I had this done at BCM too. Huge difference in compliance and feel. There is little that throws my butt off the seat now, whereas before if I hit anything sharp, like a frost heave, I would be using my ankles to hang on. Straight rate springs front and rear, Race-Tech valves and BCM's recommended shim stack. All of this was done in '03. Not sure if the revisions apply and don't really care, what I have suits me perfectly. If'n it 'aint broke, right?