I just got an 01 Yukon XL 2500 with the autoride suspension. I have just now started researching them and found there were two types of autoride suspensions. The 1500's got the air pump version while the 2500 got some type of shock that is electronically controlled with the viscosity of oil in the shock. I have found many replacements for the air pump version but not a one on the electronic. Monroe makes them but they are well over $300 each. Can anyone provide more information on good replacements for them?