Width of 71-72 rear end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BADPURPLE70CHEVY · 03-01-2013, 11:11 PM

Anyone remember the width of a 70 rear end versus the wider 71-72 rear end? I can't remember to save my life.

**lolife99** · 03-02-2013, 12:06 AM

They could be the same width.
The two I have are.
Some of the early '70 housings are the narrow 67-69 width.
I use a backing plate - to - backing plate width.
55-1/2" for the early rearend.
57" for the later rearend.
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CC69Rat · 03-02-2013, 08:26 AM

My 70 GMC has the wider rear end. GMC thing maybe?
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**lolife99** · 03-02-2013, 10:09 AM

Quote:

Originally Posted by CC69Rat

My 70 GMC has the wider rear end. GMC thing maybe?

One of mine was a GMC leaf spring truck.
The other was a Chevy coil spring truck.
Who knows.

68Stepbed · 03-02-2013, 02:55 PM

In late 1970, Chevy knew they were going to change over to dsic brakes as standard equipment, so a few 70 models came equipped with disc brakes. Others were just equipped with wider axle housings. I'm assuming this was because they had already started producing them for the 71 model year pickups.

There's always oddities in "change-over" vehicles like that.

Chvy2NV · 03-02-2013, 04:49 PM

Subd
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**lolife99** · 03-02-2013, 05:58 PM

I've never seen a documented disc brake 1970 truck anywhere.
Any Internet info out there that supports this?
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68Stepbed · 03-04-2013, 09:41 AM

They're very rare. Most of the time, one would think it's been converted. There's a local lot in town that always has some classic vehicles. I usually don't stop becasue he's VERY high on his prices. I stopped in once, though to check out a nice, light blue 70 on the lot. I don't remember the exact package, but it was pretty loaded with discs, and 5-lug. It seemed to be in great unrestored original condition, so I asked if it had been converted to disc brakes. He said no, it was all original. I first thought he either didn't know what he had and was selling, but I looked at the SPID, and sure enough, it had disc brakes as an option. This is the only one I've ever seen, that I know for a fact had it from the factory.

03-01-2013, 11:11 PM	#1
BADPURPLE70CHEVY 406 Powered Join Date: Aug 2009 Location: waynesville,n.c. Posts: 877	Width of 71-72 rear end Anyone remember the width of a 70 rear end versus the wider 71-72 rear end? I can't remember to save my life. __________________ 70 GMC 68 c10 2002 silverado 72 4x4

03-02-2013, 12:06 AM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,696	Re: Width of 71-72 rear end They could be the same width. The two I have are. Some of the early '70 housings are the narrow 67-69 width. I use a backing plate - to - backing plate width. 55-1/2" for the early rearend. 57" for the later rearend. Posted via Mobile Device __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-02-2013, 08:26 AM	#3
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,208	Re: Width of 71-72 rear end My 70 GMC has the wider rear end. GMC thing maybe? Posted via Mobile Device __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

03-02-2013, 02:55 PM	#5
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Width of 71-72 rear end In late 1970, Chevy knew they were going to change over to dsic brakes as standard equipment, so a few 70 models came equipped with disc brakes. Others were just equipped with wider axle housings. I'm assuming this was because they had already started producing them for the 71 model year pickups. There's always oddities in "change-over" vehicles like that. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

03-02-2013, 04:49 PM	#6
Chvy2NV Registered User Join Date: Apr 2012 Location: So. Florida Posts: 873	Re: Width of 71-72 rear end Subd Posted via Mobile Device

03-02-2013, 05:58 PM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,696	Re: Width of 71-72 rear end I've never seen a documented disc brake 1970 truck anywhere. Any Internet info out there that supports this? Posted via Mobile Device __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-04-2013, 09:41 AM	#8
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Width of 71-72 rear end They're very rare. Most of the time, one would think it's been converted. There's a local lot in town that always has some classic vehicles. I usually don't stop becasue he's VERY high on his prices. I stopped in once, though to check out a nice, light blue 70 on the lot. I don't remember the exact package, but it was pretty loaded with discs, and 5-lug. It seemed to be in great unrestored original condition, so I asked if it had been converted to disc brakes. He said no, it was all original. I first thought he either didn't know what he had and was selling, but I looked at the SPID, and sure enough, it had disc brakes as an option. This is the only one I've ever seen, that I know for a fact had it from the factory. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system



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