🏷️ Basic Information

Make:

GMC

Model:

Sierra HD 2500 / 3500 Pickup Truck

Model Year Range:

2007-2009

Platform Code:

GMT900 (HD variants)

👋 Introduction

Market Segment:

Heavy Duty Pickup Truck segment, aimed at commercial use, towing, and heavy payload applications

Branding:

GMC positions the Sierra HD line as 'Professional Grade', emphasizing durability, capability, and suitability for demanding work environments.

Competitors:

Ford F-Series Super Duty (F-250, F-350), Ram Heavy Duty (2500, 3500)

Target Audience:

Do-it-yourselfers, independent repair shops, fleet maintenance personnel

Manual Benefit:

Cost-effective way to maintain and repair the vehicle, ensuring longevity and optimal performance

Content Quality:

Easy-to-read text, high-quality diagrams, step-by-step instructions, exploded views

📋 Manual Details

Model Coverage:

All GMC Sierra HD 2500 and 3500 Pickup Truck models

Engine Coverage:

All engines offered for the 2007-2009 Sierra HD models

Transmission Coverage:

All transmission types offered for the 2007-2009 Sierra HD models

Trim Level Coverage:

All trim levels

Estimated Page Count:

Extensive (typically 2500+ pages for full factory service manuals)

Type:

Factory Service Repair Manual / Workshop Manual

Additional Manual Types:

Contains diagnostic procedures, specifications, component locations, and torque values.

Language:

English

Format:

PDF

Searchability:

Likely searchable text within the PDF, enhancing ease of finding specific information.

📖 Manual Coverage

Powertrain:

Engine mechanical, fuel system, ignition system, cooling system, exhaust system, emissions control, lubrication system

Transmission Drivetrain:

Automatic and manual transmissions, transfer case, driveshafts, axles, differentials

Chassis:

Suspension (front and rear), steering system, braking system (including ABS and stability control), wheels and tires

Electrical Electronics:

Engine control module (ECM), body control module (BCM), instrument cluster, lighting, infotainment system, power accessories, charging system, starting system, wiring diagrams

Body Interior:

Body construction, exterior panels, doors, glass, interior trim, seats, HVAC system, airbags

Tire And Wheel:

Tire specifications, wheel torque, balancing, alignment procedures

Body And Frame:

Frame inspection and repair, body panel replacement, collision repair data.

Maintenance:

Routine maintenance, fluid checks and changes, filter replacements, lubrication

Repair Rebuild:

Engine overhaul, transmission disassembly and reassembly, brake component replacement, suspension component repair, electrical component diagnosis and repair

Troubleshooting:

Diagnostic procedures for various symptoms, electrical system diagnosis using wiring diagrams, engine performance issues, transmission malfunctions

Diagnostics:

On-board diagnostic (OBD-II) system information, diagnostic trouble codes (DTCs), testing procedures for sensors and actuators

Emission Control Systems:

Diagnosis and repair of catalytic converters, oxygen sensors, and other emissions components.

Calibration:

Procedures for recalibrating sensors and modules after component replacement (e.g., steering angle sensor, ABS sensors).

Depth:

Comprehensive (covers everything from basic maintenance to complete vehicle disassembly and reassembly)

Wiring Diagrams:

Detailed electrical schematics and wiring diagrams for all vehicle systems.

📊 Manual Specifications

File Type:

PDF

Printability:

Printable without restriction

Binding Format:

Digital (Downloadable PDF)

Digital Media:

PDF Reader required (Adobe Acrobat Reader recommended for optimal display of images/graphics)

⚙️ Engine Specifications

Engine Options:

6.0L Power Stroke V8 Turbo Diesel, 6.6L Duramax V8 Turbo Diesel (LBZ/LMM variants), 6.0L Vortec V8 Gasoline, 8.1L Vortec V8 Gasoline

Horsepower Range:

Varies by engine, typically 300-360 hp for diesel, 323-366 hp for gasoline

Torque Range:

Varies by engine, typically 520-650 lb-ft for diesel, 373-505 lb-ft for gasoline

Diesel Fuel System:

Common Rail Direct Injection (for Power Stroke and Duramax)

Gasoline Fuel System:

Multi-port Fuel Injection (MPFI)

Cooling Capacity:

Refer to manual for specific engine capacities (typically 20-25 quarts for diesel)

Oil Capacity:

Refer to manual for specific engine capacities (e.g., 15 quarts for 6.6L Duramax, 12 quarts for 6.0L Vortec)

Oil Specification:

Refer to manual for specific engine oil viscosity and API service classification (e.g., API CJ-4 or CK-4 for diesel, API SN for gasoline)

Gasoline Engine Codes:

Vortec 6.0L (L76, L96), Vortec 8.1L (L18)

Diesel Engine Codes:

6.0L Power Stroke (V8), 6.6L Duramax (LLY, LBZ, LMM)

🔧 Transmission

Standard Transmission:

Depending on configuration, may include Allison 1000/2000 series 5/6-speed automatic or manual transmissions for gasoline variants.

