Manual Coverage
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Systems Covered
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Engine:
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Diagnosis, repair, and overhaul of gasoline and diesel engines, including cooling, lubrication, fuel, ignition/pre-ignition, and emissions systems.
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Drivetrain:
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Front and rear axle assemblies, transfer case (NVG 246, NVG 261 HD, NVG 263 HD), driveshafts, differentials, and hub assemblies.
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Transmission:
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Repair and overhaul of automatic transmissions (e.g., 4L70E, 4L80E, Allison 1000/2000) including torque converter, valve body, and electronic controls.
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Brakes:
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Hydraulic brake system (ABS, EBD), disc brake component inspection and replacement, drum brake service (if applicable), parking brake system.
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Steering:
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Power steering system, steering gear box, steering linkage, wheel alignment specifications.
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Suspension:
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Front independent suspension (torsion bar), rear leaf spring suspension, shock absorbers, ball joints, control arms, stabilizer bars.
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Electrical:
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Battery, charging system, starting system, lighting, instrumentation, power accessories, fuses, relays, wiring diagrams for all systems.
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Body:
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Body panels, doors, hood, tailgate, bumpers, glass, interior trim, seat mechanisms, HVAC system (heater, A/C).
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Diagnostics:
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On-Board Diagnostics (OBD-II), Diagnostic Trouble Codes (DTCs), guided troubleshooting procedures, component testing.
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Procedures Included
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Maintenance:
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Scheduled maintenance tasks including oil changes, filter replacements, fluid checks and top-offs, lubrication, brake inspection, tire rotation.
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Repair:
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Step-by-step repair instructions for virtually all mechanical and electrical components, from minor adjustments to complete component overhauls.
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Troubleshooting:
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Systematic diagnostic approaches for identifying and resolving common and uncommon faults, symptom-based troubleshooting trees.
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Specifications:
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Torque values, fluid types and capacities, electrical specifications, diagnostic data, wear limits, and alignment settings.
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Disassembly Reassembly:
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Detailed instructions for the removal, inspection, and installation of all major components and sub-assemblies.
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Technical Depth
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Depth:
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Comprehensive, covering from basic maintenance to advanced diagnostics and complete component rebuilds, suitable for professional technicians and advanced DIY enthusiasts.
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Engine Specifications
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Primary Engine
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Gasoline Engine 1:
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6.0L V8 Vortec (L96/LQ4)
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Gasoline Engine 1 Hp:
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Approx. 360 hp @ 5400 rpm
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Gasoline Engine 1 Torque:
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Approx. 380 lb-ft @ 4200 rpm
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Diesel Engine 1:
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6.6L V8 Duramax Turbodiesel (LMM)
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Diesel Engine 1 Hp:
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Approx. 365 hp @ 3200 rpm
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Diesel Engine 1 Torque:
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Approx. 725 lb-ft @ 1600 rpm
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Performance
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Emission Control:
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Includes procedures for catalytic converters, EGR systems (Duramax), particulate filters (Duramax), and oxygen sensors.
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Fuel System
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Gasoline Fuel System:
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Sequential Fuel Injection (SFI), electronic throttle control (ETC).
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Diesel Fuel System:
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Common Rail Diesel Injection (CRDI), high-pressure fuel pump, injectors, glow plug system.
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Maintenance
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Service Intervals
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Oil Change Gas:
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Every 5,000 - 7,500 miles or 6 months (check oil life monitor).
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Oil Change Diesel:
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Every 5,000 - 7,500 miles or 6 months (check oil life monitor), especially under heavy use.
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Transmission Fluid Service:
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Inspect fluid condition at regular intervals. Replace fluid and filter typically every 50,000 - 100,000 miles, depending on usage and manufacturer recommendation.
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Fluid Specifications
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Engine Oil Gas 6.0L:
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SAE 5W-30 synthetic blend or full synthetic.
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Engine Oil Diesel 6.6L:
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SAE 15W-40 or 5W-40 synthetic diesel engine oil meeting API CJ-4 specification.
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Transmission Fluid 4L70E:
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Dexron VI Automatic Transmission Fluid.
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Transmission Fluid Allison:
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TES 295 approved synthetic fluid (e.g., Mobil Delvac Synthetic Transmission Fluid 727, Allison Transmission Fluid).
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Coolant:
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GM Dex-Cool (Orange) 50/50 coolant/water mixture.
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Known Issues
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Duramax Egr:
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EGR cooler failures and clogging are common issues requiring cleaning or replacement.
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Duramax Dpf:
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Diesel Particulate Filter (DPF) regeneration issues and clogging can occur, especially with short trips.
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Transfer Case Actuator:
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Potential failure of the electronic transfer case actuator, leading to 4WD engagement issues.
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Brake Wear:
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Front brake pad and rotor wear can be accelerated due to the vehicle's weight and towing/hauling duties.
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