On this page, you will find the general dimensions of the GMC Sierra 1500 generation 3 (2007-to ), including cargo box dimensions. This page won't display all dimensions. If you are looking for the exact dimensions of a specific cab style, please select one below. First, let's make sure we have the right truck in front of you:

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Dimensions in tables

Sierra truck bed dimensions

Bodystyle	Crew Cab Short Box (5.75')	Crew Cab Short Box (5.75')	Extended Cab Short Box (5.75')	Extended Cab Standard Box (6.5')	Extended Cab Long Box (8')	Regular Cab Standard Box (6.5')	Regular Cab Long Box (8')
Volume (cu. ft.)	49.6	56.9	49.6	56.9	73.9	56.9	73.9
Length at floor	69.2	78.7	69.2	78.7	97.6	78.7	97.6
Inside height	19.5	19.5	19.5	19.5	19.5	19.5	19.5
Width at wheelhouse	50	50	50	50	50	50	50
Maximum width at floor	60.2	64.8	60.2	64.8	64.8	64.8	64.8

Wheelbase of the Sierra:

Bodystyle	Length (inch)
Crew Cab - Short Box (5.75')	143.5
Crew Cab - Standard Box (6.5')	153
Extended Cab - Short Box (5.75')	134
Extended Cab - Standard Box (6.5')	143.5
Extended Cab - Long Box (8')	157.5
Regular Cab - Standard Box (6.5')	119
Regular Cab - Long Box (8')	133

This model comes in 3 body styles

There are 3 bodystyles for this Sierra 1500 in our database. For exact dimensions, please click on one below:

• Crew Cab
• Extended Cab
• Regular Cab

Most truck models come in different body styles. The Sierra 3 1500 comes in 3 body styles. Typically the dimensions of different bodystyles differ slightly. The dimensions will greatly overlap, so this page will be helpful to get a general sense of sizing. You can click through to more detailed dimension pages per cab style.

Body styles generally have different cab styles, with the most common ones being the regular cab (two-door), extended cab (more space behind seats), and crew cab (four-door). Manufacturers also offer different trim types, although these will generally not affect dimensions so we don't always list them here.

GMC Sierra Crew Cab

Check the dimensions of the Crew Cab

GMC Sierra Extended Cab

Check the dimensions of the Extended Cab

GMC Sierra Regular Cab

Check the dimensions of the Regular Cab