted The Backing Plates & Complete Drum & Brake Assy. Off Of A 75 ONTO A 71 12 BOLT. They Were 2 5/8" Instead Of The 2" Wide Shoes That Came On Our Trucks. It Made A Very Noticable Difference. John __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST Last edited by junkyardjohn; 02-19-2006 at 01:37 PM.

02-19-2006, 01:58 PM	#5
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,271	Re: rear brake drums ARe those 2 5/8" shoes the standard or heavy duty brakes in 75? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

02-19-2006, 02:22 PM	#6
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Re: rear brake drums Doesn't classic enterprize offer upgrades for 71-2 rear brakes? Only thing is if you're keeping the 6lug you would have to have these redrilled or something.

02-19-2006, 02:43 PM	#7
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: rear brake drums They are the HD type and I was trying to keep 6 lug. Since the drums/discs were shot on the 81 and I bought the 6 lug disc and was wondering if the 81 6 lug 4x4 drums would fit the 69 axle with 81 2wd backing plate. I would rather not redrill the drums since I need new ones. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin Last edited by Zeke; 02-19-2006 at 02:48 PM.



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