Factory six-lug discs ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dan-K · 09-02-2009, 04:49 PM

I recently purchased what I beleive to be a factory six-lug disc brake set up. They were on a 72 Cheyenne super. I have also heard this was an option on some GMC.s as well. What would have come from the factory with this set-up ? and what year?

northerngmc · 09-02-2009, 04:55 PM

Was it 4X4? Because a 2wd 72 1/2 ton should have 5 lug disk brakes.

Dan-K · 09-02-2009, 06:38 PM

It was two wheel drive. I really didnt believe him when I spoke to him on the phone but they are what they are. I thought they may have been old after-market but the calipers are G.M. marked.

**michael bustamante** · 09-02-2009, 06:41 PM

calipers might be gm, but the rotors are definatly going to be aftermarket is the rearend 6 lug also?

BarryB · 09-02-2009, 06:43 PM

First

to the board, BUT

Trust me somebody else would have done it, If I didn't.

Now seriously if you can post some pics of what your working with, I'm sure somebody can elaborate what you have. BUT like mentioned before. All the 71 72 I have seen are 5 lug disc brake set-up on the 1/2 ton trucks. and 8 lugs for the 3/4 ton trucks.

powell72 · 09-02-2009, 10:11 PM

Welcome neighbor, all 71 and up 2wd half ton trucks had 5-lug disc brakes, no exceptions, regardless if it's Chevy or GMC. It sounds like an aftermarket rotor.

Longhorn Man · 09-03-2009, 10:24 PM

bump

ChevLoRay · 09-03-2009, 11:09 PM

My ECE conversion from drums to discs is 6-lug. If I ever want to go to a 5-lug pattern, all I have to do is use the stock 5-lug rotors from GM or any other parts house. So, who's to say that someone didn't do the reverse and put some ECE (or other supplier) rotors on in place of the original 5-lug rotors?

**special-K** · 09-04-2009, 08:39 AM

6-lug 2wd disc brakes aren`t factory.No pre-71 disc brakes/No post`70 6-lug.All 71/72s are 5-lug disc.All 67-70s are drum.
that`s the gospel.

jorgensensc · 09-04-2009, 09:42 AM

Quote:

Originally Posted by ChevLoRay

My ECE conversion from drums to discs is 6-lug. If I ever want to go to a 5-lug pattern, all I have to do is use the stock 5-lug rotors from GM or any other parts house. So, who's to say that someone didn't do the reverse and put some ECE (or other supplier) rotors on in place of the original 5-lug rotors?

THey definitely could have. If they changed out the rear for some reason,maybe they needed a new one and found a 6 lug rear, or they wanted the narrower track width on the earlier rears, and then they change over to disc brakes via a kit, then maybe they decided to stick with the 6 lug stuff.

Also, wasn't there a 'how-to' on using 88+ chevy 6 lug stuff for a conversion on the front? I could have sworn I read that somewhere. Maybe the previous owner used that stuff, that would say GM on it too. Just some ideas.
Shawn

westofb · 09-04-2009, 09:58 AM

I think I saw a thread on here where someone got the front suspension off of like a 88 or so 3/4 ton chevy 2 wheel drive and it was a 6 lug set up. I believe the 6 lug 3/4 ton was only available for a couple of years if I am remembering right.

chevy_mike · 09-04-2009, 10:59 AM

I believe '88-'98 Light Duty 3/4 tons all had 6 lug, Heavy Duty 3/4 ton had 8 lug.

**special-K** · 09-04-2009, 08:28 PM

That`s a possibility...`88-up light C/20 parts.

Hottrucks · 09-04-2009, 08:38 PM

OK but the real ?? is how wide is it?? this maybe away to convert to disc and keep the skinny on things??

texanidiot25 · 09-04-2009, 11:08 PM

It's dirt easy to swap on the 73-87 heavy-halfton spindles, and with aftermarket 6 lug disks. There were no factory 6-lug disk 2wd trucks until the 88-97 era.

But, I run aftermarket 6 lug disks on 73-87 heavy halftone spindles/calipers.

tdave00 · 09-05-2009, 12:42 AM

Quote:

Originally Posted by westofb

I think I saw a thread on here where someone got the front suspension off of like a 88 or so 3/4 ton chevy 2 wheel drive and it was a 6 lug set up. I believe the 6 lug 3/4 ton was only available for a couple of years if I am remembering right.

Yep. You have to use a C-20 lower a arm to make the balljoint fit that spindle. I have it bookmarked somewhere. I'll try and find it.

Edit: Linky
http://67-72chevytrucks.com/vboard/s...d.php?t=353393

That's not the exact thread I was talking about but good information.

Longhorn Man · 09-06-2009, 10:25 AM

however, back to the original poste's question, if your truck is a 2 wheel drive 1/2 ton truck, there is no way it has original 6 lug disks. GM didn't start that on half tons till 1999.

Hottrucks · 09-06-2009, 08:43 PM

hey long horn has anyone tried to fit that spindle on to our old stuff..what kind of results if they did make it work??

Longhorn Man · 09-06-2009, 11:30 PM

no idea what so ever. I have no interest in 6 lug discs, so i never paid any attention.

**special-K** · 09-07-2009, 07:15 AM

It`s most practicle to just go ahead and buy the aftermarket discs and use knuckles that will bolt in,such as 71/72s.If you aren`t lowering you can buy someone`s cast-offs from their swap or,if you are lowering,buy the bolt-on kit.

Hottrucks · 09-07-2009, 08:41 AM

being bagged and cupped I really can't go to dropped spindles I'm about as low as I can go unless I just want to have alower ride height but thats not what I'm after ...I just want to up grade to better brakes...I may just add power and run it

**special-K** · 09-07-2009, 09:21 AM

I`d get someone who installed drop spindle`s original 71/72 spindle for very cheap to free,used 71/72 backing plates,rebuilt 71/72 calipers,new hoses,and aftermarket 6-lug discs.