Optional Transmission:

Allison 1000 (5-speed automatic, 2007-2008), Allison 2000 (6-speed automatic, 2009 diesel), possibly manual transmissions for gasoline models.

Diesel Transmission Features:

Heavy-duty construction, tow/haul mode, advanced electronic controls

Automatic Transmission Fluid:

Dexron-VI (for most GM transmissions of this era)

Manual Transmission Fluid:

Refer to manual for specific viscosity and type (e.g., synthetic manual transmission fluid)

📐 Dimensions

Wheelbase Options:

Multiple wheelbase options available (e.g., 133.5", 143.5", 153.5", 167.5" for 2500HD, longer for 3500HD)

Overall Length:

Varies significantly with cab and bed configuration

Body Styles:

Regular Cab, Extended Cab (Crew Cab), Long Bed, Short Bed

Bed Length Options:

Approx. 6.5 ft (short bed) and 8 ft (long bed)

Gvwr:

Exceeds 8,500 lbs (specific to payload package and configuration)

Curb Weight:

Varies significantly by configuration, typically 6,000 - 7,500+ lbs

Axle Weight Ratings:

Specific front and rear Gross Axle Weight Ratings (GAWR) are critical for HD trucks and detailed in the manual.

🛡️ Safety Features

NHTSA Ratings:

Refer to NHTSA website for specific model year ratings; typically good frontal impact ratings for this era.

ABS:

Standard Anti-lock Braking System

Stability Control:

Available StabiliTrak electronic stability control system

Airbags:

Frontal airbags, available side-impact airbags

Seatbelts:

Three-point safety belts with pretensioners

💡 Technology Features

Infotainment System:

Base audio systems, optional CD player, available premium audio with subwoofer. Navigation systems were less common and often aftermarket on these models.

Driver Assistance Features:

Cruise control, trailer brake controller provisions.

Connectivity Options:

OnStar system available on certain trims and model years.

🔧 Maintenance

Oil Change Interval:

Typically 5,000-7,500 miles for gasoline, 5,000-10,000 miles for diesel, or based on oil life monitoring system.

Tire Rotation:

Every 5,000-7,500 miles

Transmission Fluid Change:

Refer to manual; typically 50,000-100,000 miles depending on usage (towing heavy loads may require more frequent changes).

Coolant Specification:

GM P/N 12346795 or equivalent, Dex-Cool compatible (long-life orange coolant)

Brake Fluid Specification:

DOT 3

Power Steering Fluid:

GM P/N 89021184 or equivalent, Dexron-VI compatible

Common Diesel Issues:

Early 6.0L Power Stroke (2007-2008) may experience EGR cooler failures, injector issues, and turbocharger problems. 6.6L Duramax (LMM) can have issues with injector seals and glow plug harnesses.

Common Gasoline Issues:

Potential for intake manifold gasket leaks, spark plug blow-out (especially on early 6.0L Vortec), and camshaft position sensor issues.

Common Powertrain Issues:

Allison transmission reliability is generally high, but can experience issues if not maintained properly. Driveshaft U-joints can wear.

Oil Filter Example:

ACDelco PF2047 or equivalent (for gasoline) / ACDelco PF1314 or equivalent (for diesel - consult manual for exact fitment)

Air Filter Example:

ACDelco A1461C or equivalent (for gasoline) / ACDelco A3090C or equivalent (for diesel - consult manual for exact fitment)

📚 Vehicle History

Gmc Truck Legacy:

GMC has a long-standing history of producing robust and capable trucks, often positioned as professional-grade vehicles.

Sierra Hd Lineage:

The Sierra HD replaced the GMC Sierra C/K HD lineup. The 2007-2009 models are part of the first generation of the GMT900 platform HD trucks, which introduced significant updates in styling, interior, and capability over the previous generation.

Chassis Design:

Robust ladder frame construction designed for heavy-duty use, coupled with improved suspension geometry for better ride and handling compared to previous generations.

Manufacturing Locations:

North American assembly plants (e.g., Fort Wayne, Indiana; Silao, Mexico)

🏆 Awards & Recognition

Awards And Accolades:

While specific awards for these exact model years might be varied, the GMT900 platform trucks generally received positive reviews for their towing and hauling capabilities, and the Allison transmissions were highly regarded.