🏷️ Basic Information Identification Make: Jeep Model: J20 Standard Cab Pickup Year: 1979 Codes Chassis Code: SJ (Full-size Jeep Pickup chassis) 👋 Introduction Market Position Vehicle Class: Full-size pickup truck, positioned for heavy-duty work and off-road capability. Era Context: Part of the robust, long-running Jeep SJ platform, known for its ruggedness and distinctive styling. Competitive Analysis Competitors 1979: Ford F-Series, Chevrolet C/K series, Dodge D Series. Jeep Advantage: Renowned 4x4 system (Quadra-Trac), iconic styling, robust chassis. Key Features Body Style: Standard Cab Pickup Drivetrain Options: Available in 2WD and 4WD configurations, with the latter featuring the advanced Quadra-Trac system. Durability Reputation: Known for its robust construction and ability to handle demanding tasks. 📋 Manual Details Coverage Areas Primary Coverage: 1979 Jeep J20 Standard Cab Pickup Secondary Coverage Vehicles: Likely covers closely related Jeep SJ platform variants of the era, including J-series pickups and Wagoneer/Cherokee models with similar powertrains. Page Count Estimated Pages: Hundreds of pages (specific count not provided, but characteristic of a full workshop manual) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Downloadable Digital Format (likely PDF) 📖 Manual Coverage Systems Covered Engine: Detailed diagnosis, repair, overhaul, and specifications for all available 1979 Jeep J20 engines. Transmission: Service and repair procedures for manual and automatic transmissions used in the J20. Drivetrain: Front and rear axles, differentials, driveshafts, transfer case (e.g., Quadra-Trac) operation and repair. Suspension: Front and rear suspension systems, including springs, shocks, bushings, and alignment procedures. Brakes: Hydraulic system, disc and drum brake components, power assist, adjustment, and repair. Steering: Power steering system, steering gearbox, linkages, and alignment. Electrical System: Wiring diagrams, charging system, starting system, ignition system, lighting, instruments, and accessories. Fuel System: Fuel tank, pump, lines, carburetor (e.g., Rochester Quadrajet, Motorcraft), and emissions controls. Cooling System: Radiator, fan, water pump, thermostat, hoses, and coolant specifications. Exhaust System: Exhaust manifolds, pipes, muffler, and catalytic converter (if applicable). Body And Chassis: Frame inspection and repair, body panel adjustments, door mechanisms, glass replacement, interior trim. HVAC: Heating, ventilation, and air conditioning system diagnosis and repair. Procedures Included Maintenance: Routine maintenance checks, lubrication, filter replacement, fluid changes, tune-ups. Troubleshooting: Diagnostic charts, symptom-based troubleshooting guides for various systems. Repair: Step-by-step instructions for component removal, installation, and repair. Overhaul: Detailed procedures for rebuilding major components like engines, transmissions, and differentials. Specifications And Measurements: Torque specifications, clearances, timing settings, fluid capacities, and diagnostic values. Wiring Diagrams: Comprehensive electrical schematics for all vehicle circuits. Technical Depth Depth: Comprehensive factory-level coverage suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Likely text-searchable, allowing for quick access to specific information. Print Quality Printability: Designed for high-quality printing, enabling users to create a physical copy. Binding Type Ideal Binding For Print: Spiral or comb binding for lay-flat usability in a workshop environment. Paper Type Recommended Paper For Print: Durable, glossy paper to withstand workshop conditions and preserve image clarity. ⚙️ Engine Specifications Primary Engine Engine Option 1: AMC 360 cu in (5.9L) V8 Engine Option 2: Jeep 258 cu in (4.2L) Inline-6 (less common in J20, more in J10) Performance Engine 360 Horsepower: Approx. 175-195 hp (varies by specific tuning and emissions controls) Engine 360 Torque: Approx. 280-310 lb-ft (varies by specific tuning and emissions controls) Fuel System Carburetor Type 360: Rochester Quadrajet 4-barrel or Motorcraft 4300D 4-barrel Fuel Type: Unleaded gasoline Technical Specs Bore X Stroke 360: 4.08 in x 3.44 in (103.6 mm x 87.4 mm) Compression Ratio 360: Approx. 8.0:1 - 8.5:1 🔧 Transmission Standard Standard Transmission Option: e.g., Borg-Warner T-18 4-speed manual Optional Optional Transmission Option: e.g., Turbo Hydramatic 700R4 (GM TH400 variant) 3-speed automatic Features Transfer Case: New Process (NP) 205 (gear-driven, part-time) or Quadra-Trac (full-time, chain-driven) 4WD transfer case. Fluid Specifications Manual Transmission Fluid: API GL-4 or GL-5 gear oil (e.g., SAE 80W-90 or 85W-140 depending on climate) Automatic Transmission Fluid: Dexron-III (or equivalent ATF) 📐 Dimensions Exterior Wheelbase: Approx. 129.7 inches (3294 mm) Length: Approx. 209.5 inches (5321 mm) Width: Approx. 79.5 inches (2019 mm) Height: Approx. 66.7 inches (1694 mm) (varies with trim/suspension) Weights Curb Weight: Approx. 4,000 - 4,500 lbs (1814 - 2041 kg) (varies significantly with configuration) Payload Capacity: Up to 2500 lbs (1134 kg) for J20 models. Gvwr: Approx. 6,000 - 7,000 lbs (2722 - 3175 kg) Tires Standard Tire Size: e.g., 9.50R16.5LT, 235/85R16 Wheels Wheel Bolt Pattern: 5x5.5 inch (5x139.7 mm) 🛡️ Safety Features Ratings Crash Test Data: No standardized crash test data available for this era of heavy-duty trucks in the modern sense (e.g., NHTSA ratings). Active Features Braking System: Front disc brakes, rear drum brakes. Power assist likely standard on J20. Passive Features Seat Belts: Standard lap and shoulder belts (driver and passenger). Roll Bar: Internal cab structure provides some rollover protection, but not a designated roll...