swathdiver
Full Access Member
The only G codes I have are GBA (Black), GU6 (Rear Axle 3.42 Ratio), G80 (Auto Locking Rear Differential)
If I remember right, Z-55 had the companion G-code for the leveling feature. Z95 also leveled. It's not needed for towing though. The NHT alone will do the trick.
I have the K5L and all the other goodies on my older truck but with the plain jane ZW7 suspension.