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Plan d’maintenance Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box
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Generations :Silverado 3500 HD I (facelift 2003) Crew CabSilverado 3500 HD II (GMT900) Crew Cab Long BoxSilverado 3500 HD II (GMT900) Extended Cab Long BoxSilverado 3500 HD II (GMT900) Regular Cab Long BoxSilverado 3500 HD II (GMT900, facelift 2011) Crew Cab Long BoxSilverado 3500 HD II (GMT900, facelift 2011) Crew Cab Standard BoxSilverado 3500 HD II (GMT900, facelift 2011) Extended Cab Long BoxSilverado 3500 HD II (GMT900, facelift 2011) Regular Cab Long BoxSilverado 3500 HD III (K2XX) Crew Cab Long BoxSilverado 3500 HD III (K2XX) Crew Cab Standard BoxSilverado 3500 HD III (K2XX) Double Cab Long BoxSilverado 3500 HD III (K2XX) Regular Cab Long BoxSilverado 3500 HD IV (T1XX) Crew Cab Long BedSilverado 3500 HD IV (T1XX) Crew Cab Standard BedSilverado 3500 HD IV (T1XX) Double Cab Long BedSilverado 3500 HD IV (T1XX) Regular Cab Long BedSilverado 3500 HD IV (T1XX, facelift 2024) Crew Cab Long BedSilverado 3500 HD IV (T1XX, facelift 2024) Crew Cab Standard BedSilverado 3500 HD IV (T1XX, facelift 2024) Double Cab Long BedSilverado 3500 HD IV (T1XX, facelift 2024) Regular Cab Long BedAll →
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📖Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box: the pragmatic commercial workhorse

Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box (2007-2010)

Featuring rear-hinged access doors and a full eight-foot cargo bed, the GMT900 Extended Cab Long Box represents one of the most purposeful commercial layouts in the Silverado 3500 HD lineage. It provides practical, lockable cabin space for high-value tools or occasional crew members while preserving maximum bed floor length for gooseneck haulage, bulk timber, or plant machinery. Regular and thorough Chevrolet Silverado 3500 HD maintenance is imperative to keep this multi-purpose commercial asset running reliably under heavy service demands.

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Owner notes

The reassuring points, known weak spots and deadlines you should not let slip.

Reassuring points

Reliability
  • The full eight-foot cargo bed combined with a practical Extended Cab body offers superior hauling capacity without excessive overall vehicle length.
  • The Duramax LMM diesel and Allison transmission deliver exceptional towing torque and intelligent grade braking for heavy loads.
  • Rear suicide doors provide wide 170-degree access to the rear cab floor for transporting sensitive tools and equipment securely.
  • Proven Vortec LY6 petrol alternative provides dependable fleet service with minimal electronic complexity and affordable upkeep.

Chronic weak spots

Keep an eye on
  • Extended Cab rear door mechanisms: check upper and lower latch cables, hinges, and weatherstripping for wind noise or water ingress.
  • Duramax LMM diesel emissions: verify exhaust gas temperature sensors, DPF differential pressure lines, and check for rising engine oil levels.
  • Four-wheel-drive transfer case: inspect magnesium housing for oil sweating, check encoder motor operation, and verify Auto-Trac fluid condition.
  • Rear leaf spring suspension: examine main spring leaves, helper leaf brackets, and shock absorber bushings under severe tongue weight.
  • Dual rear wheel axle assemblies: inspect full-floating axle seals, hub bearing end-play, and inner tyre tread depth consistency.

Critical deadlines

Do not miss
  • Renew Allison automatic transmission fluid and spin-on external filter every 40,000 km during heavy trailer towing operations.
  • Change engine oil and high-quality oil filter every 10,000 km, ensuring Dexos or low-ash CJ-4 specifications are adhered to.
  • Service transfer case fluid (AutoTrak II or Dexron) and both differential oils every 50,000 km to protect heavy ring-and-pinion gears.
  • Inspect and grease front suspension ball joints, steering idler/pitman arms, and driveline universal joints every 15,000 km.

Fréquences d'maintenance recommandées

Service markers for petrol/diesel versions. Exact intervals vary by engine and model year.

Oil change

Every 15 000 km

Every 1 year

Service

Every 15 000 km

Every 1 year

Brake pads

Every 30 000 km

Every 2 years

Poids ou puissance élevés : usure des number platettes accélérée sur certaines versions

Timing belt / chain

Every 100 000 km

Every 5 years

Battery (12 V)

Every 50 000 km

Every 4 years

Powertrains and average consumption

Average consumption from manufacturer data for the versions available in this generation.

Petrol and diesel powertrains
▾

Petrol, diesel or LPG versions. The intervals shown cover the usual mechanical jobs.

Silverado 3500 HD II (GMT900) Extended Cab Long Box

Estimated average budget

Mid-range cost

Servicing a Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box sits slightly above the market average (+21%).

Simple oil change~125 €
Full service~355 €
Front brake pads~170 €
Timing-belt kit~650 €
Tyres (set of 4)~450 €

* Indicative estimates for parts and labour.

Frequently asked questions about Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box

What are the common problems on the Silverado 3500 HD II (GMT900) Extended Cab Long Box?▾
Silverado 3500 HD II (GMT900) Extended Cab Long Box owners should especially watch: Extended Cab rear door mechanisms: check upper and lower latch cables, hinges, and weatherstripping for wind noise or water ingress. Duramax LMM diesel emissions: verify exhaust gas temperature sensors, DPF differential pressure lines, and check for rising engine oil levels. Garajo includes these watch points so you can act early.
When should you change the timing belt on a Silverado 3500 HD II (GMT900) Extended Cab Long Box?▾
The timing belt is usually replaced every 100,000 km or 5 years on this type of engine.
Where can I find the service book for the Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box?▾
Garajo offers a free digital service book, always up to date, with reminders and a detailed history for your Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box.
How much does it cost to service a Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box?▾
The service budget for a Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box sits slightly above the market average (+21%). Allow about 355 € for a full service, for example. Garajo estimates your budget by powertrain and tracks what you actually spend, for free.
Which Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box powertrain is best for town use?▾
This model is only available as petrol/diesel. Fuel mix: 4 petrol versions ; 4 diesel versions. In town, petrol/LPG versions are usually the better match; diesel versions make more sense with regular long journeys.
Which Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box powertrain should you choose if you mostly drive on the motorway?▾
This model is only available as petrol/diesel. Fuel mix: 4 petrol versions ; 4 diesel versions. For regular motorway use, diesel versions of this model are usually the best fit (range and refinement at a steady speed).

Compatible engine oil

Which engine oil for Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box?

These links are limited to the engines of this generation when oil data is available.

Unsure between two viscosities?5W-30 vs 0W-300W-20 vs 0W-305W-30 vs 5W-40
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