72 chevy swb rearend measurement?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rex01atv · 05-20-2011, 12:05 PM

I'm trying to figure out how much to narrow my rearend, so i measured from backing plate to backing plate and came up with 59''??? Does this sound correct to anybody??? I want to run a 20x10 with 4'' backspacing with a 295/40/20. I already mini tubbed the wheel wells. I'm thinking i need to narrow rearend 1.50 on each side??? I have 18x9 with 4.50 backspacing and when i air the bags out it tucks perfectly! Can anybody help.

**lolife99** · 05-22-2011, 05:10 PM

59" sounds wide.
I would shove your new 20x10's under the bedsides and measure between the wheel mounting surfaces.
That the most accurate way to get a "total" width that the narrowed rearend needs to be.
Too much money to just guess.

rex01atv · 05-22-2011, 07:53 PM

That would require me to remove the rearend to get the wheels where i want correct??

**lolife99** · 05-22-2011, 08:11 PM

Correct.
I thought you said it was going to be narrowed?

**lolife99** · 05-22-2011, 08:15 PM

If you have the early 67-69 housing,... a 20x10 with 5" BS should tuck.
I'm not sure it's worth the price of narrowing the rearend housing and axles for just 1" per side.
(unless you already have the wheels).
I have the wide rearend, (71-72) in my blazer.
I'm running a 20x9.5 with 5.5" BS to clear the bedsides when air'd out.
(bolt in c-notch and bags only)

Will your truck lay out?
Or do you just have bags in place of the stock springs?

rex01atv · 05-22-2011, 08:26 PM

yea, it will lay out, I have bridgenotch, tubular traling arms from cpp and relocated bags to inside of freame rails. I'm currently running 18x9 with 4.50 backspace and they tuck up inside the wheel wells pretty tight once all the air is out.

**lolife99** · 05-22-2011, 08:32 PM

Then a 10" rim with a 5.5" BS should work.
(or your 10" with a 4" BS and 1.5"/side narrowed rearend like you originally posted)

Sounds like you have it figured out.

rex01atv · 05-22-2011, 08:56 PM

okay, thanks for your help, by the way what size wheels and tires are on your silver blazer??? I was thinking about running torque thrust 2 wheels??

**lolife99** · 05-22-2011, 08:58 PM

20x8 (5.25" bs) and 20x9.5 (5.5" bs).
245/40's and 295/40's.

greens69 · 05-25-2011, 11:35 PM

In my 72 Blazer I am running a 22 x 10 with a 4" backspace, I narrowed the factory rearend 2" each side with no rubbing issues...it also has air ride

rex01atv · 05-26-2011, 07:26 AM

looks good! any mor pics??

05-20-2011, 12:05 PM	#1
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	72 chevy swb rearend measurement?? I'm trying to figure out how much to narrow my rearend, so i measured from backing plate to backing plate and came up with 59''??? Does this sound correct to anybody??? I want to run a 20x10 with 4'' backspacing with a 295/40/20. I already mini tubbed the wheel wells. I'm thinking i need to narrow rearend 1.50 on each side??? I have 18x9 with 4.50 backspacing and when i air the bags out it tucks perfectly! Can anybody help.

05-22-2011, 05:10 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: 72 chevy swb rearend measurement?? 59" sounds wide. I would shove your new 20x10's under the bedsides and measure between the wheel mounting surfaces. That the most accurate way to get a "total" width that the narrowed rearend needs to be. Too much money to just guess. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 05-22-2011 at 05:10 PM.

05-22-2011, 07:53 PM	#3
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	Re: 72 chevy swb rearend measurement?? That would require me to remove the rearend to get the wheels where i want correct??

05-22-2011, 08:11 PM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: 72 chevy swb rearend measurement?? Correct. I thought you said it was going to be narrowed? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

05-22-2011, 08:15 PM	#5
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: 72 chevy swb rearend measurement?? If you have the early 67-69 housing,... a 20x10 with 5" BS should tuck. I'm not sure it's worth the price of narrowing the rearend housing and axles for just 1" per side. (unless you already have the wheels). I have the wide rearend, (71-72) in my blazer. I'm running a 20x9.5 with 5.5" BS to clear the bedsides when air'd out. (bolt in c-notch and bags only) Will your truck lay out? Or do you just have bags in place of the stock springs? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 05-22-2011 at 08:16 PM.

05-22-2011, 08:26 PM	#6
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	Re: 72 chevy swb rearend measurement?? yea, it will lay out, I have bridgenotch, tubular traling arms from cpp and relocated bags to inside of freame rails. I'm currently running 18x9 with 4.50 backspace and they tuck up inside the wheel wells pretty tight once all the air is out.

05-22-2011, 08:32 PM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: 72 chevy swb rearend measurement?? Then a 10" rim with a 5.5" BS should work. (or your 10" with a 4" BS and 1.5"/side narrowed rearend like you originally posted) Sounds like you have it figured out. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

05-22-2011, 08:56 PM	#8
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	Re: 72 chevy swb rearend measurement?? okay, thanks for your help, by the way what size wheels and tires are on your silver blazer??? I was thinking about running torque thrust 2 wheels??

05-22-2011, 08:58 PM	#9
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,685	Re: 72 chevy swb rearend measurement?? 20x8 (5.25" bs) and 20x9.5 (5.5" bs). 245/40's and 295/40's. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

05-25-2011, 11:35 PM	#10
greens69 Registered User Join Date: Oct 2000 Location: Tomball,Texas USA Posts: 324	Re: 72 chevy swb rearend measurement?? In my 72 Blazer I am running a 22 x 10 with a 4" backspace, I narrowed the factory rearend 2" each side with no rubbing issues...it also has air ride __________________ Houston and Dallas Autorama Show Chairman ///Relaxed Atmosphere 1969 Chevrolet C10 1972 Chevrolet 2WD Blazer 1987 GMC Sierra

05-26-2011, 07:26 AM	#11
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	Re: 72 chevy swb rearend measurement?? looks good! any mor pics??



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