09-02-2009, 04:49 PM	#1
Dan-K Registered User Join Date: Aug 2009 Location: Ft.Collins, Co. Posts: 105	Factory six-lug discs ? I recently purchased what I beleive to be a factory six-lug disc brake set up. They were on a 72 Cheyenne super. I have also heard this was an option on some GMC.s as well. What would have come from the factory with this set-up ? and what year?

09-02-2009, 04:55 PM	#2
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Factory six-lug discs ? Was it 4X4? Because a 2wd 72 1/2 ton should have 5 lug disk brakes. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

09-02-2009, 06:38 PM	#3
Dan-K Registered User Join Date: Aug 2009 Location: Ft.Collins, Co. Posts: 105	Re: Factory six-lug discs ? It was two wheel drive. I really didnt believe him when I spoke to him on the phone but they are what they are. I thought they may have been old after-market but the calipers are G.M. marked.

09-02-2009, 06:41 PM	#4
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,867	Re: Factory six-lug discs ? calipers might be gm, but the rotors are definatly going to be aftermarket is the rearend 6 lug also? __________________ 1967custom Last edited by michael bustamante; 09-02-2009 at 06:42 PM.

09-02-2009, 06:43 PM	#5
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Factory six-lug discs ? First to the board, BUT Trust me somebody else would have done it, If I didn't. Now seriously if you can post some pics of what your working with, I'm sure somebody can elaborate what you have. BUT like mentioned before. All the 71 72 I have seen are 5 lug disc brake set-up on the 1/2 ton trucks. and 8 lugs for the 3/4 ton trucks. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff! Last edited by BarryB; 09-02-2009 at 06:46 PM.

09-02-2009, 10:11 PM	#6
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: Factory six-lug discs ? Welcome neighbor, all 71 and up 2wd half ton trucks had 5-lug disc brakes, no exceptions, regardless if it's Chevy or GMC. It sounds like an aftermarket rotor. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html Last edited by powell72; 09-02-2009 at 10:14 PM.

09-03-2009, 10:24 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Factory six-lug discs ? bump

09-03-2009, 11:09 PM	#8
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Factory six-lug discs ? My ECE conversion from drums to discs is 6-lug. If I ever want to go to a 5-lug pattern, all I have to do is use the stock 5-lug rotors from GM or any other parts house. So, who's to say that someone didn't do the reverse and put some ECE (or other supplier) rotors on in place of the original 5-lug rotors? __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

09-04-2009, 08:39 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Factory six-lug discs ? 6-lug 2wd disc brakes aren`t factory.No pre-71 disc brakes/No post`70 6-lug.All 71/72s are 5-lug disc.All 67-70s are drum. that`s the gospel. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-04-2009, 09:58 AM	#11
westofb I really hate wet sanding! Join Date: Dec 2008 Location: Brookfield, MO Posts: 601	Re: Factory six-lug discs ? I think I saw a thread on here where someone got the front suspension off of like a 88 or so 3/4 ton chevy 2 wheel drive and it was a 6 lug set up. I believe the 6 lug 3/4 ton was only available for a couple of years if I am remembering right.

09-04-2009, 10:59 AM	#12
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: Factory six-lug discs ? I believe '88-'98 Light Duty 3/4 tons all had 6 lug, Heavy Duty 3/4 ton had 8 lug. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

09-04-2009, 08:28 PM	#13
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Factory six-lug discs ? That`s a possibility...`88-up light C/20 parts. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-04-2009, 08:38 PM	#14
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Factory six-lug discs ? OK but the real ?? is how wide is it?? this maybe away to convert to disc and keep the skinny on things?? __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

09-04-2009, 11:08 PM	#15
texanidiot25 Eat My Rust Join Date: Jan 2007 Location: Cypress, Texas Posts: 3,362	Re: Factory six-lug discs ? It's dirt easy to swap on the 73-87 heavy-halfton spindles, and with aftermarket 6 lug disks. There were no factory 6-lug disk 2wd trucks until the 88-97 era. But, I run aftermarket 6 lug disks on 73-87 heavy halftone spindles/calipers.

09-06-2009, 10:25 AM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Factory six-lug discs ? however, back to the original poste's question, if your truck is a 2 wheel drive 1/2 ton truck, there is no way it has original 6 lug disks. GM didn't start that on half tons till 1999.



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09-06-2009, 08:43 PM	#18
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Factory six-lug discs ? hey long horn has anyone tried to fit that spindle on to our old stuff..what kind of results if they did make it work?? __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

09-06-2009, 11:30 PM	#19
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Factory six-lug discs ? no idea what so ever. I have no interest in 6 lug discs, so i never paid any attention.

09-07-2009, 07:15 AM	#20
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Factory six-lug discs ? It`s most practicle to just go ahead and buy the aftermarket discs and use knuckles that will bolt in,such as 71/72s.If you aren`t lowering you can buy someone`s cast-offs from their swap or,if you are lowering,buy the bolt-on kit. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 09-07-2009 at 09:18 AM.

09-07-2009, 08:41 AM	#21
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: Factory six-lug discs ? being bagged and cupped I really can't go to dropped spindles I'm about as low as I can go unless I just want to have alower ride height but thats not what I'm after ...I just want to up grade to better brakes...I may just add power and run it

09-07-2009, 09:21 AM	#22
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Factory six-lug discs ? I`d get someone who installed drop spindle`s original 71/72 spindle for very cheap to free,used 71/72 backing plates,rebuilt 71/72 calipers,new hoses,and aftermarket 6-lug discs. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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