Cut springs are OK, but just remember the original spring has probably sagged a little over the years. So, say you put new 2" drop springs in it you're only going to get .75-1" net drop over where it is right now.
Also, the coil spring will become stiffer if you cut it. The ride might be a little harsh compared to stock. The spring is just a straight piece of metal wire all coiled up .. right? Think of it like a diving board that's 8ft long. 250lb guy jumps on the end.. the board will flex, then he goes in the pool.
Now cut two feet off the board. The same guy dives off. The board will not flex as much, he won't go as high.. but it still flexes.. make sense?
I'd suggest 1/2 a turn and try it first. A full turn will gibe you about 2-2.5" drop. Its more than just the height of one coil to the next.. remember you're cutting out that tension in the extra coil too.. not just the height overall.
Just trying to help.

Later.
__________________
Chad
1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway*
1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold *
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1986 Silverado Short Fleet -
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1985 Silverado Short Fleet *Sold*
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2001 Jeep Cherokee XJ 4x4 - Lifted, Built
1992 Jeep Cherokee XJ 4x4 - Lifted
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