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Old 06-22-2005, 12:38 AM   #1
tomatocity
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Rear leaf springs

I looked at a 1970 C10 that has rear leaf springs.
-What is the history for the rear leaf springs?
-Why would one truck have leaf springs and the other has rear coil springs?
-What is the best way to lower a 1970 C10 with rear leaf springs?
Thanks in advance. Tim
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Old 06-22-2005, 01:35 AM   #2
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I can't answer many questions, but to lower it, flip the rear axle from under the springs to on top of them like a car or S10 would have. That will lower it 5 inches or so. I've always assumed that the leafs were ordered to haul more. Coil trucks don't seem to take a load as well. There were a lot more coil trucks if I recall correctly.
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Old 06-22-2005, 01:50 AM   #3
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Thank you. That confirms what I was thinking. I have seen flip kits but I have never seen it done. Would I have to have the spring perches relocated to the top of the axle housing? 5" would mean C-notch the frame. Would this mean I need to use 2.5" drop spindles and 1" front lowering springs to get the truck level?

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Originally Posted by muddpile
I can't answer many questions, but to lower it, flip the rear axle from under the springs to on top of them like a car or S10 would have. That will lower it 5 inches or so. I've always assumed that the leafs were ordered to haul more. Coil trucks don't seem to take a load as well. There were a lot more coil trucks if I recall correctly.
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Old 06-22-2005, 06:00 AM   #4
JIMs70GMC
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You could also remove leaves, or get longer shackles. It seems the chevies were coil and gmc leaves with the other being an option for both. I have a dan60 rear w/ leaves out of a 71 C20. Of course the 4wds all had rear leaves.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.

1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm
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Old 06-22-2005, 07:19 AM   #5
A.P.
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Some info on leaf springs and coils.
http://www.earlyclassic.com/Tech.asp...=Spring%20Time
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Old 06-22-2005, 03:53 PM   #6
tomatocity
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Thanks for the link. This is something all of us should read. Excellent!

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Originally Posted by A.P.
Some info on leaf springs and coils.
http://www.earlyclassic.com/Tech.asp...=Spring%20Time
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