Positioning:
The GMC Topkick occupied a niche in the medium-duty truck market, often serving as a chassis for specialized applications like RV conversions, commercial box trucks, and heavy-duty pickups, bridging the gap between consumer pickups and heavy commercial trucks.
Competitors:
Competed with vehicles like the Chevrolet Kodiak (its sibling), Ford F-Series Super Duty chassis cab, and other medium-duty truck platforms from manufacturers such as Freightliner and Isuzu.
Notable Features:
Robust chassis construction, heavy-duty powertrains, higher towing and payload capacities than light-duty trucks, often available with more powerful diesel engines.
Primary Coverage:
Comprehensive owner's information for the 2007 GMC Topkick.
Specific Sections:
Introduction, Instrument Cluster, Entertainment Systems, Climate Controls, Lights, Driver Controls, Locks and Security, Seating and Safety Restraints, Driving, Customer Assistance, Reporting Safety Defects (U.S. only), Cleaning, Maintenance and Specifications, Engine Compartment, Engine Oil, Battery, Fuel Information, Air Filter(s), Part Numbers, Refill Capacities, Lubricant Specifications, Accessories.
Estimated Page Count:
Approximately 300-400 pages (typical for medium-duty trucks of this era).
Digital Format:
PDF Download
Powertrain:
Engine operation, fluid specifications, fuel system, air intake system.
Chassis:
Braking system basics (owner level), steering system basics, suspension basics.
Electrical:
Instrument cluster operation, lighting systems, basic electrical features (e.g., wipers, horn), entertainment systems.
Interior:
Climate controls, seating and safety restraints, locks and security, driver controls.
Routine Maintenance:
Engine oil checks and replenishment, battery checks, air filter checks, fluid refill procedures.
Operational Guidance:
Proper driving techniques, operation of vehicle controls, understanding dashboard indicators.
Safety Information:
Seat belt usage, child restraint systems, general safety precautions, reporting safety defects (US).
Depth:
Owner-level maintenance and operation. Does not include detailed diagnostic procedures or repair instructions typically found in a service manual.
Software Requirement:
PDF Reader (e.g., Adobe Acrobat Reader, Foxit Reader)
Quality:
Digital reproduction of original factory manual, ensuring clarity of text and images.
Binding:
Not Applicable (Digital Download)
Paper Type:
Not Applicable (Digital Download)
Engine Options 2007:
Commonly equipped with Duramax 6.6L V8 Turbo Diesel engines (e.g., LBZ or early LMM variants depending on GVWR and specific configuration). Gasoline V8 options may have been available in certain configurations.
Duramax 6.6L Turbo Diesel Torque:
Typically in the range of 520-605 lb-ft, depending on the specific Duramax engine variant (LBZ/LLY/LLM).
Duramax 6.6L Turbo Diesel Horsepower:
Typically in the range of 300-360 hp, depending on the specific Duramax engine variant.
Diesel Fuel Type:
Diesel Fuel (refer to manual for specific cetane requirements and cold-weather additives).
Gasoline Fuel Type:
Unleaded Gasoline (if equipped).
Transmission Options:
Often equipped with Allison 1000 or 2000 series 5-speed automatic transmissions for diesel models. Manual transmissions may have been available on specific configurations.
Optional Transmissions:
Heavy-duty manual transmissions were an option on some configurations.
Allison Features:
Torque converter lock-up, electronic range selection, Tow/Haul mode.
Wheelbase Options:
Highly variable, ranging from approximately 130 inches to over 200 inches depending on chassis configuration and intended application.
Gvwr Range:
Typically falls within Class 4, 5, and 6 GVWR ratings, ranging from 14,500 lbs up to 33,000 lbs or more depending on configuration.
Curb Weight:
Highly variable based on configuration, but generally ranging from 6,000 lbs to over 10,000 lbs.
NHTSA Ratings:
As a medium-duty truck platform, formal NHTSA crash test ratings comparable to light-duty vehicles were less common or structured differently. Focus was on structural integrity and occupant protection within its class.
Braking System:
Hydraulic disc brakes with ABS (Anti-lock Braking System) were standard. Air brakes were available on higher GVWR configurations.
Restraint Systems:
Frontal airbags for driver and passenger, three-point seat belts.
Child Safety:
Provisions for child seat installation (LATCH system not typically present in this class; seat belts used for child restraint attachment).
Audio Systems:
Factory radio systems, typically AM/FM with CD player. Cassette players might have been present in early configurations. Auxiliary input jacks and premium sound systems were often optional.
Navigation:
Optional factory-installed navigation systems were available on higher trim levels or as standalone options.
Towing Features:
Integrated trailer brake controller provisions (often optional), Tow/Haul mode on automatic transmissions.
Power Outlets:
12V auxiliary power outlets for charging devices.
Engine Oil Change Diesel:
Typically 5,000 to 10,000 miles or 6 months, depending on operating conditions (severe vs. normal) and oil type used. Refer to specific manual for exact intervals.
Fuel Filter Replacement Diesel:
Recommended at intervals typically between 15,000 and 30,000 miles, or annually, with crucial importance for diesel fuel systems. Consult manual for exact interval and specific part number.
Engine Oil Diesel:
API CJ-4 or newer specified diesel engine oil, typically SAE 15W-40 or 5W-40 synthetic for colder climates. Specific viscosity and API rating crucial.
Coolant Type:
Extensive Life (ELC) or OAT (Organic Additive Technology) coolant, typically a heavy-duty extended-life coolant (e.g., Dex-Cool compatible or similar heavy-duty formulation).
Transmission Fluid Allison:
Dexron III or Dexron VI (check manual for specific Allison transmission fluid requirement). For heavier duty applications, Allison approved TES 295 fluid is often recommended.
Duramax Diesel Egr:
EGR (Exhaust Gas Recirculation) cooler failures and related issues can occur, particularly with high mileage or if not properly maintained.
Duramax Diesel Injectors:
Fuel injector issues can arise with age and mileage, often related to fuel quality or system contamination.
Engine Oil Filter Example:
Example part numbers: ACDelco PF2232 (common for Duramax), WIX 57712XP. Always verify with vehicle VIN and manual.
Air Filter Example:
Example part numbers: ACDelco A1545C, WIX 49002. Always verify with vehicle VIN and manual.
Engine Oil Capacity Diesel:
Approximately 10-12 quarts (9.5-11.4 liters) for the 6.6L Duramax V8. Exact capacity specified in the manual.
Coolant Capacity:
Highly variable based on engine and cooling system configuration, typically in the 6-8 gallon range. Refer to manual.
Transmission Fluid Capacity Allison:
Approximately 12-15 quarts (11.4-14.2 liters) for Allison 1000/2000 series. Exact capacity specified in the manual.
Gmc Truck Legacy:
GMC has a long history of producing trucks, including heavy-duty and commercial vehicles, with a reputation for durability and capability.
Topkick Lineage:
The Topkick nameplate evolved from earlier GMC medium-duty truck lines. For 2007, it was part of the GMT560 platform, shared with Chevrolet.
Production Period:
The GMC Topkick (and Chevrolet Kodiak) were produced from the early 2000s until approximately 2009. The 2007 model year falls within this generation.
