Cutting the spring will make it stiffer, but my experience was that it doesn't really make it stiff enough. Maybe it's okay on the trucks? I had endless bottoming problems on the Tahoe Limited with spindles, springs with a coil cut, and c notch/flip in the rear. Ended up with C2500 diesel front springs with a coil cut and express van 3500 shocks (similar factory spring rate but shorter) to get the front closer to where I want it, though I could still use some more damping. ZQ8 bump stops are great, too.
A lot of the aftermarket stuff seems to put you on or nearly on the bump stops with only an inch or two of bump travel. It is a little counter intuitive, but my experience has been that the ride quality with a stiffer setup that keeps you off the stops is much better than with a softer setup that is always hitting the end of travel. Good shocks also make a massive difference vs. cheap or poorly matched stuff. It all has to work together as a system.
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