On this page you'll find the exact dimensions for the GMC Sierra Crew Cab 1500 generation 3, made from 2007 to . Below we'll list the dimensions for this pickup from verified sources. First, let's make sure you have the right dimensions in front of you:

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Dimensions in tables

Sierra truck bed dimensions (Crew Cab)

Truck bed dimensions	Short Box (5.75')	Short Box (5.75')
Volume (cu. ft.)	49.6	56.9
Length at floor	69.2	78.7
Inside height	19.5	19.5
Width at wheelhouse	50	50
Maximum width at floor	60.2	64.8

Wheelbase of the Sierra:

Wheelbase	Length (inch)
Short Box (5.75')	143.5
Standard Box (6.5')	153

Exterior dimensions of the Sierra Crew Cab:

Dimension	4x2	4x4
Overall length - Short Box (5.75')	227.5	227.5
Overall length - Standard Box (6.5')	237.2	237.2
Height - Short Box (5.75')	72.6	75
Height - Standard Box (6.5')	77	77.3

Exterior width of the Crew Cab:

Exterior width	4x2	4x4
Overall width - Short Box (5.75')	78.5	78.5
Overall width - Standard Box (6.5')	79.7	79.7
Width (mirrors folded)	81.5	81.5
Width (mirrors extended)	93.1	93.1

Crew Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Min. ground clearance - Short Box (5.75')	8.1	8.7
Min. ground clearance - Standard Box (6.5')	9.1	10.6
Ground to top of load floor - Short Box (5.75')	31.6	33.7
Ground to top of load floor - Standard Box (6.5')		33.7

Interior dimensions

1st row dimensions	Crew Cab
Head room	40.7
Shoulder room	61.4
Hip room	63.9
Leg room	41.3
2nd row dimensions	Crew Cab
Head room	40.2
Shoulder room	65.1
Hip room	61.4
Leg room	39.1