On this page you'll find the exact dimensions for the GMC Sierra Crew Cab 2500 HD & 3500 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	Standard Box (6.5')	Long Box (8')
Volume (cu. ft.)	56.9	70.7
Length at floor	78.7	97.6
Inside height	19.5	19.5
Width at wheelhouse	50	50
Maximum width at floor	64.8	64.8

Wheelbase of the Sierra:

Wheelbase	Length (inch)
Standard Box (6.5')	153
Long Box (8')	167

Exterior dimensions of the Sierra Crew Cab:

Dimension	4x2	4x4
Overall length - Standard Box (6.5')	237.3	237.3
Overall length - Long Box (8')	256.2	256.2
Height - Standard Box (6.5')	77	77.4
Height - Long Box (8')	77	77

Exterior width of the Crew Cab:

Exterior width	4x2	4x4
Overall width - Standard Box (6.5')	79.7	79.7
Overall width - Long Box (8')	79.7	79.7

Crew Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Min. ground clearance - Standard Box (6.5')	8.7	8.9
Min. ground clearance - Long Box (8')	8.7	8.8
Step-in height - Standard Box (6.5')	24.6	25.1
Step-in height - Long Box (8')	24.9	25.1

Interior dimensions

1st row dimensions	Crew Cab
Head room	41
Shoulder room	65.2
Hip room	61.4
Leg room	41.3
2nd row dimensions	Crew Cab
Head room	39
Shoulder room	65.1
Hip room	62.9
Leg room	39.1

Turning circle of the Sierra:

Turning circle:	Kerb-to-kerb	Wall-to-wall
Single-wheel pickups	49.6
Dual-wheel pickups	53.5