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#1 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Were GMC leaf springs an option?
I have heard that GMC had leafsprings standard and you could option for coil overs. Chevy was the other way. I have a 69 GMC and the spid says under the options G70 for leaf springs. Can someone more learned than me explain this?
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#2 |
Registered User
Join Date: Sep 2003
Location: Rohnert Park, California
Posts: 31
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Re: Were GMC leaf springs an option?
From 1963-68 GMC did not offer rear coil spring suspension, they actually didn't like the way it worked because suspension travel was limited. By 1969 rear coils were available again but this was due to some GMC trucks and all suburbans were being produced by Chevrolet.
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#3 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
So if Chevy built the truck they may have been thinking option for leaf springs instead of standard. That may explain the option code on the SPID.
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#4 | |
Registered User
Join Date: Sep 2003
Location: Rohnert Park, California
Posts: 31
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Re: Were GMC leaf springs an option?
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#5 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Were GMC leaf springs an option?
G70 was a suspension package.2000 lb (each) leafs,12x2 1/2 brakes,HD shocks, 4.56 Dana rear (with certain engine/trans combos).
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#6 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
Another ? then. Why would that option be on a shortbed stepside. Seems like that would be a 3/4 ton option. The spid and the cab have the same vin. on them. I am going to go look at the frame and see if it matches the vin.
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#7 |
Senior Member
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Location: Saskatoon,SK,Canada
Posts: 2,476
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Re: Were GMC leaf springs an option?
In Canada all 67-72 Chev and GMC were typically coil but could be optioned either way.
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Saskatoon, Saskatchewan Canada |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Were GMC leaf springs an option?
69 was an odd year, coils were standard on 1/2 ton GMCs. I have a paper somewhere that I have posted a few times on here that shows this as fact.
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#9 |
Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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Re: Were GMC leaf springs an option?
After reading many posts and threads on this subject, I am convinced that
all the '67 - '72 2wd half ton trucks (GMC and Chevy) came with coil springs standard. Leaf springs were an option as your SPID shows.
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Tim |
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#10 | |
Registered User
Join Date: Sep 2003
Location: Rohnert Park, California
Posts: 31
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Re: Were GMC leaf springs an option?
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#11 | |
Registered User
Join Date: Sep 2003
Location: Rohnert Park, California
Posts: 31
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Re: Were GMC leaf springs an option?
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#12 |
Senior Member
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Location: Williston, ND
Posts: 2,999
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Re: Were GMC leaf springs an option?
GMCs were ALMOST all leaf springs, however it was still an option. The coil was standard, just not par for gmc trucks.
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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#13 |
Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: Were GMC leaf springs an option?
It was prolly a heavy duty package for the half ton vs the three quarter ton
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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#14 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Were GMC leaf springs an option?
Don't know why it was on a C10 but here's the C20 info in case nobody believes anything I say;
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#15 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
Engine is long gone but it was a 6cyl because of the vin. and 3.73 rear end, but according to that document it should have had a 4.56 rear. Its says 250,292,307 and 350 engines would have 4.56 gears. If I read it correctly
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#16 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
Also it has the 11" brakes. I suppose someone could have switched the rear axle. Does the axle have the vin like the frame,cab and SPID?
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#17 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Were GMC leaf springs an option?
So does the frame VIN match the cab's?-or did I miss that post?
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#18 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Were GMC leaf springs an option?
your GMC is a 1/2 ton. 3.73 is the base gear ratio for all 3 speed manual shift 1/2 ton trucks if memory serves... 4.56 is the base gear ratio for all 3 speed manual shift trucks in 3/4 ton.
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#19 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
C S 1 0C-1 A is the vin. 2wd 6cyl 1/2 ton fenderside. The GMCpauls gmc data dosen't list 1 for a plant but the Chevy data says 1 is Oshawa. where ever Oshawa is.
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#20 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: Were GMC leaf springs an option?
Also the vin matches on the frame, cab and Spid.
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#21 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Were GMC leaf springs an option?
GMC decodes differantly than chevy, look here; (69 only, other years differ)
Last edited by Longhorn Man; 05-08-2008 at 04:29 AM. |
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#22 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Were GMC leaf springs an option?
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#23 |
Registered User
Join Date: May 2007
Location: Cleveland Tx
Posts: 5
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Re: Were GMC leaf springs an option?
I've always heard that GMC all had leafs, and chevy had coils. But chevy also had leafs on the heave half tons , and leafs on larger trucks. I've never seen a GMC with coils. I've had alot of these trucks and still do, but I do have a Chevy 1/2 ton with leafs.
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72 chevy swb wide project 67 swb stepside project 2007 Dodge ram 4x4 2004 Camry |
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#24 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Were GMC leaf springs an option?
I have had 2 GMC trucks that came with coils - a '69 and a '72. It does not list coils on the SPID, but every GMC with leafs I have, a '69, '70, and a '71 all have Leaf Springs listed on the SPID as an option... I also have a '67 3/4 ton, but it doesn't have a SPID, and looks like it never did. (original paint on the glove box door, no glue residue or scratching?)
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#25 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Were GMC leaf springs an option?
there is no such thing as a heavy half untill the late 70's and by then they were all leaf.
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