Last night I installed the Moog 81071 springs on my Z55 Yukon (Arnott air shocks and Bilstein 4600 front) Easy, disconnected an air line to a shock, removed lower shock bolts, removed upper sway bar link bolts. Jack up one side the spring just falls out. Isolators were surprisingly in good shape.
Out the truck, the Moog were a hair shorter side by side to the worn out springs with 286k miles. Ride wise it much better and not swaying side to side on the road, its not sagging and the air pump doesn't run every time I start the truck. They are not overly firm, probably what factory was like. The raised the rear maybe 1" after settling down over night. Im curious what the ACDelco 45H2165 pro springs ride like since they have a variable spring rate vs the Moog's constant rate. Overall Im happy and towing should be more enjoyable and less floaty feeling.
ETA: Oops, wrong subforum. I will repost in the NBS. Sorry.