6 lug front disc - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eastcoastcivil · 08-21-2010, 12:30 AM

I want to change my 67 to disk but not sure if I wan't to change the spindles. I could put 6 lug disc but everyone says its hard to get parts if you break down and thats why they switch to 5 lug. Wouldn't the only difference between 5 lug and 6 lug disc be the number of lugs on the rotor? or am I completely out to lunch?

I have a lead on a pair of 6 lug rotors and am also wondering if the caliper set up would be the same as a 5 lug and all I need is the rotors?

raycow · 08-21-2010, 01:03 AM

I'm not aware of any 6 lug rotor that will work with your stock 67 spindles. The usual way to do a disc conversion on these trucks is to use aftermarket spindles or stock spindles from a 71-87 truck. The main difference is that the aftermarket spindles let you keep your stock balljoints and tierod ends. Both of these spindles take the stock 5 lug rotors, but there is an aftermarket 6 lug rotor that is a direct replacement for the 1-1/4" thick 5 lug. This 6 lug rotor was never used as a factory part by GM.

There is a different 6 lug rotor that was a factory part on 88-98 trucks. This one requires 88-98 spindles and will not work with the earlier spindles.

All of this is explained with much greater detail in this thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=367260

Ray

72BlckButy · 08-21-2010, 11:37 AM

If you currently have drum brakes, you must swap spindles to install disc brakes; there's no other way to do it.

I have 6-lug disc brakes on my truck and considered changing to 5-lug but didn't want to have to change the rear. Once you have the correct spindles (either stock or drop) the only difference is the rotor; one will have a 5-lug setup and the other a 6-lug, the rest of the parts will work with either setup.

raycow · 08-21-2010, 01:18 PM

Quote:

Originally Posted by 72BlckButy

If you currently have drum brakes, you must swap spindles to install disc brakes; there's no other way to do it.

Well, actually there is a way. Several vendors sell a bracket and bearing spacer kit that allows you to install a CAR disc setup (5 on 4-3/4") on the original drum spindles. Howrever, I am not aware of anyone offering a way to install the stock TRUCK discs, either 5 or 6 lug.
http://www.performanceonline.com/196...LUG-WBK5-6370/

Ray

72BlckButy · 08-21-2010, 01:56 PM

That is true, and CPP offers a modified bracket, but IMO, there's not better (or safer) way.

08-21-2010, 12:30 AM	#1
eastcoastcivil Registered User Join Date: Apr 2007 Location: New Brunswick, Canada Posts: 201	6 lug front disc I want to change my 67 to disk but not sure if I wan't to change the spindles. I could put 6 lug disc but everyone says its hard to get parts if you break down and thats why they switch to 5 lug. Wouldn't the only difference between 5 lug and 6 lug disc be the number of lugs on the rotor? or am I completely out to lunch? I have a lead on a pair of 6 lug rotors and am also wondering if the caliper set up would be the same as a 5 lug and all I need is the rotors? __________________ If your not living for something, your dieing for nothing...

08-21-2010, 01:03 AM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: 6 lug front disc I'm not aware of any 6 lug rotor that will work with your stock 67 spindles. The usual way to do a disc conversion on these trucks is to use aftermarket spindles or stock spindles from a 71-87 truck. The main difference is that the aftermarket spindles let you keep your stock balljoints and tierod ends. Both of these spindles take the stock 5 lug rotors, but there is an aftermarket 6 lug rotor that is a direct replacement for the 1-1/4" thick 5 lug. This 6 lug rotor was never used as a factory part by GM. There is a different 6 lug rotor that was a factory part on 88-98 trucks. This one requires 88-98 spindles and will not work with the earlier spindles. All of this is explained with much greater detail in this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=367260 Ray Last edited by raycow; 08-21-2010 at 01:06 AM.

08-21-2010, 11:37 AM	#3
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: 6 lug front disc If you currently have drum brakes, you must swap spindles to install disc brakes; there's no other way to do it. I have 6-lug disc brakes on my truck and considered changing to 5-lug but didn't want to have to change the rear. Once you have the correct spindles (either stock or drop) the only difference is the rotor; one will have a 5-lug setup and the other a 6-lug, the rest of the parts will work with either setup. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

08-21-2010, 01:56 PM	#5
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: 6 lug front disc That is true, and CPP offers a modified bracket, but IMO, there's not better (or safer) way. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

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