2025 GMC Sierra 3500 HD Overview

Tackle your toughest tasks around Gulfport when you invest in one of the 2025 GMC Sierra 3500 HD trim levels from Mandal Buick GMC near Biloxi. From the base model to the luxurious Denali Ultimate trim, there is something for everyone when you consider the features and engineering that go into each of these pickups. 

Read our guide to the 2025 GMC Sierra 3500 HD to learn more from Mandal Buick GMC. We will dive into the 2025 GMC Sierra HD colors so you can pick a style that suits your tastes. We’ll discuss the 2025 GMC Sierra HD towing capacity so you can determine what towing numbers you require. Furthermore, we’ll also examine the 2025 GMC Sierra 3500 HD interior dimensions so you can determine which size you need.

2025 GMC Sierra 3500 HD Trim Levels

There are six 2025 GMC Sierra 3500 HD trim levels available. They are as luxurious on the inside as they are rugged on the outside. See the top features here:

2025 GMC Sierra 3500 Pro: Starting at $49,495 MSRP*

• 6.6L V8 gas engine with Allison® 10-speed automatic transmission
• Trailering Package, trailering mirrors, and Trailer Brake Controller
• Wireless Apple CarPlay® and wireless Android Auto™ compatibility
• Available Duramax 6.6L Turbo-Diesel V8 engine with Allison 10-speed automatic transmission
• Available Adaptive Cruise Control with trailering

2025 GMC Sierra 3500 SLE: Starting at $53,595 MSRP*

• 13.4-inch diagonal center touchscreen
• 12.3-inch diagonal digital driver information center
• Traction Select System with Tow/Haul mode
• 17-inch machined aluminum wheels

2025 GMC Sierra 3500 SLT: Starting at $65,900 MSRP*

• 10-way power driver and front outboard passenger heated seats with lumbar
• Heated steering wheel
• ProGrade Trailering System with In-Vehicle Trailering App
• MultiPro Tailgate
• 18-inch machined aluminum wheels with dark grey metallic accents

2025 GMC Sierra 3500 AT4: Starting at $74,195 MSRP*

• Jet Black interior with Kalahari accents, and heated and ventilated perforated front leather seating surfaces
• 20-inch gloss-black aluminum wheels
• Off-Road Suspension Package with twin-tube Rancho shocks and skid plates
• Adaptive Cruise Control

2025 GMC Sierra 3500 Denali: Starting at $76,995 MSRP*

• 20-inch Ultra-Bright machined wheels with bright chrome inserts
• Denali-exclusive authentic open-pore wood, patterned aluminum trim and forge-perforated leather seating surfaces
• 12-way heated and ventilated power front seats

2025 GMC Sierra 3500 Denali Ultimate: Starting at $98,195 MSRP*

• Duramax 6.6L turbo-diesel V8 engine with Allison 10-speed automatic transmission
• Signature Vader Chrome grille and exclusive 20-inch Ultra-Bright machined aluminum wheels with gloss-black inserts
• Alpine Umber interior featuring full-grain leather seating, authentic open-pore Paldao wood, and 16-way power front seats with massage feature
• 12-speaker Bose Premium Series with Centerpoint surround sound
• Illuminated power assist steps and MultiPro Tailgate Audio System by KICKER

2025 GMC Sierra 3500 Engine Options

The 2025 GMC Sierra 3500 HD has two powerful engines to choose from. Their specs are listed here:

6.6L V8 Engine

• Available On: Pro, SLE, SLT, AT4, Denali
• Horsepower: 401 hp
• Torque: 464 lb-ft
• Fuel Tank Capacity: 36 gallons
• Transmission: Automatic, 10-speed

6.6L Duramax V8 Turbo-Diesel Engine

• Available On: Pro, SLE, SLT, AT4, Denali, Denali Ultimate
• Horsepower: 470 hp
• Torque: 975 lb-ft
• Fuel Tank Capacity: 36 gallons
• Transmission: Automatic, 10-speed

2025 GMC Sierra HD Colors for the Exterior

Now, we’ll dive into the 2025 GMC Sierra HD colors, so you can choose which ones meet your aesthetic tastes. Not all of these paint colors are available on all trims:

• Summit White
• Onyx Black
• Cardinal Red
• Sterling Metallic
• Downpour Metallic
• Thunderstorm Gray
• Titanium Rush Metallic
• Volcanic Red Tintcoat
• White Frost Tricoat

2025 GMC Sierra HD Towing Capacity 

Towing around Ocean Springs is a major factor in your decision to purchase a heavy-duty pickup truck. See the 2025 GMC Sierra HD towing capacity figures here:

Crew Cab

• Max Conventional Trailering – 20,000 pounds

• Max Gooseneck/5th-wheel Trailering – 31,440 pounds

Double Cab

• Max Conventional Trailering – 20,000 pounds

• Max Gooseneck/5th-wheel Trailering – 31,580 pounds

Regular Cab

• Max Conventional Trailering – 20,000 pounds

• Max Gooseneck/5th-wheel Trailering – 36,000 pounds

GMC Sierra 3500 HD Interior Dimensions

Which cab size do you need? You’ll get plenty of great features, so here are the GMC Sierra 3500 HD interior dimensions for each cab style:

Regular Cab

• Seating Capacity: 3 passengers

• Front Headroom: 43.1 inches

• Front Legroom: 44.5 inches

• Front Shoulder Room: 66.1 inches

• Front Hip Room: 60.9 inches

Double Cab

• Seating Capacity: 6 passengers

• Front/Rear Headroom: 43.0 inches/39.9 inches

• Front/Rear Legroom: 44.5 inches/35.2 inches

• Front/Rear Shoulder Room: 66.0 inches/64.9 inches

• Front/Rear Hip Room: 61.2 inches/60.2 inches

Crew Cab

• Seating Capacity: 6 passengers

• Front/Rear Headroom: 43.0 inches/40.1 inches

• Front/Rear Legroom: 44.5 inches/43.4 inches

• Front/Rear Shoulder Room: 66.0 inches/65.3 inches

• Front/Rear Hip Room: 61.2 inches/60.2 inches

Test-Drive a 2025 GMC Sierra 3500 HD for Sale in Diberville

Ready to get behind the wheel of this vaunted pickup truck? Contact us or call (228) 273-8949 to schedule a test drive with our team. In the meantime, look over our new vehicle specials to see if you could lower the price of your chosen model.