What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

G-NUT · 06-29-2016, 04:44 PM

I have a 1985 fullsize GMC 2500 that I'm converting to 1500 / C10 rolling attire.

What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember without having to narrow the rear axle?

I'm looking to run 24" wheels all around; a 24x8.5 on the front and a 24x10 in the rear.

I already have the complete Porterbuilt Level 3 front dropmember and McGaughy 2.5" lowering spindles. The complete Porterbuild Level 3 rear dropmember is on order. None of which is installed yet.

When the time comes to actually order the wheels I do plan to get the truck up in the air and do some measuring. I just thought I'd get some idea for now.

bbbc10 · 06-29-2016, 05:19 PM

5.25" bs will work...I had 10" wide rallys on mine with 5" bs an barely cleared

G-NUT · 06-29-2016, 05:50 PM

Thanks for the quick reply. Helps me get some kinda idea

G-NUT · 07-07-2016, 01:04 PM

bump

BShort · 07-07-2016, 02:16 PM

doesn't matter what suspension you are running in the rear if you are still using the stock axle. width of the rim that will fits stays the same. I have 20x10 with 295/40 on the back of my '79 with a 5.5" backspace with no rubbing, but it is CLOSE.

SCOTI · 07-07-2016, 05:27 PM

With the rear DM pending, you'll prob want 5-5.5"bs since the floor between the tubs is going to be cut anyway. The more BS used helps decrease possible issues w/the outer bedside structure when air'd out.

06-29-2016, 04:44 PM	#1
G-NUT Registered User Join Date: Apr 2014 Location: Baldwin County, Alabama Posts: 163	What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember I have a 1985 fullsize GMC 2500 that I'm converting to 1500 / C10 rolling attire. What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember without having to narrow the rear axle? I'm looking to run 24" wheels all around; a 24x8.5 on the front and a 24x10 in the rear. I already have the complete Porterbuilt Level 3 front dropmember and McGaughy 2.5" lowering spindles. The complete Porterbuild Level 3 rear dropmember is on order. None of which is installed yet. When the time comes to actually order the wheels I do plan to get the truck up in the air and do some measuring. I just thought I'd get some idea for now. __________________ '84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed

06-29-2016, 05:19 PM	#2
bbbc10 Diggin The SquareLife Join Date: Dec 2010 Location: garland,tx Posts: 1,933	Re: What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember 5.25" bs will work...I had 10" wide rallys on mine with 5" bs an barely cleared

06-29-2016, 05:50 PM	#3
G-NUT Registered User Join Date: Apr 2014 Location: Baldwin County, Alabama Posts: 163	Re: What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember Thanks for the quick reply. Helps me get some kinda idea __________________ '84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed

07-07-2016, 01:04 PM	#4
G-NUT Registered User Join Date: Apr 2014 Location: Baldwin County, Alabama Posts: 163	Re: What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember bump __________________ '84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed

07-07-2016, 02:16 PM	#5
BShort Registered User Join Date: Oct 2011 Location: Roanoke, VA Posts: 104	Re: What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember doesn't matter what suspension you are running in the rear if you are still using the stock axle. width of the rim that will fits stays the same. I have 20x10 with 295/40 on the back of my '79 with a 5.5" backspace with no rubbing, but it is CLOSE. Attached Images

07-07-2016, 05:27 PM	#6
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: What backspacing works with a 10 inch wide rear wheel and Porterbuilt dropmember With the rear DM pending, you'll prob want 5-5.5"bs since the floor between the tubs is going to be cut anyway. The more BS used helps decrease possible issues w/the outer bedside structure when air'd out. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

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