Leaf or coil standard rear spring on GMC?

[68 50th]

I have learned from this board Chevy C10 and C20 came with coils in the rear as standard and leafs was an option and that it was the other way around with the GMC´s, leafs standard and coils as option.

I then saw this GMC sales broshure which claims coils as standard and leafs as option, just like the Chevys.
http://www.lov2xlr8.no/brochures/gmc...p/bilder/7.jpg
It is a Canadian sales broshure so maybe this a a Canadian only thing?

[uncle]

Every GMC I've ever had still had rear leaf suspension as an option on the spid. I don't know why but it just seems like more GMC's had leaf.

[mike16]

the way I heard it was that coils were standard on chevy c 10 and 20 and that leaf springs were optional, and exactly the opposite for GMC's

[Gmc.guy]

Here it seems like half and half. Lots of gmc's have coils. Same with chevy's I have noticed lots of the 4 speed trans trucks have leafs

[CCCC]

Have not researched this matter, but have owned quite a number of these Chevs/GMs and looked at many more. With pickup type, have come to the following impressions:
1 ton - C30/3500 - leaf rear.
3/4 ton - C20/2500 - leaf rear
1/2 ton - C10/1500 - usually coil rear but some with leaf rear (maybe called "heavy half")
I think every "K" model seen has been leaf front and rear.

Hope this helps - ready to be wrong.

[68 50th]

Thanks for replys.
There is in fact both Chevys and GMS´s C10 and C20 of both brands with coils and with leafs.
C30 and up and all K models came with leafs, both Chevy and GMC´s.

The question I had was what type was standard and what type was optional?

For the Chevys I am almost sure coils were standard and leafs was avaliable as an option. At least that is what most people on this forum says and that is also backed up with the information in the sales brochures.

For the GMC´s most people says it was the other way around, leafs standard and coils was an optional. For the GMC´s I haven´t seen any other sales brochure or other documentation than the Canadian broshure posted in this thread.

It would be interesting if anyone have a US GMC sales broshure that states one or the other.

[Bob B.]

Well...... Yes, all 30/3500's, Longhorns, and 4X4's had leafs. '67-'68 U.S. GMC 4X2 pickups were almost always leaf spring/Dana rear axle, Chevy's were usually coils with Corp. or Eaton axles. '69 and later it seems that anything was optional in everything. I have seen Dana axles with coil springs on Chevy's, ect.. Canadian GMC's are different, pre-'69 they are a lot closer to Chevy's than U.S. GMC's.

I consider my '67 a 'real' GMC. It has a V-6, New Process transmission, and a Dana 60 with leafs. That combination was not available in a Chevy in '67.

[special-K]

It's always been confusing. From what we see out there we could say Chevy = Coils standard/leaf optional and GMC = leaf standard/coil optional. BUT... if you go by the SPIDs, it's all the same. You will never see a SPID showing a "Coil Spring" option. It would seem GM made most all C10-20 GMCs with at least one option, leaf springs. Maybe it was a way to have a difference in base price for gov't order purposes. It seems they always got Chevys

I look at it like automatic transmissions. When I ordered my '92 K3500 I got every option I ever wanted. I wanted a 5spd manual transmission. While almost all trucks came through with automatic, it was still a $1,000 option. I saved that much by going with the standard transmission which is a rare exception in a loaded truck.

[71CHEVYSHORTBED402]

I've heard from a very good source that Custom Deluxe had rear leaf springs. If someone has one that came with coils instead, I'd be interested to hear about it.

[ettsn]

Originally Posted by 71CHEVYSHORTBED402

I've heard from a very good source that Custom Deluxe had rear leaf springs. If someone has one that came with coils instead, I'd be interested to hear about it.

I've got a '71 C10 Custom Deluxe with coils plus overload leafs in the rear.

[davepl]

Can't say for certain, but on our Canadian GMC 910 I remember the coils NOT being on the SPID. It had overloaders that were. But the coils seemed to be part of the base equipment on the GMC based on that.

