Dumb DEEP backspacing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

laplander · 09-11-2011, 11:29 PM

The truck is a 1967 with the 62" wide rear end with a short stepside bed on top with a 3.5/6 drop from ECE. Here's where the prolem lies. I've got a set of 17x8 American Racing AR 200s with 4" backspaing, that I would like to use on the kid's pro street truck. The problem that I am running into is I want to run a 29x18.5x17 tire in the back, but the most I can go as far as backspacing is going to be another 4.75 for a total of 12.75 inches of rim. At least that's what I'm figuring. Is that going to be enough, or do I need to come up with some other plan. To all you guys running deep backspacing to get the big tires out back, what were your measurments. Any help is appreciated, this is the last stop on the parts checklist. Is the 4" backspacing going to be ok on front with a 245/45/17? Or maybe a 245/55/17?
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1968SWBBigBlock · 09-12-2011, 10:29 PM

4" back spacing up front might be too deep - you will have to look for clearnce of the a arms in the down position and fully turned at the wheels locks
You should run at least a 13" wide wheel in the back.
8.75" back space is the max I can run on mine with a stock width rear end

09-11-2011, 11:29 PM	#1
laplander Registered User Join Date: Nov 2002 Location: NM Posts: 705	Dumb DEEP backspacing question The truck is a 1967 with the 62" wide rear end with a short stepside bed on top with a 3.5/6 drop from ECE. Here's where the prolem lies. I've got a set of 17x8 American Racing AR 200s with 4" backspaing, that I would like to use on the kid's pro street truck. The problem that I am running into is I want to run a 29x18.5x17 tire in the back, but the most I can go as far as backspacing is going to be another 4.75 for a total of 12.75 inches of rim. At least that's what I'm figuring. Is that going to be enough, or do I need to come up with some other plan. To all you guys running deep backspacing to get the big tires out back, what were your measurments. Any help is appreciated, this is the last stop on the parts checklist. Is the 4" backspacing going to be ok on front with a 245/45/17? Or maybe a 245/55/17? __________________

09-12-2011, 10:29 PM	#2
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Dumb DEEP backspacing question 4" back spacing up front might be too deep - you will have to look for clearnce of the a arms in the down position and fully turned at the wheels locks You should run at least a 13" wide wheel in the back. 8.75" back space is the max I can run on mine with a stock width rear end __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree



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