Disc Brake Conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**425HP409** · 11-01-2013, 03:20 PM

I have a customer's 68 truck that his Dad bought new and I am in the process of making it mechanically sound and safer. It is a real nice Custom SWB truck with Factory AC, PS and an original 307/Powerglide. . The owner is real particular as to not make any real changes from when his Dad had the truck. I finally convinced him to allow me to do a Disc Brake upgrade, but I think I may have a problem doing it as the truck has the original wheels that I don't think will work with the Discs. Does anyone know if Discs will work with the 68 wheels, or will I have to change them out. I need to keep the truck 6 lug, so if I have to change them, will 71-72 blazer wheels work?
Thanks, Charles

**bigmac73** · 11-01-2013, 03:25 PM

i had a 69 in high school and went to a 8 in front / 10in rear wide wheel , i think they came off a toyota or new chevy at the time, i am sure that gives you more backspacing

Rochlow · 11-01-2013, 03:26 PM

There are companies that sell 6 lug disc brakes. However, you will need to change the wheels from pre-72 six lug wheels to 72-87 six lug wheels. The earlier wheels hit the caliper and wont allow the wheel to turn

You can tell what you have as the pre-72 have three nubs for the hub caps and the newer ones have four.

**425HP409** · 11-01-2013, 05:12 PM

Quote:

Originally Posted by Rochlow

There are companies that sell 6 lug disc brakes. However, you will need to change the wheels from pre-72 six lug wheels to 72-87 six lug wheels. The earlier wheels hit the caliper and wont allow the wheel to turn

You can tell what you have as the pre-72 have three nubs for the hub caps and the newer ones have four.

Thanks, I will have to have the nubs for the hub caps to go back on. I didn't think the original wheels would work, but if I can get the later wheels and paint them, the truck would still look original and keep the owner happy.

67Run · 11-01-2013, 06:43 PM

got mine off of ebay. fit perfectly. was for 6 lug! was around $900 shipped for the front kit.

Longhorn 70 · 11-01-2013, 09:36 PM

Charles,

You could do wheel spacers in front too but that would push the front out. I think you only need 1 inch. If you do the wheels, make sure to get 5 of them so he doesn't have to jockey things around if he needs to use the spare.

5150.4.67 · 11-02-2013, 12:58 AM

Do you really need discs? If it's just going to be a grocery getter, leave it on drums? It's such a nice unmolested specimen.......

**425HP409** · 11-04-2013, 05:41 PM

Quote:

Originally Posted by 5150.4.67

Do you really need discs? If it's just going to be a grocery getter, leave it on drums? It's such a nice unmolested specimen.......

The owner will be driving it some to his business in Dallas Traffic

11-01-2013, 03:20 PM	#1
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Disc Brake Conversion I have a customer's 68 truck that his Dad bought new and I am in the process of making it mechanically sound and safer. It is a real nice Custom SWB truck with Factory AC, PS and an original 307/Powerglide. . The owner is real particular as to not make any real changes from when his Dad had the truck. I finally convinced him to allow me to do a Disc Brake upgrade, but I think I may have a problem doing it as the truck has the original wheels that I don't think will work with the Discs. Does anyone know if Discs will work with the 68 wheels, or will I have to change them out. I need to keep the truck 6 lug, so if I have to change them, will 71-72 blazer wheels work? Thanks, Charles Attached Images __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette

11-01-2013, 03:25 PM	#2
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Disc Brake Conversion i had a 69 in high school and went to a 8 in front / 10in rear wide wheel , i think they came off a toyota or new chevy at the time, i am sure that gives you more backspacing __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

11-01-2013, 03:26 PM	#3
Rochlow Registered User Join Date: Aug 2006 Location: St. Albans, Vt Posts: 2,520	Re: Disc Brake Conversion There are companies that sell 6 lug disc brakes. However, you will need to change the wheels from pre-72 six lug wheels to 72-87 six lug wheels. The earlier wheels hit the caliper and wont allow the wheel to turn You can tell what you have as the pre-72 have three nubs for the hub caps and the newer ones have four. __________________ ///Relaxed Atmosphere

11-01-2013, 06:43 PM	#5
67Run Registered User Join Date: Apr 2012 Location: phoenix Posts: 32	Re: Disc Brake Conversion got mine off of ebay. fit perfectly. was for 6 lug! was around $900 shipped for the front kit.

11-01-2013, 09:36 PM	#6
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: Disc Brake Conversion Charles, You could do wheel spacers in front too but that would push the front out. I think you only need 1 inch. If you do the wheels, make sure to get 5 of them so he doesn't have to jockey things around if he needs to use the spare. __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9

11-02-2013, 12:58 AM	#7
5150.4.67 Registered User Join Date: Dec 2007 Location: Modesto, Ca Posts: 411	Re: Disc Brake Conversion Do you really need discs? If it's just going to be a grocery getter, leave it on drums? It's such a nice unmolested specimen.......



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