keep us posted .the rears are not hard to change .Easier than the fronts. Those sims have failed on the escalades and others he sells them for and burnt out the ride control modules per members of another cadillac forum. . I may buy a set to see what units he is using but I have replaced a couple on customers cars with the caspers with good results . For the little savings and extra work to cut and splice them in I recommend buying the proven plug and play caspers. Damage to a 2500$ control module is a high dollar risk.