[54blackhornet]

I have several Salesmen Order-guides from 67 on. It clearly states Coils standard , leaf optional on Chevrolet C-10

[In The Ten Ring]

I would have to agree with the guy above. My truck is about as bone basic as you can get and it came with rear coils.

[special-K]

Originally Posted by 71CHEVYSHORTBED402

I've heard from a very good source that Custom Deluxe had rear leaf springs. If someone has one that came with coils instead, I'd be interested to hear about it.

Well, I'd have to scratch that source for being a good one, because that is totally wrong. Trim level had nothing to do with it and anyone who knows anything about these trucks knows that much.

Originally Posted by 54blackhornet

I have several Salesmen Order-guides from 67 on. It clearly states Coils standard , leaf optional on Chevrolet C-10

Yes, that's a known fact. The question is were GMCs the same way. I say yes, but they still came through mostly with leafs

[barry1982]

In my area (northern Alberta, Canada) 67-72 1/2 tons with rear leafs are rare. I have actually only seen two. One was a 71 Chevy 6 cyl , 4 speed standard, (plain Jane) and the other is my Sons 1970 GMC 1/2 ton 307 3 speed standard.
Pretty sure leafs were an option and seems it was not picked often, at least on the trucks of this era I am familiar with.

[68 50th]

Originally Posted by special-K

Yes, that's a known fact. The question is were GMCs the same way. I say yes, but they still came through mostly with leafs

That´s what I think too.

[71CHEVYSHORTBED402]

Originally Posted by special-K

Well, I'd have to scratch that source for being a good one, because that is totally wrong. Trim level had nothing to do with it and anyone who knows anything about these trucks knows that much.

Yes, that's a known fact. The question is were GMCs the same way. I say yes, but they still came through mostly with leafs

Ha, well I won't mention who it is, but he's well respected. Can't know em all I guess.

[kmfb]

I have a 1970 GMC Sierra Grande 1/2 ton 2wd with coils

[Classic v6 GMC's]

Originally Posted by kmfb

I have a 1970 GMC Sierra Grande 1/2 ton 2wd with coils

Our 1970 GMC Sierra Grande 1/2 ton 2wd has leafs. It must have been an option.

[RINC]

Just wanted to chime in and say my 69 C-20 4-speed has coils.

I was just assuming the coils were lighter duty than leaf springs.

So much yet to learn for me.

[jocko]

Originally Posted by kmfb

I have a 1970 GMC Sierra Grande 1/2 ton 2wd with coils

Does it show coils on the SPID?
OP question is whether coil or leaf was standard on GMC - so your SPID could help answer the question for 1/2 tons at least. For Chev, coils were standard on C10 and C20 (except longhorn as Tim mentions) so if one rolled off the line with leafs, it would be annotated on the SPID. So, if leafs were std on GMC, for instance, coils will be on the SPID as they would have had to have been ordered as optional equipment. If your SPID doesn’t list coils, then we can assume coils were std.

72longstepper - your SPID could also provide useful evidence (by showing no options for suspension coil vs leaf)

I have no idea why gmc would have a different suspension as standard equip compared to Chev, but this is not the first time I’ve heard the gmc/leaf story. So am interested to see your SPID kmfb.

[Fry]

My 1970 GMC sales brochure shows leafs as optional not standard. This is a Canadian brochure though if that matters.
My truck option list has G70 for “rear suspension leaf”.
It’s a stepside shortbox.

[54blackhornet]

Salesman guide shows leaf standard, coils optional. My 71 GMC 1500 has leafs and nothing showing on SPID.

[jocko]

Originally Posted by 54blackhornet

My 71 GMC 1500 has leafs and nothing showing on SPID.

That is THE data point. Thanks for checking.
If someone has a GMC with coils that also shows them listed on the SPID - that would pretty much close the case.

[Mike C]

Originally Posted by 54blackhornet

My 71 GMC 1500 has leafs and nothing showing on SPID.

My big block 1/2 ton '71 GMC is on coils. And nothing shows on the SPID.

Now there is another data point. LOL