backspacing ???'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RRed67 · 10-03-2003, 10:42 AM

how much backspacing can I go before hitting the frame????

SCOTI · 10-03-2003, 10:58 AM

I had a 15x14 custom steelies w/31x18.5 MT's under my 67short fleet. The only frame mod was removal of the factory bumpstop & bracket on the outside of the frame. It might actually clear; the main reason I removed it was for clearance when it was lowered.

RRed67 · 10-03-2003, 12:18 PM

have any pics??????

gr8scott51 · 10-03-2003, 12:23 PM

There have been lots of threads on this, try running a search on backspace. Stock is 4-1/2".

SCOTI · 10-03-2003, 03:57 PM

The only pics I have are from years ago & My scanner doesn't want to scan them for some reason. It looked like a typical pro-street truck, the main difference was I used offset wheels instead of narrowing the rear-end. I didn't want to narrow the rear because I knew eventually I would step up to big diameter wheels.... which I did.

RRed67 · 10-06-2003, 01:43 PM

SCOTI how much offset did you use???????

Frank_Zeller · 10-06-2003, 04:07 PM

Pretty sure the stock 15 inch steel rims are 3.5 offset. I've run 15 inch 4.5 offset rims with no problems.

SCOTI · 10-06-2003, 08:06 PM

15x14 w/10" b.spacing.

butter · 10-06-2003, 10:01 PM

SCOTI
If I make the frame mod and put some bigger tubs in the bed of my fleet side I should be able to run a 31x18 tire with out rubbing the frame. I do not have to move the trailing arms are anything else is that right.

SCOTI · 10-06-2003, 11:59 PM

The trailing arms remain stock.... you just can't use lowering blocks w/this set-up. I widened my tubs to the frame rail. I also had to tweak the e-brake cables so they wouldn't contact the wheels but that was pretty easy.

10-03-2003, 10:42 AM	#1
RRed67 Registered User Join Date: Jul 2003 Location: dallas Posts: 27	backspacing ???'s how much backspacing can I go before hitting the frame????

10-03-2003, 10:58 AM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,031	I had a 15x14 custom steelies w/31x18.5 MT's under my 67short fleet. The only frame mod was removal of the factory bumpstop & bracket on the outside of the frame. It might actually clear; the main reason I removed it was for clearance when it was lowered. __________________ 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.*

10-03-2003, 12:23 PM	#4
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	lots of threads There have been lots of threads on this, try running a search on backspace. Stock is 4-1/2". __________________ Silence is golden, duct tape is silver. - Scott

10-03-2003, 03:57 PM	#5
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,031	The only pics I have are from years ago & My scanner doesn't want to scan them for some reason. It looked like a typical pro-street truck, the main difference was I used offset wheels instead of narrowing the rear-end. I didn't want to narrow the rear because I knew eventually I would step up to big diameter wheels.... which I did. __________________ 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.*

10-06-2003, 04:07 PM	#7
Frank_Zeller Registered User Join Date: Jun 2001 Location: Austin, Texas Posts: 796	Pretty sure the stock 15 inch steel rims are 3.5 offset. I've run 15 inch 4.5 offset rims with no problems. __________________ 69 SWB C/10 5-6 drop 700R4 69 Firebird Convert 455 4 spd 70 Torino GT Convert Austin-Texas

10-03-2003, 12:18 PM	#3
RRed67 Registered User Join Date: Jul 2003 Location: dallas Posts: 27	have any pics??????

10-06-2003, 01:43 PM	#6
RRed67 Registered User Join Date: Jul 2003 Location: dallas Posts: 27	SCOTI how much offset did you use???????

10-06-2003, 08:06 PM	#8
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,031	15x14 w/10" b.spacing. __________________ 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.*

10-06-2003, 10:01 PM	#9
butter Registered User Join Date: Jan 2000 Location: Orange Beach, Alabama Posts: 133	SCOTI If I make the frame mod and put some bigger tubs in the bed of my fleet side I should be able to run a 31x18 tire with out rubbing the frame. I do not have to move the trailing arms are anything else is that right. __________________ 71 cheyenne 402 th400 swb 71 camper special (PARTS TRUCK) 70 Stepside swb 350

10-06-2003, 11:59 PM	#10
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,031	The trailing arms remain stock.... you just can't use lowering blocks w/this set-up. I widened my tubs to the frame rail. I also had to tweak the e-brake cables so they wouldn't contact the wheels but that was pretty easy. __________________ 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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