2009 GMC Sierra Light-Duty Extended Cab - Dimensions
  Extended Cab, Standard Box Extended Cab, Long Box
Wheelbase (in / mm): 143.5 / 3645 157.5 / 4001
Overall length (in / mm): 230.2 / 5844 249.2 / 6325
Overall width (in / mm): 79.9 / 2029 79.9 / 2029
Overall height (in / mm)
2WD: 73.9 / 1876 73.6 / 1870
4WD: 73.7 / 1872 73.6 / 1868
Track (in / mm)
Front: 68.1 / 1730 68.1 / 1730
Rear: 67 / 1702 67 / 1702
Min. running ground clearance
2WD: 8.9 / 226 9 / 230
4WD: 9 / 228 9.3 / 240
Ground to top of load floor (in / mm)
2WD: 33.8 / 858 33.5 / 851
4WD: 33.4 / 848 33.1 / 841
Step-in height
2WD: 32.4 / 824 32.4 / 824
4WD: 32.4 / 824 32.4 / 824
Approach angle (deg)
2WD: 15.9 16.2
4WD: 16 16.4
Breakover angle (deg)
2WD: 19.6 18
4WD: 19.3 17.8
Departure angle (deg)
2WD: 24 22.8
4WD: 23.3 22
Cargo box
  Extended Cab, Standard Box Extended Cab, Long Box
Cargo volume (cu ft / L): 60.7 / 1718 75.5 / 2138
Length at floor (in / mm): 78.7 / 1999 97.82 / 2484.7
Width at floor (in / mm): 62.4 / 1586 62.4 / 1586
Width between wheel housings (in / mm): 50.6 / 1286 50.6 / 1286
Tailgate width (in / mm): 61.5 / 1564 61.5 / 1564
Inside height (in / mm): 21 / 553 21 / 553
Dimensions - Interior
  Extended Cab, Front Extended Cab, Rear
Headroom (in / mm): 41.2 / 1048 39.2 / 997
Legroom (in / mm): 41.3 / 1049 34.33 / 872
Shoulder room (in / mm): 65.2 / 1657 65.3 / 1658
Hip room (in / mm): 62.5 / 1588 61.9 / 1571.4

Capacities
  Extended Cab, Standard Box Extended Cab, Long Box
Seating: 5 or 6 5 or 6
Fuel tank (gal / L): 26 / 98 34 / 128
  Vortec 4.3L Vortec 4.8L Vortec 5.3L Vortec 6.0L
Engine oil (qt / L): 4.5 / 4.3 6 / 5.7 6 / 5.7 6 / 5.7
Cooling system (qt / L): 12.6 / 11.9 13.4 / 12.7 14.9 / 14.1 14.4 / 13.6