On this page you'll find the exact dimensions for the GMC Sierra Regular Cab 2500 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 (Regular Cab)

Truck bed dimensions	Long Box (8')
Volume (cu. ft.)	75.5
Length at floor	97.8
Inside height	21
Width at wheelhouse	50.6
Maximum width at floor	62.4

Wheelbase of the Sierra:

Wheelbase	Length (inch)
Long Box (8')	133.7

Exterior dimensions of the Sierra Regular Cab:

Dimension	4x2	4x4
Overall length - Long Box (8')	225	225
Cab length	116.5	116.5
Height - Long Box (8')	77.6	77.6

Exterior width of the Regular Cab:

Exterior width	4x2	4x4
Overall width - Long Box (8')	80	80

Regular Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Min. ground clearance - Long Box (8')	9.8	9.75
Step-in height - Long Box (8')	26.3	26.3
Cab length	116.5	116.5

Interior dimensions

1st row dimensions	Regular Cab
Head room	41.3
Shoulder room	65.2
Hip room	60.3
Leg room	41.3

Turning circle of the Sierra:

Turning circle:	Kerb-to-kerb	Wall-to-wall
Long Box (8')	44.9