I plan on putting this lift on once the 20% off coupon hits. I was quoted $900 for installation plus the cost of the lift kit at my local Chevy dealership. The CV axles issue was explained to me like this: the longer CV axles are important because they allow you to retain (safely) the ability to use the AWD/4HI on your truck after the lift. When you lift your truck a few inches, without doing a differential drop, the increased angle on the short axles causes an increased possibility of failure. Other lift companies actually do talk about this and some caution against using 4hi. I have no real world experience with this.