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#1 |
Registered User
Join Date: Apr 2010
Location: McFarland CA
Posts: 1,392
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Backspacing in 71-72
Hi I want to make a change in my truck. I did the swap of 6 lug to 5 and I need to know the backspacing on some new wheels. I want to put 8" in front and 10" on back. Please any input would be appreciated. Thanks.
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#2 |
New Member
Join Date: Sep 2006
Location: texas
Posts: 118
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Re: Backspacing in 71-72
Did you do the just the axle conversion or didyou put a 71 or 72 rearend.Iknow someone here can help.
Last edited by stefan; 01-08-2011 at 02:24 AM. |
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#3 |
67-72 parts collector,…
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Re: Backspacing in 71-72
Stock height?
Static dropped? Air ride? What's your suspension plans?
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#4 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
Posts: 24,461
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Re: Backspacing in 71-72
What size wheels?
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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#5 |
Registered User
Join Date: Jul 2000
Location: Victoria,BC, Canada
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Re: Backspacing in 71-72
Does it have air conditioning?
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71 GMC 1500 LWB |
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#6 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
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Re: Backspacing in 71-72
Confused... Won't really affect the backspacing on a wheel.
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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#7 |
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Location: Victoria,BC, Canada
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Re: Backspacing in 71-72
Sorry...after all the questions as to the particulars I couldn't help but mimic the obviously non-pertinent questions you get when you try to order a part at an auto supply store.
Me: I would like an oil filter Parts person: what colour is your truck?
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71 GMC 1500 LWB |
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#8 |
67-72 parts collector,…
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Re: Backspacing in 71-72
Spoof,... I understand your sarcasism.
But sometimes it's like "pulling teeth" to get all info out of the OP. I only ask questions when I don't have enough info to give a good answer. The wheel diameter is very important when it comes to backspacing numbers. So is the amount of drop.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#9 |
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Join Date: Jul 2000
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Re: Backspacing in 71-72
I'm sorry guys, I came across as making fun of you. I was trying to be funny but I wasn't inferring that any of the questions asked by members were irrelevant, in fact they were very pertinent and necessary to answer the bs question.
No dig or passive aggressiveness was intended, only a poke at parts store clerks! Sorry to derail the post. If it helps...my 18"X9.5" rear are 4.5" bs and the 18"X8" fronts are 4" bs. 4" drop springs back, 2.5 spindles front.
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71 GMC 1500 LWB |
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#10 |
New Member
Join Date: Sep 2006
Location: texas
Posts: 118
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Re: Backspacing in 71-72
Hey Lolife you have always given me good advice,so lets do mine im about to buy wheels in i hope a month,my truck is a 5.5 front and 8 inch in the rear and i want 17 or 18 inch wheels 8.5 in front and 10 inch in the rear and the truck is a 72 swb,thanks bud
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#11 |
Registered User
Join Date: Apr 2010
Location: McFarland CA
Posts: 1,392
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Re: Backspacing in 71-72
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#12 |
Registered User
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Re: Backspacing in 71-72
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#13 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
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Re: Backspacing in 71-72
Dropped how? Static, bags, etc.
In order to provide assistance to your question, we need to have more background into what you're dealing with. Also... what size wheel do you want to run? There's a lot that goes into determining the correct BS to run on a set of wheels for them to fit "right."
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) Last edited by 72BlckButy; 01-09-2011 at 12:22 AM. |
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#14 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
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Re: Backspacing in 71-72
If by dropped you mean staticly... how low are you? 2/4, 3/5, 4/6?
With running a set of rallys, all you should need on a 4" drop in the front will be a creative grinding on the lower a-arm since you are running disc brakes.
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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#15 |
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Re: Backspacing in 71-72
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#16 | |
67-72 parts collector,…
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Re: Backspacing in 71-72
Quote:
But for a static drop: 8.5" wheel in the front: I would use a 5.25"-5.5" backspace. 10" wheel in the rear,... (with the wider 71-72 rearend housing). I would use a 5.5" backspace.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#17 |
Tot Roddin'
Join Date: Apr 2005
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Re: Backspacing in 71-72
Grind the a-arm.
Refer to: http://67-72chevytrucks.com/vboard/s...4&postcount=61 Please provide enough information when asking for assistance; it really helps to determine everything that is involved.
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) Last edited by 72BlckButy; 01-09-2011 at 12:45 AM. |
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#18 | |
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Re: Backspacing in 71-72
Quote:
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#19 |
67-72 parts collector,…
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Re: Backspacing in 71-72
OK,...
4/6 drop 15x8 and 15x10 ralleys. It would be nice to run greater than a 5" BS up front,... but that's not possible. 4" BS is the most with a 15" rim,... and that will require a little grinding on the lower a-arm in the balljoint area. An 8" rim up front with a 4" BS may be close to rubbing the fender lip with a 4" front drop. It all depends on tire height. I usually run a 7" rim up front when I use 15" wheels with that much drop. The rear 10" ralleys will work with a 5"-5.5" BS. Here's my '69 with a 5.5/7 drop on 15" truck ralleys. (15x7's and 15x8's)
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 01-09-2011 at 12:59 AM. |
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#20 |
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Re: Backspacing in 71-72
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#21 |
Tot Roddin'
Join Date: Apr 2005
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Re: Backspacing in 71-72
Everything that lolife99 posted above is covered in the following two threads:
Project NO-Life: http://67-72chevytrucks.com/vboard/s...hlight=no-life Project Blank Slate: http://67-72chevytrucks.com/vboard/s...d.php?t=353633
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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