On this page you'll find the exact dimensions for the GMC Sierra Crew Cab 3500 HD generation 5, made from 2019 and currently still being produced. 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.)	61	76.3
Length at floor	78.9	97.8
Inside height	21.2	21.2
Width at wheelhouse	51	51
Maximum width at floor	64.6	64.6

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
Length - Standard Box (6'6")	239.5	239.5
Length - Long Box (8')	258.4	258.4
Height SRW - Standard Box (6'6")	78.3	78.1
Height SRW - Long Box (8')	77.9	78.1
Height DRW - Long Box (8')	77.8	77.8

Exterior width of the Crew Cab:

Exterior width	4x2	4x4
Width SRW - Standard Box (6'6")	80.5	80.5

Crew Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Front track - Standard Box (6'6")	68.8	68.8
Front track - Long Box (8')	68.8	68.8
Rear track SRW - Standard Box (6'6")	67.3	67.3
Rear track SRW - Long Box (8')	67.3	67.3
Rear track DRW - Long Box (8')	75	75

Interior dimensions

1st row dimensions	Crew Cab
Head room	42.8
Shoulder room	64.8
Hip room	60.7
Leg room	45.3
2nd row dimensions	Crew Cab
Head room	40.5
Shoulder room	64.3
Hip room	60.2
Leg room	40.9