I agree with HillCat-how in the world will a 20# winch lower the machine 2-3"???? That is crazy! The springs on my 'Cat (2000 model) were too soft stock, but even with 100+ lbs., they didn't drop THAT much! -as for the adjustable shocks from AC-they are brand new for this year-several of us have been begging for stiffer shocks, this looks like what they came up with. Progressive makes HD springs for the SP, or what they call "snow plow" shocks, you can find them at www.highlifter.com
, but again, nothing for AC. I modified mine by intalling a home made "spring spacer" under the bottom retaining plate of the spring itself. I believe this is what they are referring too as the "rubber donut", and is really easy to do, just takes about 20 minutes of your time, and are considerably cheaper than the new springs. We're talking a couple dollars tops, compared to a couple hundred dollars for new spring/shock assembly.
Best of Luck,