Did you notice the additions and deletions for 2005? :
Chevrolet Truck Avalanche
Deletions
(PDH) Driver Convenience Package <---What!!!!
Electrochromic feature from inside rearview mirror
Exterior color (47U) Dark Green Metallic
New Features
(ZM9) Universal Transmitter
(UM

Sound system, ETR AM/FM stereo with CD player,
Touch-screen Navigation Radio (TNR)
(CWB) Chrome Exterior Package
(GU6) Rear axle, 3.42
Exterior color (15U) Sandstone Metallic
Exterior color (26U) Bermuda Blue Metallic
New LS and LT Interior trims
New LT badging
Changes
(JF4) Pedals, power adjustable, are now available on 1SJ, 1SK, 1SL, and 1SN
(UK3) Steering wheel controls now standard on all equipment groups
(UE1) OnStar is now standard on all equipment groups
(CF5) Sunroof no longer available with (AE7) Seats, 40/20/40 split-bench
(U42) Entertainment system no longer available with (AE7) Seats, 40/20/40 split-bench
Mirrors and door handles are Black on 1SJ and 1SK equipment groups and Color-keyed on 1SL, 1SM and 1SN equipment groups
(A95) Seats change from front Sport Leather seat inserts to front Leather seat inserts