03-28-2002, 03:31 PM | #1 |
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42.5" !!
cool ! i just got under the 79 C20 with 14 bolt FF and under the 82 K10 with 10 bolt rea,r and both are 42,5" center to center on leaf packs, which is same as 67-72 2wd 1/2 and 3/4 ton ! we need to keep this info somewhere ! need someone to measure up a 73-87 C10 now, and also blazers. oh wait i have a 78 rear axle i can measure that on
cool stuff! ------------------ Randy- Lincoln, IL randy@ccaonline.com -71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it- -'84 Z28 H.O. 305 L69 700R4 GT4 3.73 - 1984 Firebird SE 2.8L T-5 GT4 3.73 -1981 Cutlass Supreme, dunno what im gonna do with it yet... -79 G20 pass van, 350/th350/10bolt *Paint is overrated © RSS Enterprises 2000 |
03-28-2002, 09:12 PM | #2 |
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Fast-
Does this mean that all we would need to do is weld on mounts to accept the coils instead of the leaf springs? I wonder if all the other junk would connect right up? I thought about looking at the panhard on a more modern truck to see if it mounted the same as the one I need. But I don't know if leaf sprung vehicles even have a pan hard set up, do they? If I run across the year you need measured I'll check it out for ya. ------------------ 67 Chevy C20 LB Stepside, 350 4-bolt with goodies.
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03-28-2002, 09:22 PM | #3 |
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Do you know what the center-to-center on a '70 C-20 with leafs is?
------------------ Sylvan Lake, Alberta, Canada 1970 Chevy C20 Custom Camper #s matching 402BB Turbo 400 trans. Air conditioning, power steering, manual brakes. 73,600 Original Miles!!
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03-28-2002, 09:25 PM | #4 |
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Oh wait, I re-read your post. So the diff in my truck should be 42.5" center-to-center? Does that mean that a 12 bolt from a late '70s to '87 truck should bolt in?
Now you should measure drum to drum on these trucks!! Thanks for the info....its muchly needed! Reid
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1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH) |
03-28-2002, 10:04 PM | #5 |
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67blacksheep, these measurement are for leaf trucks only, and only 64-72 trucks used coil sprinf panhrd bar type suspension, not 73-up
drum to drum measurement is less than 1.5" difference from 72 to 73 on all axles, they are nothing much different at all, same chassis for the most part besides frame rail channels width and wheelbase, but have different body and body mount frame brackets is all. i just measured c to c on the 78 Big 10 12 bolt axle and its also 42.5", so ... good deal... only tihng would have to do is relocate shock mounts on all these 73-up axles to put them under a 67-72, would have to use 73-up U bolt upper plates the ones iwth the four holes that sit directly on top of the spring packs which are a better design anyways. 42.5" is what is on the 1/2 and 3/4 ton 2wd 67-82 -or even later maybe- trucks, and also same on K-10 73-up and C20 73-up, but i cant say for sure on the K20 trucks 73-up. [This message has been edited by Fast68Chevy (edited March 29, 2002).] |
03-29-2002, 01:04 AM | #6 |
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anyone have any comments or info to add to this maybe ? for some reason I always had thought- maybe cuz i had seen other places with ppl who said that 73-up axles spacing was not same- that the 73-up were just a hair off on pad spacing compared to ours, but they actually arent. hmm.... i think i had measure up the 78 axle before but that was before i had ever come across a leaf rear 67-72 10 or 20 truck to measure... |
03-29-2002, 03:15 AM | #7 |
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Leaf spring rear ends don't have the pan hard bar, because they can't move around like a coil spring rear end can. Hope this helps. I had a junk yard tell me once that a leaf spring rear in a 67 thru 72 are the same as 73 and ups. Have never measured them though.
------------------ Andy 71's Are for ever!!! or 67,68,69,70,72 http://geocities.com/chevy71tpi/main.html
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03-29-2002, 10:45 AM | #8 |
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Not sure if I got what you wrote correct but are you saying that the leaf pad mounts are the same in the 67-72 as the 73 and up?
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03-29-2002, 11:49 AM | #9 |
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Andy, I am not talking about coil spring axle,s at all
what I have been saying, or trying to say, is that 67-72leaf axles have the same spring pad spacing as on the 73-up axles whicch are all leaf i have not been talking about coil spring 67-72 axles the only problem is that the pads arent the same in design, but that can be fixed by using 73-up top plates and U bolts if swapping to a 73-up axle. then you have to relocate the shock brackets [This message has been edited by Fast68Chevy (edited March 29, 2002).] |
03-29-2002, 12:00 PM | #10 |
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Fast 68,I have a 79 K 20 with the same spacing(42.5).....69 longhorn.
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03-29-2002, 01:08 PM | #11 |
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Fast thats what I thought you said but I wasnt sure. On my 70 gmc 3/4 2 wd the spacing on rear axle c to c is 41.5, on a 67 4x4 it is 40.5, on my 69 4x4 Im not sure the distance but when I put 73-87 axles on it I had to move the spring pads about a inch to get them to line straight up an down and not at a angle.
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03-29-2002, 04:49 PM | #12 |
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Overdrive,the 1 tons.....including the longhorns are 40" C to C. It is my understanding that the 4 X 4s share the same spacing. I havent been into the older 4 X4s,so cant sat for sure.....69 longhorn.
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03-29-2002, 05:28 PM | #13 |
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Could be. I'm not sure what axle or ratio is in the 3/4 Gmc as I can find no numbers anywhere on it to identify it.
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03-30-2002, 11:17 PM | #14 |
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Well guys, the spacing on my '69 K10 was 40" and the spacing on the 14FF from my '77 was 42.5" so I had to move the spring pads in and remount the shock mounts. Go Figure!
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03-31-2002, 12:16 AM | #15 |
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I have a 69 GMC with leaf springs and 12 bolt rear. I will measure in the morning. I hope that 73 and up will fit. That would be great! I'll post what I find.
------------------ Mitzki5 69 GMC Shortbed Central, Illinois
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03-31-2002, 01:07 AM | #16 |
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A newer axle will bolt right up to a 2wd. A 4x4 is narrower and you will have to reweld the spring pads.
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