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Old 06-13-2018, 10:56 PM   #1
Blackfyre77
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Cool K10 rear springs q and a

Ok guys, im at a loss please answer if you can. My 1970 k10, it could have come with 52 or 56 inch rear springs originally, correct? I have 2 frames one a k10 and one a k20 both have 52 inch springs, mine however under my truck has 56 inch springs. Im looking to buy a lift kit and was about to order it when i realized the kit claims to fit k20 trucks, but does not say it fits k10s. I only measured my springs to see though because i read somewhere they could be either size. My question is 56 inch springs DID come on k10s, right? I told skyjacker it was a k10 when asking about the kit and was not corrected.... the kit im looking at is a c260aksd-m - 6in. (Skyjacker) Thanks guys. Im not crazy, right?
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Old 06-14-2018, 09:19 AM   #2
Mike C
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Re: K10 rear springs q and a

I don't think the 56" spring ever came on a 69-72 K series truck. They were a '73 and up addition IME. I'm interested to see what others say.
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Old 06-14-2018, 12:43 PM   #3
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Re: K10 rear springs q and a

^^ That sounds right to me. Stock spring length is 52" and K10 & K20 packs are interchangeable as far as fit. Thickness & load capacity will vary of course.

OP, if your truck has 56" springs, they have been swapped in by a previous owner.
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Old 06-15-2018, 08:29 AM   #4
Blackfyre77
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Re: K10 rear springs q and a

Ok, so i called skyjacker again to ask about this. They say that 1969-72 used 52 or 56 on k10s, but, 1967-68 used a different length unknown to the guy i was talking to. He said they did not make a spring for those two years because with thier age and limited year range it wouldnt be profitable for them. But 56s did according to them come on some 69-72s, he says it is more or less still like a big 10 or heavy half (towing package) kind of deal, it wasnt to get around emissions like those, but still used the larger springs. Can anyone tell me what length spring was used on the rear in 67-68? Im just curious.
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Old 06-15-2018, 11:42 AM   #5
57taskforce
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Re: K10 rear springs q and a

Quote:
Originally Posted by Blackfyre77 View Post
Ok, so i called skyjacker again to ask about this. They say that 1969-72 used 52 or 56 on k10s, but, 1967-68 used a different length unknown to the guy i was talking to. He said they did not make a spring for those two years because with thier age and limited year range it wouldnt be profitable for them. But 56s did according to them come on some 69-72s, he says it is more or less still like a big 10 or heavy half (towing package) kind of deal, it wasnt to get around emissions like those, but still used the larger springs. Can anyone tell me what length spring was used on the rear in 67-68? Im just curious.
I don’t think that is correct. Im confident all 67-72 long bed 4x4 frames whether they be 1/2 or 3/4 ton are functionally identical (there may be some very small year to year changes like the 72 spring stops welded/ bolted to the drivers front spring mounts etc). 67-68 did use different spring widths that is true but I’m pretty certain the lengths were the same 52” .. I’ve never seen a 67-72 with 56s, it’s been proven on here several times that the longbed frames are identical. Ie. no longer/ shorter spring mount locations. I would Stick to the info of this site versus what some manufactures are claiming. For the 67-72s the spring capacity is determined but the number of leaves in the pack not the length of the spring.
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Last edited by 57taskforce; 06-15-2018 at 11:48 AM.
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Old 06-15-2018, 12:31 PM   #6
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Re: K10 rear springs q and a

I do trust what im told on this site, im just confused, my spring perches are factory riveted to my frame still in a location 4 inches wider than the other k10 frame i have, the other chassis i have is from a 1971 or 72, has 52 inch springs my truck is a 1970 and the springs that are on it measure 57-1/2. I know my trucks chasis is at least a 1970 chasis because it has drum front brakes and the dana 44 front pulls numbers reading 1969 for manufacture. So, it should be a 69 or 70. My truck is titled as 1970, not that things couldnt have been changed over 48 years. You are saying the spring WIDTH was the difference in 67 and 68? The lengths remained the same? My frame, also, is identical to the 71 or 72 that i have in most other ways, with the exception of no clearance dimples where the steering gear mounts, forged steel front - front leaf spring mounts instead of stamped, and the spacing of the rear leaf mounts. ALL mounts are still factory riveted in location. Im CERTAIN my frame is a 67-72 frame, and im sure it requires a spring longer than 52 inches, im just trying to be certain at this point i dont have a 67 or 68 frame which takes the springs that arent manufactured in lift form.
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Old 06-15-2018, 12:40 PM   #7
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Unhappy Re: K10 rear springs q and a

*footnote* i also have a k20 chassis which has 52 inch springs and the perches in the same location as the 71-72 k10 chassis i own. So, 1 of 3 has the longer springs. A k10 and k20 with 52" and my truck as described.
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Old 06-15-2018, 03:04 PM   #8
57taskforce
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Re: K10 rear springs q and a

