🏷️ Basic Information

Make:

Dodge

Model:

Ram 50

Year:

1990

Chassis Code:

This generation, based on the Mitsubishi Mighty Max, is often referred to by its internal Mitsubishi platform designation, though a specific common code for the Ram 50 variant itself isn't as widely cited as for some other vehicles.

👋 Introduction

Market Position:

A vital resource for owners and independent repair shops seeking accurate, factory-level repair information for the 1990 Dodge Ram 50, an increasingly popular classic compact pickup truck. Positioned as a modern, convenient, and cost-effective alternative to outdated print manuals.

Competitive Analysis:

Competes directly with other online service manual providers and traditional printed service manuals. Its advantage lies in licensed, OE-derived data, modern accessibility across multiple devices, and potentially more up-to-date or searchable content than legacy print formats. Competitors might include Haynes, Chilton, and other digital manual providers.

Key Features:

Licensed OE data, year-round access, compatibility with PC, laptop, smartphone, tablet, accessible via web browser, detailed repair procedures, maintenance schedules, troubleshooting guides, diagnostic information, cost savings compared to shop repairs, convenient online format.

Model Lineage:

The Ram 50 is part of Dodge's lineage of compact and mid-size trucks, which later evolved into the Dakota and full-size Ram series. This particular model bridged the gap for smaller, more fuel-efficient truck needs.

📋 Manual Details

Coverage Areas:

Engine, Drivetrain, Suspension, Steering, Brakes, Electrical System, HVAC, Bodywork, Fuel System, Cooling System, Exhaust System, Diagnostic Procedures, Maintenance Schedules, Troubleshooting

Page Count:

Not explicitly stated, but online software implies comprehensive coverage equivalent to a substantial printed manual (typically 500-1500+ pages for a full factory service manual).

Manual Type:

Service and Repair Manual Software (Online)

Language:

English

Format:

Online Software / Web-based Access

📖 Manual Coverage

Systems Covered:

Engine mechanical (including disassembly, inspection, assembly, timing), Engine fuel and emission control systems, Cooling system, Lubrication system, Ignition system, Starting system, Charging system, Transmission (manual and automatic), Clutch, Driveshafts, Differentials, Axles, Suspension (front and rear), Steering system, Brake system (including hydraulic, mechanical, and parking brake), Wheels and tires, Body (interior and exterior components, body panels, glass, locks), HVAC system (heating, ventilation, air conditioning), Electrical system (wiring diagrams, components, lighting, instrumentation), Chassis components, Diagnostic trouble codes (DTCs) and troubleshooting procedures.

Procedures Included:

Routine maintenance (oil changes, filter replacements, fluid checks), Tune-up procedures, Engine repair and overhaul, Transmission repair and overhaul, Brake system inspection and repair, Suspension component replacement, Steering system adjustments and repair, Electrical system diagnostics and repair, HVAC system servicing, Body panel alignment and repair, Drivetrain component servicing, Troubleshooting common driveability issues, Component testing and specifications.

Technical Depth:

Comprehensive factory-derived information covering everything from basic preventive maintenance to complete engine and transmission rebuilds. Includes detailed diagnostic procedures, electrical schematics, component specifications, tolerances, and torque values essential for professional-level repairs.

Diagnostic Trouble Codes:

The manual will cover how to read and interpret diagnostic trouble codes (DTCs) if the vehicle is equipped with an OBD-I or early OBD-II system, or through manual diagnostic procedures like checking for flash codes or using a multimeter on specific circuits.

Electrical Schematics:

Detailed wiring diagrams for all major vehicle systems, including engine management, lighting, charging, starting, instrumentation, power windows/locks (if equipped), and HVAC controls.

Chassis And Body:

Covers frame inspection, body panel removal and installation, door mechanisms, hood and tailgate operation, glass replacement, upholstery, and trim components. Also includes frame alignment and repair basics.

📊 Manual Specifications

File Format:

Web-based access requiring an internet connection and web browser. No specific file format like PDF is mentioned, implying dynamic online content.

Print Quality:

N/A (Online access, not a printed product. Content is digitally displayed.)

Binding Type:

N/A (Online access, not a physical book.)

Paper Type:

N/A (Online access, not a physical book.)

⚙️ Engine Specifications

Primary Engine:

2.4L 4G64 I4 (Mitsubishi designation). This engine was known for its robustness and relatively good power output for its class.

Performance:

Approximate figures for the 2.4L engine: Horsepower: 118-123 hp @ 4,500-5,000 rpm. Torque: 145-150 lb-ft @ 2,500-3,000 rpm. (Actual figures can vary slightly by specific configuration and emissions standards).

