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08-17-2023, 11:15 AM
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#1 |
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Registered User
Join Date: Sep 2018
Location: Scroggins, TX
Posts: 25
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70 GMC Disc Conversion / Rally
All,
I apologize in advance for this question. I have read all threads that I can find on this subject and I want to make sure I get it right - this is a $1,400 project. I have a 1970 GMC (6lug) step side that I will be converting to 6 lug disc brakes (no drop). My truck currently has steelies with dog dishes - looking to convert to period correct Rallys and new tires. #1 - I am looking at 6 lug 15x8 with 3 5/8" backspace rally wheels for sale locally. Will these clear the front disc when converted? Other options, or is this the correct wheel to purchase? #2 - I am looking at 255/70 BF Goodrich Radial T/A's - with this wheel/tire combination clear as needed and not hang outside the fenders? Pics of my truck if that will help with my questions. Any thoughts would be appreciated. Thanks in advance Dan |
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08-17-2023, 11:59 AM
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#2 |
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Registered User
Join Date: Mar 2014
Location: Pekin, Illinois
Posts: 442
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Re: 70 GMC Disc Conversion / Rally
I have the 6 lug ralley wheels and I did the disc brake conversion with no worries. I have Cooper Evolution HT 265/70R15 tires on my rims and they work just fine. I did lower my truck so they are close in the front yet still under the truck. I bought a disc brake converstion kit and a power brake master cylinder and vacuum booster setup from CPP. Thats a sweet truck you have.
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Harley 1969 Chevy C-10 Long Bed, 350cid, 700R4 |
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08-17-2023, 02:42 PM
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#3 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,216
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Re: 70 GMC Disc Conversion / Rally
Have 8" 6-lug ralleys on my 70 with 255/70 tires. NO issues. Stock height
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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08-17-2023, 02:55 PM
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#4 |
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Senior Member
Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,862
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Re: 70 GMC Disc Conversion / Rally
rallys will fit easy. i had 255-70-15 on 8 inch rallys with a disc brake concersion aswell
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1967custom |
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08-17-2023, 03:10 PM
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#5 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,676
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Re: 70 GMC Disc Conversion / Rally
Your questions have been answered, but I'll add that your truck is a nice looking rig!
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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08-17-2023, 04:26 PM
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#6 | |
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Registered User
Join Date: Jul 2021
Location: Keller, Texas
Posts: 542
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Re: 70 GMC Disc Conversion / Rally
Quote:
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08-17-2023, 07:01 PM
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#7 |
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Registered User
Join Date: Sep 2018
Location: Scroggins, TX
Posts: 25
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Re: 70 GMC Disc Conversion / Rally
Thank you all. Purchase made. Can't wait to install.
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08-18-2023, 08:01 AM
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#8 |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,770
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Re: 70 GMC Disc Conversion / Rally
Great looking truck!
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08-18-2023, 11:18 AM
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#9 |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,761
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Re: 70 GMC Disc Conversion / Rally
 16923716312568619998670200934305 by [url=https://www.flickr.com/photos/97391199@N06You may not be able use the center caps you desire, as these wheels have 3 nubs on the inside, so you have to run derby caps
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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