On this page you'll find the exact dimensions for the GMC Sierra Crew Cab 3500 HD generation 4, made from 2015 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 (6'6")	Long Box (8')
Volume (cu. ft.)	60.7	75.5
Length at floor	78.8	97.8
Inside height	21	21
Width at wheelhouse	50.6	50.6
Maximum width at floor	62.4	62.4

Wheelbase of the Sierra:

Wheelbase	Length (inch)
Standard Box (6'6")	153.7
Long Box (8')	167.7

Exterior dimensions of the Sierra Crew Cab:

Dimension	4x2	4x4
Overall length - Standard Box (6'6")	240.2	240.2
Overall length - Long Box (8')	259.1	259.1
Cab length	150.9	150.9
Height - Standard Box (6'6")	77.4	77.4
Height - Long Box (8')	77.9	77.9

Exterior width of the Crew Cab:

Exterior width	4x2	4x4
Overall width SRW - Standard Box (6'6")	80	80
Overall width SRW - Long Box (8')	80	80
Overall width DRW - Long Box (8')	95.9	95.9

Crew Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Min. ground clearance - Standard Box (6'6")	10.1	10
Min. ground clearance - Long Box (8')	9.7	9.6
Step-in height - Standard Box (6'6")	25.2	25.2
Step-in height - Long Box (8')	25.4	25.4
Cab length	150.9	150.9

Interior dimensions

1st row dimensions	Crew Cab
Head room	41.3
Shoulder room	65.2
Hip room	60.3
Leg room	41.3
2nd row dimensions	Crew Cab
Head room	40.6
Shoulder room	65.2
Hip room	65.5
Leg room	39

Turning circle of the Sierra:

Turning circle:	Kerb-to-kerb	Wall-to-wall
Standard Box (6'6")	50.5
Long Box (8')	54.8
Long Box (8')	55.4