Engine/Trans/Diff/Suspension/Brakes Changes
2003 -3.2L V6
-5 spd 5L40E auto (3.43 gears)
-5 spd Getrag manual (3.73 gears, non-LSD)
2004 -3.6L V6 added (only used with 5 spd 5L40E auto, 3.43)
-3.2L V6 only used with 5 spd Getrag manual (3.73 gears, non-LSD)
-3.43 LSD available mid-cycle
2005 -2.8L V6 added for 05
-6 spd Aisin manual added
-3.2L dropped
-3.73 gears non-LSD dropped
2006 - manumatic shift replaces sport and winter buttons
-larger front brakes, high performance brake pads, stainless brake lines, strut tower brace available
Interior Changes
-2003, the color of the centre console/center armrest was always charcoal grey, matching the dash. 2004+ the centre console/center armrest matched the primary color, whether it was black, tan, or grey
-2004, Charcoal grey replaced with Ebony black
-2005, redesigned guage cluster
-2006, polished door sills available
-additional woodwork added to dash, and centre console around gear shift, manumatic function added
Exterior Changes
-2004 On-Star antenna redesigned and moved
translucent rear bezel replaced with body colored bezel
-2005 - new 17's offered
-2006 - sport grill, side skirts, spoiler, 18" wheels and exhuast tips added
Electronics/Luxuries changes
-2004 DVD-Nav replaces CD-NAV
-2004 power lumbar supported added