2 generation 2001–2009 4.2 AT 2001 → 4.2 AT 2WD 2001 → 4.2 AT 4WD 2001 → 4.2 AT XL 2001 → 4.2 AT XL 4WD 2001 → 4.2 AT XUV 4WD 2001 → 4.2 MT 2WD 2001 → 4.2 MT 4WD 2001 → 5.3 AT 2001 → 5.3 AT 2WD 2001 → 5.3 AT Denali XL 2WD 2001 → 5.3 AT Denali XL 4WD 2001 →