We had the full Banks kit, including Transcommand, on our 1996 460 (Southwind 36 w/ tag axle) and the engine performed quite well. Transmission still had that huge gap between 2nd and 3rd, though. Once you drop below the RPM range for 3rd, it's 2nd gear and 20 mph. That deficiency can be solved by adding a Gear vendors Over/Underdrive auxiliary transmission, but now you are`talking more big bucks. We traded for a new rig and a Workhorse W22 instead.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL