Got some numbers today on the Superlift for the HD Crew Cab.
My cost on the 6" Superlift w/ front drive line is $1,885.00. Keep in mind that I am not factory direct. I buy through a warehouse at a small dicsount off jobber pricing. I'm quite sure my cost is about what you could buy it for out of a magazine. Bastards!
Anyway, hopefully that will give you some idea of what to expect to pay to have it done. I generally charge $600 labor just to put an IFS lift on.
I need to check w/ my buddy at the Chevy dealer about the speedo calibration.