Leaf springs - what is stock? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bowtie001 · 03-15-2013, 01:10 PM

My truck, 72 GMC long bed half ton, is undergoing restoration. As part of that, I have some plans for the rear suspension. I wanted to look at the original spring rates, but I am finding that none of the springs which are listed for this truck match what's under there. Currently it's 3 leaf plus an overload. Is this a stock pack? It looks it. Can anyone talk about what stock packs were available and what I have on here?

Thanks

SS Tim · 03-15-2013, 01:37 PM

What is listed on the SPID and what is the rear axle rating on the data plate?

Bowtie001 · 03-15-2013, 10:06 PM

The original rear axle is gone. The tag says "G70 R suspension leaf spring".

SS Tim · 03-15-2013, 11:25 PM

Look my GMC references are limited on this. So I am trying to work it backward from the chevy side. They should be 1250-lb each, two-stage springs. BTW: If you need it, here are bruceman1968's decoders.
http://67-72chevytrucks.com/vboard/s...d.php?t=570059

So far it looks like a four leaf would be the stock C10/C1500 application. If you are wanting heavier springs the standard C20/C2500 five leaf would be the step up on a half ton truck.

Bowtie001 · 03-16-2013, 01:23 PM

Thanks Tim!

03-15-2013, 01:10 PM	#1
Bowtie001 Project underway - finally. Join Date: Feb 2007 Location: Greenville, SC Posts: 493	Leaf springs - what is stock? My truck, 72 GMC long bed half ton, is undergoing restoration. As part of that, I have some plans for the rear suspension. I wanted to look at the original spring rates, but I am finding that none of the springs which are listed for this truck match what's under there. Currently it's 3 leaf plus an overload. Is this a stock pack? It looks it. Can anyone talk about what stock packs were available and what I have on here? Thanks __________________ 1972 GMC Pre-resto... awaiting allocated funding.

03-15-2013, 01:37 PM	#2
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Leaf springs - what is stock? What is listed on the SPID and what is the rear axle rating on the data plate? __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-15-2013, 10:06 PM	#3
Bowtie001 Project underway - finally. Join Date: Feb 2007 Location: Greenville, SC Posts: 493	Re: Leaf springs - what is stock? The original rear axle is gone. The tag says "G70 R suspension leaf spring". __________________ 1972 GMC Pre-resto... awaiting allocated funding.

03-15-2013, 11:25 PM	#4
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Leaf springs - what is stock? Look my GMC references are limited on this. So I am trying to work it backward from the chevy side. They should be 1250-lb each, two-stage springs. BTW: If you need it, here are bruceman1968's decoders. http://67-72chevytrucks.com/vboard/s...d.php?t=570059 So far it looks like a four leaf would be the stock C10/C1500 application. If you are wanting heavier springs the standard C20/C2500 five leaf would be the step up on a half ton truck. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-16-2013, 01:23 PM	#5
Bowtie001 Project underway - finally. Join Date: Feb 2007 Location: Greenville, SC Posts: 493	Re: Leaf springs - what is stock? Thanks Tim! __________________ 1972 GMC Pre-resto... awaiting allocated funding.



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