On this page you'll find the exact dimensions for the GMC Sierra Double Cab 2500 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 (Double 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	21.1	21.1
Width at wheelhouse	51	51
Maximum width at floor	64.6	64.6

Wheelbase of the Sierra:

Wheelbase	Length (inch)
Standard Box (6'6")	144.2
Long Box (8')	158.1

Exterior dimensions of the Sierra Double Cab:

Dimension	4x2	4x4
Length - Standard Box (6'6")	230	230
Length - Long Box (8')	248.9	248.9
Height - Standard Box (6'6")		78.1
Height - Long Box (8')	77.9

Exterior width of the Double Cab:

Exterior width	4x2	4x4
Width SRW - Standard Box (6'6")	80.5	80.5
Width SRW - Long Box (8')	80.5	80.5

Double 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

Interior dimensions

1st row dimensions	Double Cab
Head room	42.8
Shoulder room	64.8
Hip room	60.7
Leg room	45.3
2nd row dimensions	Double Cab
Head room	38.7
Shoulder room	64.3
Hip room	60.2
Leg room	34.6