🏷️ Basic Information Identification Make: Jeep / Ford Model: GPW (Willys MB counterpart) Codes Model Code: GPW Military Designation: 1/4 ton 4x4 Truck 👋 Introduction Market Position Original Market: World War II Allied Military Vehicle Current Market: Collector Vehicle, Off-Road Enthusiast Vehicle, Military Vehicle Restoration Competitive Analysis Competitor Models: Willys MB, Bantam GP Key Features Design Philosophy: Robust, simple, reliable, highly mobile 4x4 utility vehicle Durability: Built for extreme conditions and extensive use Iconic Status: Recognized globally as a symbol of American wartime ingenuity and capability 📋 Manual Details Coverage Areas Primary Coverage: Mechanical, Electrical, Bodywork, and Maintenance Secondary Coverage: Troubleshooting, Specifications, Unit Repair Page Count Estimated Page Count: 200+ Manual Type Type: Service Manual / Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Willys-Overland Go Devil (L-134) Engine Transmission: Warner T-90 3-speed manual transmission Drivetrain: Dana 25 front axle, Dana 44-7 (or similar) rear axle, Spicer 1350/1355 series driveshafts Suspension: Front and Rear Leaf Spring Suspension Braking System: Hydraulic Drum Brakes (Front and Rear) Electrical System: 12-volt system, Lucas/Bosch electrical components, wiring diagrams Fuel System: Carburetor (likely Carter WDB-726), fuel pump, tank Cooling System: Radiator, fan, water pump, hoses Bodywork: Chassis, body panels, tub construction, fenders Procedures Included Maintenance: Lubrication, fluid changes, filter replacement, tune-up procedures Repair: Engine overhaul, transmission rebuild, brake system repair, electrical component replacement Troubleshooting: Diagnostic procedures for common and uncommon issues Specifications: Torque values, clearances, dimensions, fluid capacities Assembly Disassembly: Detailed steps for component removal and installation Technical Depth Depth: Comprehensive, covering basic maintenance to complete engine and transmission rebuilds Detail Level: Detailed exploded views and step-by-step instructions 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable if properly digitized Print Quality Printability: Printable for workshop use Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-4 Cylinder, Overhead Valve (OHV) Engine Code: L-134 (Go Devil) Displacement: 134.2 cubic inches (2.2 Liters) Bore X Stroke: 3-1/8" x 4-3/8" (79.4mm x 111.1mm) Compression Ratio: 6.5:1 (approx.) Performance Horsepower: 60 HP @ 4000 RPM (approx.) Torque: 105 lb-ft @ 2000 RPM (approx.) Fuel System Carburetor Model: Carter WDB-726 (or equivalent) Fuel Type: Gasoline (Octane rating to be specified by manual) Fuel Pump Type: Mechanical 🔧 Transmission Standard Type: Warner T-90 3-speed manual Transfer Case: 2-speed, 4x4 engagement (e.g., Spicer 18) Features Gear Ratios: 1st: 2.59:1, 2nd: 1.55:1, 3rd: 1.00:1, Reverse: 3.32:1 (approx.) Clutch Type: Single plate, dry friction disc 📐 Dimensions Exterior Wheelbase: 80 inches (2032 mm) Length: 132.75 inches (3372 mm) Width: 62.25 inches (1581 mm) Height: 53.5 inches (1359 mm) (to top of windshield frame, without canvas) Weights Curb Weight: 2,350 lbs (1066 kg) (approx.) Payload Capacity: 800 lbs (363 kg) (approx.) Gross Vehicle Weight: 3,325 lbs (1508 kg) (approx.) Other Ground Clearance: 8.7 inches (221 mm) (approx.) Tire Size: 6.00 x 16 (standard) Wheelbase Track Front: 56.5 inches (1435 mm) Wheelbase Track Rear: 56.5 inches (1435 mm) 🛡️ Safety Features Ratings Crash Test Ratings: Not applicable (military vehicle, pre-dates modern safety standards) Active Features Active Safety: None (basic utility vehicle) Passive Features Passive Safety: Robust chassis, limited driver protection due to open-top design Specifics Braking System Type: Hydraulic drum, internal expanding 💡 Technology Features Infotainment Infotainment System: None (basic utilitarian vehicle) Lighting Headlights: Standard sealed beam headlights Illumination: Minimal interior lighting 🔧 Maintenance Service Intervals Oil Change Interval: As specified in the manual, likely every 1,000-2,000 miles or 3-6 months Grease Points: Regular lubrication of chassis and suspension components (daily/weekly as per military doctrine) Tune Up Interval: As needed, typically based on ignition system condition Fluid Specifications Engine Oil Grade: SAE 10W or SAE 10W-30 (specific grade to be confirmed by manual) Engine Oil Capacity: 5 Quarts (4.7 Liters) with filter Transmission Fluid Type: GL-1 gear lubricant (or equivalent) Transmission Fluid Capacity: Approximately 2.5 Pints (1.2 Liters) Transfer Case Fluid Type: GL-1 gear lubricant (or equivalent) Transfer Case Fluid Capacity: Approximately 2.5 Pints (1.2 Liters) Axle Fluid Type: GL-1 or GL-5 gear lubricant (differential specific, check manual) Brake Fluid Type: DOT 3 Hydraulic Brake Fluid (or original specification) Coolant Type: Water (during wartime) or water with rust inhibitor (modern use) Known Issues Common Wear Items: Brake systems, clutch components, kingpins, universal joints, ignition points Engine Reliability: Generally reliable but requires regular maintenance; potential for carbon buildup and valve guide wear Transmission Wear: Synchros can wear, requiring careful shifting; input shaft seals are prone to leaks Maintenance Philosophy Philosophy: Preventative maintenance and field repairability are paramount 📚 Vehicle History Brand Heritage Parent Company: Ford Motor Company Ford Contribution: Mass production of the standardized 4x4 utility vehicle design during WWII Model Evolution Predecessors: Bantam GP, Willys MB Standardization: Developed to meet US Army specifications for a standardized light reconnaissance vehicle Production Production Period: 1941-1945 Ford Production Volume:...