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#1 |
Florida Edition
![]() ![]() Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,025
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Need front spring height advice
I have a 70 GMC factory BB402 that I put 2-1/2" drop spindles on with new stock height big block springs and new 3/4 ton shocks all from American Classic. I am transfering every thing to a 67 short bed chassis and I want to lower it only 3/4" more. I think I can do this by cutting maybe 1/8 of a coil off or less. I need some advice so I don't go too low and ruin the springs. Any help would be apreciated. Would 1/2 ton stock shocks help? Also if anyone has a part # for the front sway bar mounting plates for lowered trucks, that would be great. Thanks
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70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#2 |
Florida Edition
![]() ![]() Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,025
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Re: Need front spring height advice
Any opinions on this?
Here is what I'm thinking 1 coil eq. 2 to 2-1/2" 1/2 coil eq. 1 to 1-1/2" 1/4 coil eq. 1/2 to 3/4"? Posted via Mobile Device
__________________
70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#3 |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Re: Need front spring height advice
I think you are on the right track with your formula. Getting "exactly" 3/4" is going to be more luck than science though. If you want to be conservative then cut a 1/4 coil and run it for a bit to allow it to settle.
Personally, I think I would be tempted to cut 1/2 a coil and see what happens.
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Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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#4 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Need front spring height advice
Keep in mind that the relationship between the amount you cut and the amount you drop isn't linear. This is because the spring gets stiffer as it gets shorter. If you think of the spring as a torsion bar wound into a coil this might make more sense.
Ray
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Live more responsibly. Eat lower on the food chain. Eat vegetarians. |
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#5 |
Florida Edition
![]() ![]() Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,025
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Re: Need front spring height advice
Thanks everyone. When I do it I'll let you know how it turns out.
Any help on the front sway bar mounting plates for lowered trucks? I saw them in a build thread in here somewhere, I searched....and searched.....and.... can't find it again, should have taken notes!
__________________
70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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