On this page you'll find the exact dimensions for the GMC Sierra Regular Cab 1500 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 (Regular Cab)

Truck bed dimensions	Standard Box (6.5')	Long Box (8')
Volume (cu. ft.)	56.9	73.9
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')	119
Long Box (8')	133

Exterior dimensions of the Sierra Regular Cab:

Dimension	4x2	4x4
Overall length - Standard Box (6.5')	202.9	202.9
Overall length - Long Box (8')	221.9	221.9
Height - Standard Box (6.5')	71.2	73.8
Height - Long Box (8')	71	73.7

Exterior width of the Regular Cab:

Exterior width	4x2	4x4
Overall width - Standard Box (6.5')	78.5	78.5
Overall width - Long Box (8')	78.5	78.5
Width (mirrors folded)	81.5	81.5
Width (mirrors extended)	93.1	93.1

Regular Cab miscellaneous dimensions

Miscellaneous dimensions	4x2	4x4
Min. ground clearance - Standard Box (6.5')	10.6	8.4
Min. ground clearance - Long Box (8')	9.1	8.4
Ground to top of load floor - Standard Box (6.5')	31.6	31.6
Ground to top of load floor - Standard Box (6.5')	31.6	31.6

Interior dimensions

1st row dimensions	Regular Cab
Head room	41
Shoulder room	61.4
Hip room	63.9
Leg room	41.3