2009 GMC SIERRA 2500 HD EXTENDED CAB

If you're searching for a capable, heavy-duty workhorse that can handle everything the Pacific Northwest throws at it, this 2009 GMC Sierra 2500 HD Extended Cab SLT for sale at North West Auto Empire in Kent, WA is worth a serious look. Gray exterior, a proven diesel powertrain, and a full 8-foot bed make this truck a standout option for buyers who need real capability — not just the appearance of it.

About This 2009 GMC Sierra 2500 HD Extended Cab

At 154,044 miles, this Sierra 2500 HD sits right in the sweet spot for a diesel heavy-duty truck. Diesel engines — especially the 6.6L Duramax — are built for the long haul, and trucks like this routinely reach 300,000 miles or more with proper maintenance. The extended cab body style gives you the extra rear seating room or storage space that pure work trucks often lack, while the 8-foot bed means you're never leaving a load behind. Whether you're hauling materials up to the Cascades or pulling a trailer through King County job sites, this truck was purpose-built for exactly that kind of work.

2009 GMC Sierra 2500 HD Performance and Engine

Under the hood sits a 6.6-liter Duramax turbocharged diesel V8 — one of the most respected diesel engines ever put into a pickup truck. Paired with a 6-speed Allison automatic transmission with overdrive, this is the combination that commercial operators, contractors, and serious tower operators have trusted for years. The Allison transmission in particular is legendary for its durability and smooth power transfer under heavy load — it's not a GM in-house unit, but rather a purpose-built commercial-grade gearbox.

The 4WD drivetrain ensures you'll have traction when conditions get slick — and if you've spent any time driving through Kent, Auburn, or the foothills toward Enumclaw, you know that traction in wet and snowy conditions is anything but optional. This setup delivers both the torque to tow heavy and the confidence to get there safely.

GMC Sierra 2500 HD SLT Features and Interior

The SLT trim sits near the top of the Sierra HD lineup and brings a noticeably more refined interior than base or SLE models. Expect leather-appointed seating, upgraded audio, power-adjustable front seats, and a higher level of interior finish throughout. The extended cab configuration provides fold-flat rear seats or useful rear storage — a practical bonus for tools, gear, or passengers on longer hauls.

The SLT also typically includes dual-zone climate control, a premium instrument cluster, and exterior details like chrome accents and upgraded wheels that give this work truck a polished presence without sacrificing its heavy-duty identity.

GMC Sierra 2500 HD Reliability and Ownership

The 2009 GMC Sierra 2500 HD with the Duramax/Allison combination has earned a rock-solid reputation among truck owners. The LMM-generation Duramax engine used in this model year addressed emissions compliance while maintaining strong performance, and owners consistently report that with regular oil changes, fuel filter replacements, and DEF system attention, these engines run reliably well past 200,000 miles.

Common ownership considerations include monitoring the injection system and keeping up with coolant flushes, but these are routine for any diesel at this mileage. The Allison transmission is widely regarded as one of the most durable automatics ever used in a pickup — it rarely causes problems when fluid is serviced on schedule. For buyers looking at used diesel trucks in King County, this generation of Sierra HD consistently holds its value and earns high marks for long-term dependability.

Why Buy From North West Auto Empire in Kent, WA

North West Auto Empire, located in Kent in King County, Washington, has built a reputation for offering quality used vehicles at honest prices. Kent sits at the heart of one of the most active commercial and industrial corridors in the Puget Sound region, and the team here understands what working truck buyers actually need. You won't find high-pressure tactics — just straightforward information about the vehicle, transparent pricing, and a team that wants to put you in the right truck.

Whether you're coming in from Renton, Auburn, Federal Way, or further out in King County, the dealership is easy to reach and worth the drive for a truck this capable.

Financing a Used GMC Sierra 2500 HD Near Kent

Financing a used diesel truck in the $20,000–$30,000 range is something North West Auto Empire handles regularly for buyers across King County and the greater South Sound area. Whether your credit is excellent, rebuilding, or somewhere in between, there are lending options designed to work for you. Truck buyers who also use their vehicle for business purposes may find additional financing flexibility through commercial loan products — ask the team about what applies to your situation.

Getting pre-qualified is quick, and with a truck like this, the investment is easy to justify given the long-term utility and durability of the Duramax/Allison platform.

Frequently Asked Questions

Is the 2009 GMC Sierra 2500 HD a good buy?

Yes — especially with the 6.6L Duramax diesel and Allison transmission. This powertrain combination is widely considered one of the best ever offered in a half-ton or heavy-duty pickup. With proper maintenance, these trucks provide decades of dependable service and hold their resale value well compared to other used diesel trucks.

How many miles is too many for a 2009 Duramax diesel?

Duramax diesel engines are designed for extremely high mileage. Unlike gasoline engines, diesel engines tolerate higher mileage very well when maintained correctly. A 2009 Duramax with 154,000 miles that has been properly serviced is well within its usable life — many of these trucks are still working daily at 250,000 to 350,000 miles.

What does the SLT trim include on the 2009 Sierra 2500 HD?

The SLT trim adds leather seating, power-adjustable front seats, upgraded audio, enhanced interior materials, chrome exterior trim, and other comfort and convenience features not found on the base or SLE trims. It offers the refinement of a luxury-oriented interior while retaining full heavy-duty truck capability.

What can the 2009 GMC Sierra 2500 HD tow?

The 2009 Sierra 2500 HD with the Duramax diesel and properly equipped is rated to tow up to approximately 13,000–16,000 pounds depending on configuration. The 4WD extended cab with the 8-foot bed is well suited for fifth-wheel and conventional trailer towing across a wide range of applications.

Is 4WD important for driving in the Kent, WA area?

Absolutely. The Kent and greater King County area experiences significant rainfall year-round and can see snow and ice during winter months, particularly when driving toward higher elevations. The 4WD system on this Sierra 2500 HD provides confidence and traction in conditions that can catch two-wheel-drive trucks off guard.

Serving Kent and Surrounding Areas

North West Auto Empire is proud to serve truck buyers throughout Kent and the surrounding King County communities. Shoppers regularly make the trip from Renton, Auburn, Federal Way, Covington, Black Diamond, Maple Valley, and Tukwila to check out the inventory. If you're coming down from the Eastside — Bellevue, Issaquah, or Sammamish — Kent is an easy and direct drive down I-405 or SR-167.

No matter where you're coming from in the South Sound, a truck with this level of capability and this drivetrain combination is hard to find at a fair price — and this one is worth seeing in person.

Contact North West Auto Empire Today

Ready to take this 2009 GMC Sierra 2500 HD Extended Cab SLT for a test drive? Call North West Auto Empire at (206) 725-8553 or stop by the lot in Kent, WA to see Stock #2668 in person. The team is standing by to answer questions, walk you through the vehicle's history, and help you get behind the wheel. Don't let a truck like this sit — diesel-powered, 4WD, Allison-equipped Sierra HDs at this price point move fast.