GMC

GMC Sierra 2500HD Bed Sizes & Dimensions

Inside bed length, width between the wheel wells and depth for the GMC Sierra 2500HD, 1999 to today — plus which camper shells and tonneau covers swap between years. The current truck comes with 6'9" or 8'2" beds.

This page lives at /sierra-1500/ for historical reasons — it covers the Sierra 2500HD.

2020–present Sierra 2500HD

Spot-check

Bed	Cabs	Length at floor	Max width	Between wheel wells	Depth	Volume
Standard Box 6'9" nominal	Double Cab, Crew Cab	82.2″	71.4″	50.8″	21″	—
Long Box 8'2" nominal	Regular Cab, Double Cab, Crew Cab	98.3″	71.4″	50.8″	21″	—

Top view. Depth (floor to rail): 21.0″

Camper shell & cover swaps

Same bed box as:

A shell from one of these trucks with the same bed length should sit on the rails, but cab height, back-window angle, tailgate type and rail caps can still stop it from fitting. Confirm with the shell maker before you buy.

Compare this bed →

The 2020+ HD bed is different from the 2019+ 1500 bed — HD and 1500 shells are not interchangeable in this generation.
Dually (DRW) 3500s use the Long Box with wider outer fenders; inside dimensions are the same.

2015–2019 Sierra 2500HD

Spot-check

Bed	Cabs	Length at floor	Max width	Between wheel wells	Depth	Volume
Standard Box 6'6" nominal	Double Cab, Crew Cab	78.9″	62.3″	50.6″	22.4″	—
Long Box 8'0" nominal	Regular Cab, Double Cab, Crew Cab	97.8″	62.3″	50.6″	22.4″	—

Top view. Depth (floor to rail): 22.4″

Camper shell & cover swaps

Same bed box as:

Compare this bed →

Same bed box as the 2014–2018 Silverado/Sierra 1500.

Older Sierra 2500HD bed sizes (1999–2006)

From our original tables. Bed width is inside rail to inside rail; length is from the front bed wall at the floor to the end of the bed. Wheel wells take up space inside these numbers.

Sierra 2500 · 2003–2006 — 6 configurations

Years	Cab (GMC term)	Universal cab	Bed (GMC term)	Universal bed	Length	Width at cab	Width at tailgate
2003–2006	Regular Cab	Regular	Short	Short	77.5″	63.69″	62″
2003–2006	Regular Cab	Regular	Long	Long	96.63″	63.69″	62″
2003–2006	Extended Cab	Extended	Short	Short	77.5″	63.69″	62″
2003–2006	Extended Cab	Extended	Long	Long	96.63″	63.69″	62″
2003–2006	Crew Cab	Crew	Short	Short	77.5″	63.69″	62″
2003–2006	Crew Cab	Crew	Long	Long	96.63″	63.69″	62″

Sierra 2500 · 2001–2002 — 6 configurations

Years	Cab (GMC term)	Universal cab	Bed (GMC term)	Universal bed	Length	Width at cab	Width at tailgate
2001–2002	Regular Cab	Regular	Short	Short	77.5″	63.69″	62″
2001–2002	Regular Cab	Regular	Long	Long	96.63″	63.69″	62″
2001–2002	Extended Cab	Extended	Short	Short	77.5″	63.69″	62″
2001–2002	Extended Cab	Extended	Long	Long	96.63″	63.69″	62″
2001–2002	Crew Cab	Crew	Short	Short	77.5″	63.69″	62″
2001–2002	Crew Cab	Crew	Long	Long	96.63″	63.69″	62″

Sierra 2500 · 1999–2000 — 4 configurations

Years	Cab (GMC term)	Universal cab	Bed (GMC term)	Universal bed	Length	Width at cab	Width at tailgate
1999–2000	Regular Cab	Regular	Short	Short	77.5″	63.69″	62″
1999–2000	Regular Cab	Regular	Long	Long	96.63″	63.69″	62″
1999–2000	Extended Cab	Extended	Short	Short	77.5″	63.69″	62″
1999–2000	Extended Cab	Extended	Long	Long	96.63″	63.69″	62″

Owner fit reports

Add yours

Swapped a shell, fit a tonneau, or measured your bed? Tell other owners what worked. Approved reports appear here.

All Sierra 2500HD reports →