On this page, you will find the general dimensions of the GMC Sierra 3500 generation 2 (1998-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:

---

Dimensions in tables

Sierra truck bed dimensions

Bodystyle	Crew Cab Fleetside Long Box	Extended Cab Fleetside Long Box	Regular Cab Fleetside Long Box
Volume (cu. ft.)	70.7	70.7	70.7
Length at floor	97.6	97.6	97.6
Inside height	19.5	19.5	19.5
Width at wheelhouse	50	50	50
Maximum width at floor	64.8	64.8	64.8

Wheelbase of the Sierra:

Bodystyle	Length (inch)
Crew Cab - Fleetside Long Box	167
Extended Cab - Fleetside Long Box	157.5
Regular Cab - Fleetside Long Box	133

This model comes in 3 body styles

There are 3 bodystyles for this Sierra 3500 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 2 3500 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