Quote:
Originally Posted by Blackfyre77 View Post
I do trust what im told on this site, im just confused, my spring perches are factory riveted to my frame still in a location 4 inches wider than the other k10 frame i have, the other chassis i have is from a 1971 or 72, has 52 inch springs my truck is a 1970 and the springs that are on it measure 57-1/2. I know my trucks chasis is at least a 1970 chasis because it has drum front brakes and the dana 44 front pulls numbers reading 1969 for manufacture. So, it should be a 69 or 70. My truck is titled as 1970, not that things couldnt have been changed over 48 years. You are saying the spring WIDTH was the difference in 67 and 68? The lengths remained the same? My frame, also, is identical to the 71 or 72 that i have in most other ways, with the exception of no clearance dimples where the steering gear mounts, forged steel front - front leaf spring mounts instead of stamped, and the spacing of the rear leaf mounts. ALL mounts are still factory riveted in location. Im CERTAIN my frame is a 67-72 frame, and im sure it requires a spring longer than 52 inches, im just trying to be certain at this point i dont have a 67 or 68 frame which takes the springs that arent manufactured in lift form.
You have my attention!! Can you post some pictures of what youíve got? The frame not being dimpled makes me wonder if itís a 67. Have you tried to dig for the partial vin stamped on the drivers frame rail by the steering box? some of the earlier trucks donít have that stamping.
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'98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6"RCD 315/75/16's
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Old 06-15-2018, 03:20 PM   #9
Mike C
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Re: K10 rear springs q and a

If memory serves, the 67-68 springs were 56-58" long somewhere. Sounds like that 70 chassis might actually be a 67-68.
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Old 06-17-2018, 12:06 AM   #10
Blackfyre77
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Re: K10 rear springs q and a

Quote:
Originally Posted by 57taskforce View Post
You have my attention!! Can you post some pictures of what youíve got? The frame not being dimpled makes me wonder if itís a 67. Have you tried to dig for the partial vin stamped on the drivers frame rail by the steering box? some of the earlier trucks donít have that stamping.
Yes, i have looked for that stamping, and no it is not there. When i first got the truck i tried to find it.
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Old 06-17-2018, 12:22 AM   #11
Blackfyre77
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Re: K10 rear springs q and a

Well, i hope my lift i ordered will fit, i bought the 56 inch springs. I can always relocate the brackets if necessary, but i didnt want to remove the factory rivets. If the width is different, i have the brackets on the other frames. One way or the other ill be ok i guess, i just wanted to know what i had. Its becoming clear that my truck is very pieced together, which is really pretty ok with me, i never plan to sell anyway, and its more of a sand dune toy than an investment truck, i just happen to like this body style more than any other. I put a 400sbc with a th400 and np205 in it anyway and when i bought it it had a 250 with an sm465 and np205 in it, so im obviously not too concerned with originality, i just want a nice truck that is what i want to have. I own a 72 k5 blazer as well, i just love that body style chevy, my wife wants a suburban i just havent found the right deal on one yet for her. I will take some photos of the frame and spring perches to show you guys what im talking about since i have some interest in that when i get it up on the hoist tomorrow, let me know what you think. Those numbers on the frame should be on the top flat of the frame over the gearbox, correct?
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Old 06-17-2018, 12:41 AM   #12
57taskforce
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Re: K10 rear springs q and a

Quote:
Originally Posted by Blackfyre77 View Post
Well, i hope my lift i ordered will fit, i bought the 56 inch springs. I can always relocate the brackets if necessary, but i didnt want to remove the factory rivets. If the width is different, i have the brackets on the other frames. One way or the other ill be ok i guess, i just wanted to know what i had. Its becoming clear that my truck is very pieced together, which is really pretty ok with me, i never plan to sell anyway, and its more of a sand dune toy than an investment truck, i just happen to like this body style more than any other. I put a 400sbc with a th400 and np205 in it anyway and when i bought it it had a 250 with an sm465 and np205 in it, so im obviously not too concerned with originality, i just want a nice truck that is what i want to have. I own a 72 k5 blazer as well, i just love that body style chevy, my wife wants a suburban i just havent found the right deal on one yet for her. I will take some photos of the frame and spring perches to show you guys what im talking about since i have some interest in that when i get it up on the hoist tomorrow, let me know what you think. Those numbers on the frame should be on the top flat of the frame over the gearbox, correct?
Yes please do! This could be informative to all of us. Sounds like youíve got a heck of a project going! Yes the partial vin if there should be above the steering box on the top of the frame. My 72 also has a partial on top of the frame on the drivers rail right under the drivers door but I donít think you Cavan see it with the cab on.
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'98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6"RCD 315/75/16's
'01 Suburban LT K2500 Vortec 496/4l85E 240,000 and counting- drive train still all original.
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Old 06-17-2018, 04:26 PM   #13
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Re: K10 rear springs q and a

FWIW, I measured my '69 today, and the springs are 52". The springs are not original, but the hangers are.
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Old 06-17-2018, 08:32 PM   #14
Blackfyre77
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Re: K10 rear springs q and a

Quote:
Originally Posted by 57taskforce View Post
Yes please do! This could be informative to all of us. Sounds like youíve got a heck of a project going! Yes the partial vin if there should be above the steering box on the top of the frame. My 72 also has a partial on top of the frame on the drivers rail right under the drivers door but I donít think you Cavan see it with the cab on.
Ok guys, i took some pictures of my truck today, though i didnt stay working on it for long, temperature was close to 100į outside. Well, unfortunately i have lots of good photos for you all, but it pulls a security issue when i try to download them from my mobile device.
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