Unavailable parts... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hilandr452 · 04-10-2010, 01:29 PM

OK, Longhorn man was right. I can't find 13 x 2 1/2 inch rear drums for my 71 GMC 3500 longhorn. The drums I have are 1/2 inch past the maximum diameter, putting them in the "unsafe" category. Does anyone know where to get these? HELP!

Stano · 04-10-2010, 02:04 PM

Were these used on any other trucks? What rearend do you have? My friend has a ton 72 cab chassis with a dump bed and he had trouble finding drums for it but he did find drums new eventually. If you have rearend info I can ask him where he got his.

Stano · 04-10-2010, 02:34 PM

I called my friend and he got his through NAPA autoparts. Around here they do big truck and equipment parts. They were old stock though so it may be a bust. However we no longer have a NAPA store here in town for me to check for you. It may be worth a shot though.

hilandr452 · 04-10-2010, 02:44 PM

My local napa says they don't carry it anymore. It's the eaton rear end 410 ratio. ho52071 is the axle I believe.

Longhorn Man · 04-10-2010, 10:15 PM

HO72 in a one ton.
They stopped making these drums in the late 80's early 90's from what I was told. This rear is a GM made rear, with an eaton diff in the center. Only used in GM stuff.
Honestly, I would start looking for a 14 bolt... you can get geating better than 4.10 (in a 14 bolt) if you look for them.

capev86 · 04-10-2010, 10:35 PM

4.10 is a good ratio in a one ton truck....i am improving my ho52 in my 72 burb by doing the swap from a 4.57. all you need is a good overdrive and you are set. you don't want to lose low end in a heavy duty truck, unless you have a trans with a serious granny gear to make up the difference!

Zeke · 04-11-2010, 08:03 AM

Don't know much about this, but would backing plates from a newer rear end fit? Might be possible to change the whole set up to newer style with more parts available?
I put 81 rear brakes on my 69 to get better brakes without going to disc, parts are lots cheaper and available.

hilandr452 · 04-12-2010, 12:45 AM

I want to keep it original, so I put it back together with the bad drums for now until I can find something. Thanks for all the help guys and keep your eyes peeled. =o)

Dan

**Stocker** · 04-12-2010, 01:30 AM

Someone posted this site http://brakeperformance.com/site/brake_drums.php on here a while back and I bookmarked it, b/c my drums are getting thin. There's a toll-free number, 866-756-5536, if you haven't tried them already. Good luck!

04-10-2010, 01:29 PM	#1
hilandr452 Registered User Join Date: Jan 2009 Location: Colorado Springs, CO Posts: 357	Unavailable parts... OK, Longhorn man was right. I can't find 13 x 2 1/2 inch rear drums for my 71 GMC 3500 longhorn. The drums I have are 1/2 inch past the maximum diameter, putting them in the "unsafe" category. Does anyone know where to get these? HELP! __________________ Dan Smith Colorado Springs, CO 71 GMC Custom Camper "Longhorn" 454, TH400 73 Chevy Camper Special (Yes, it's badged a camper special) Flat Bed Motorhome conversion 454, standard tranny *"DON'T TREAD ON ME !!!"* My Project: http://www.picturetrail.com/sfx/album/view/20829244 , http://www.picturetrail.com/sfx/album/view/24654442

04-10-2010, 02:04 PM	#2
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	Re: Unavailable parts... Were these used on any other trucks? What rearend do you have? My friend has a ton 72 cab chassis with a dump bed and he had trouble finding drums for it but he did find drums new eventually. If you have rearend info I can ask him where he got his. __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

04-10-2010, 02:34 PM	#3
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	Re: Unavailable parts... I called my friend and he got his through NAPA autoparts. Around here they do big truck and equipment parts. They were old stock though so it may be a bust. However we no longer have a NAPA store here in town for me to check for you. It may be worth a shot though. __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

04-10-2010, 02:44 PM	#4
hilandr452 Registered User Join Date: Jan 2009 Location: Colorado Springs, CO Posts: 357	Re: Unavailable parts... My local napa says they don't carry it anymore. It's the eaton rear end 410 ratio. ho52071 is the axle I believe. __________________ Dan Smith Colorado Springs, CO 71 GMC Custom Camper "Longhorn" 454, TH400 73 Chevy Camper Special (Yes, it's badged a camper special) Flat Bed Motorhome conversion 454, standard tranny *"DON'T TREAD ON ME !!!"* My Project: http://www.picturetrail.com/sfx/album/view/20829244 , http://www.picturetrail.com/sfx/album/view/24654442

04-10-2010, 10:15 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Unavailable parts... HO72 in a one ton. They stopped making these drums in the late 80's early 90's from what I was told. This rear is a GM made rear, with an eaton diff in the center. Only used in GM stuff. Honestly, I would start looking for a 14 bolt... you can get geating better than 4.10 (in a 14 bolt) if you look for them.

04-10-2010, 10:35 PM	#6
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: Unavailable parts... 4.10 is a good ratio in a one ton truck....i am improving my ho52 in my 72 burb by doing the swap from a 4.57. all you need is a good overdrive and you are set. you don't want to lose low end in a heavy duty truck, unless you have a trans with a serious granny gear to make up the difference!

04-11-2010, 08:03 AM	#7
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: Unavailable parts... Don't know much about this, but would backing plates from a newer rear end fit? Might be possible to change the whole set up to newer style with more parts available? I put 81 rear brakes on my 69 to get better brakes without going to disc, parts are lots cheaper and available. __________________ 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

04-12-2010, 12:45 AM	#8
hilandr452 Registered User Join Date: Jan 2009 Location: Colorado Springs, CO Posts: 357	Re: Unavailable parts... I want to keep it original, so I put it back together with the bad drums for now until I can find something. Thanks for all the help guys and keep your eyes peeled. =o) Dan __________________ Dan Smith Colorado Springs, CO 71 GMC Custom Camper "Longhorn" 454, TH400 73 Chevy Camper Special (Yes, it's badged a camper special) Flat Bed Motorhome conversion 454, standard tranny *"DON'T TREAD ON ME !!!"* My Project: http://www.picturetrail.com/sfx/album/view/20829244 , http://www.picturetrail.com/sfx/album/view/24654442

04-12-2010, 01:30 AM	#9
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,586	Re: Unavailable parts... Someone posted this site http://brakeperformance.com/site/brake_drums.php on here a while back and I bookmarked it, b/c my drums are getting thin. There's a toll-free number, 866-756-5536, if you haven't tried them already. Good luck! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 04-12-2010 at 01:33 AM.



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