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2025 GMC Sierra 2500HD

Denali 2WD

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What the Denali adds over the Pro

Spec	Pro	Denali
Ground clearance	10.2 in	10.1 in
Front headroom	43.1 in	43.0 in
Second-row headroom	39.9 in	40.1 in
Second-row legroom	35.2 in	43.4 in
Overall height	79.9 in	79.8 in
Overall length	236.6 in	250.8 in
Overall width	81.8 in	81.8 in
Payload capacity	3759 lbs	3426 lbs
Front shoulder room	66.1 in	66.0 in
Second-row shoulder room	64.9 in	65.3 in
Steering type	Hydraulic power-assisted recirculating ball	Hydraulic power-assisted recirculating ball with Digital Variable Steering Assist
Tire size	LT245/75R17E ALS	LT275/65R20E OOR
Wheel diameter	17 in	20 in
Wheel material	steel	aluminum
Wheelbase	141.6 in	158.9 in

Standard here, not on the base trim: Adaptive Cruise Control with Trailering (standard on AT4 and Denali), Digital Variable Steering Assist, Front and Rear Park Assist (now available on Pro and SLE trims)

Specifications

Source: manufacturer press kit

Brakes

Front brake diameter	355 mm
Front brake type	ventilated disc
Rear brake diameter	360 mm
Rear brake type	solid disc

Dimensions Exterior

Ground clearance	10.1 in
Overall height	79.8 in
Overall length	250.8 in
Overall width	81.8 in
Wheelbase	158.9 in

Engine Basics

Aspiration	naturally aspirated
Cylinder count	8
Engine displacement	6600 cc
Fuel injection system	gdi mpi
Engine type (full description)	6.6L V-8 gasoline or E85 FlexFuel
Valve configuration	Overhead-valve, two valves per cylinder, variable valve timing

Engine Output

Horsepower	401 hp
Torque	464 lb-ft

Fuel System

Fuel tank capacity

36 gal

Headroom

Front headroom	43.0 in
Second-row headroom	40.1 in

Legroom

Front legroom	44.5 in
Second-row legroom	43.4 in

Shoulder Room

Front shoulder room	66.0 in
Second-row shoulder room	65.3 in

Steering

Steering type

Hydraulic power-assisted recirculating ball with Digital Variable Steering Assist

Suspension

Front suspension type	Short long arms independent front suspension with torsion bars
Rear suspension type	Semi-elliptic, two-stage, multi-leaf springs

Tires

Tire size

LT275/65R20E OOR

Transmission

Final drive ratio	3.7
Transmission speeds	10
Transmission type	automatic

Weights

Curb weight (maximum)	7428 lbs
Curb weight (minimum)	6203 lbs
Gross vehicle weight rating	11000 lbs
Payload capacity	3426 lbs

Wheels

Wheel diameter	20 in
Wheel material	aluminum

Standard & optional equipment

Source: manufacturer press kit

Safety4 std · 0 opt

ABS and Stabilitrak electronic stability assist
Adaptive Cruise Control with Trailering (standard on AT4 and Denali)
Front and Rear Park Assist (now available on Pro and SLE trims)
Hydraulic power-assisted Hydroboost brake booster, four-wheel disc brakes

Powertrain2 std · 1 opt

6.6L V-8 gasoline or E85 FlexFuel engine (401 hp / 464 lb-ft)
Allison 10L1000 10-speed automatic transmission
Duramax 6.6L V-8 Turbo-Diesel engine (470 hp / 975 lb-ft) optional

Chassis2 std · 0 opt

Digital Variable Steering Assist
Short long arms independent front suspension with torsion bars

Cargo1 std · 1 opt

Trailer Brake Controller (standard across all trims)
Max Towing Package (NHT) – increases diesel conventional tow rating to 20,000 lb on qualifying configurations optional

Ranked by what shoppers ask about first; standard equipment before options.

Transcribed from the manufacturer's official press kit for the 2025 Sierra 2500HD. Confirm with the window sticker for a specific unit.

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Common questions about the Denali

Source: EPA, NHTSA and manufacturer press kits

What does the 2025 GMC Sierra 2500HD Denali add over the Pro?

Against the Pro, 3 features become standard that the Pro does not and 15 published specifications differ. Both lists are on this page, taken from the manufacturer's own press material.