Fuel System:

Multi-point Fuel Injection (MPI). Features electronic fuel injectors controlled by the Engine Control Unit (ECU).

Engine Code:

4G64 (Mitsubishi designation for the 2.4L engine)

Bore Stroke:

Approx. 86.5 mm bore x 100 mm stroke. (Refer to manual for exact specifications).

Compression Ratio:

Typically around 8.5:1 to 9.0:1 for the 2.4L engine. (Refer to manual for exact specifications).

Firing Order:

1-3-4-2 for inline-4 engines.

Ignition System:

Distributor-based electronic ignition system with vacuum and centrifugal advance, controlled by ECU. Coil-on-plug systems were not common in this era for this vehicle.

Cooling System Capacity:

Approximately 7-8 quarts. (Refer to manual for exact specifications).

🔧 Transmission

Transmission:

5-speed Manual Transmission. Known for its durability and straightforward operation.

Transmission:

4-speed Automatic Transmission. Offered for enhanced driver comfort, particularly in urban environments.

Features:

Both transmissions typically featured a rear-wheel-drive (RWD) layout as standard. Some models might have offered an optional four-wheel-drive (4WD) system, which would require specific transfer case and drivetrain coverage in the manual.

Gear Ratios Manual:

Specific gear ratios vary by transmission model and intended application. A typical 5-speed might have ratios like: 1st: ~3.5-4.0, 2nd: ~2.0-2.5, 3rd: ~1.3-1.5, 4th: ~1.0, 5th: ~0.8-0.9. Final Drive Ratio: ~4.07 to 4.88. (Consult manual for precise ratios).

Gear Ratios Automatic:

A typical 4-speed automatic might have ratios like: 1st: ~2.8-3.0, 2nd: ~1.5-1.7, 3rd: ~1.0, 4th: ~0.7-0.8. Final Drive Ratio: Similar to manual transmission. (Consult manual for precise ratios).

Clutch Type:

Dry single-plate clutch with diaphragm spring.

📐 Dimensions

Exterior:

Varied depending on cab configuration (regular cab, club cab) and bed length (short bed, long bed). Wheelbase typically ranged from approximately 109 to 116 inches. Overall length and width would also vary.

Interior:

Seating capacity typically 2-3 in regular cab configurations. Features would include basic automotive appointments for the era: manual windows, manual locks, bench seat standard, optional bucket seats.

Cargo:

Bed lengths typically around 6.5 feet (short bed) and 7.5 feet (long bed). Payload capacity varied but was generally in the range of 1,000-1,500 lbs, suitable for light-duty applications.

Weights:

Curb weight typically ranged from 2,800 to 3,500 lbs, depending on configuration and engine. Gross Vehicle Weight Rating (GVWR) would be higher, reflecting payload capacity.

Wheelbase Short Bed:

Approx. 109.1 inches

Wheelbase Long Bed:

Approx. 116.1 inches

Tire Size Standard:

Commonly P205/75R15 or P215/75R15. (Check specific trim/options). 4WD models might use slightly larger tires.

Wheel Bolt Pattern:

5 x 114.3 mm (5 x 4.5 inches)

Wheel Offset:

Typically around +40mm to +46mm. (Consult manual for precise specifications).

🛡️ Safety Features

Ratings:

Safety standards and testing in 1990 were less stringent than today. Specific crash test ratings from NHTSA or IIHS for the 1990 Ram 50 are not readily available or comparable to modern standards. Features were basic for the era.

Active Features:

Front Disc Brakes, Rear Drum Brakes. Power assisted brakes often standard on higher trims. Manual or power steering.

Passive Features:

Seat belts (lap and shoulder belts in most positions), potentially an energy-absorbing steering column. Airbags were not standard or widely available in this model year/segment.

Brake System Front:

Ventilated Disc Brakes

Brake System Rear:

Drum Brakes

Parking Brake:

Mechanical drum brake acting on rear wheels, operated by a hand lever.

💡 Technology Features

Infotainment:

Basic for its era. Typically featured an AM/FM radio, often with a cassette tape player. Speaker count and quality were standard for the segment. Options might have included premium sound systems or a digital tuner.

Driver Assistance:

Very limited by modern standards. No electronic stability control, traction control, or advanced driver-assistance systems (ADAS). Features would be limited to what was mechanically or electrically available.

Connectivity:

No factory connectivity features such as Bluetooth, USB ports, or smartphone integration. Aftermarket solutions would be required for these capabilities.

🔧 Maintenance

Service Intervals:

Typical intervals (consult manual for exact specifications): Oil Change: 3,000-5,000 miles or 6 months. Oil Filter: Every oil change. Air Filter: 15,000-30,000 miles. Fuel Filter: 30,000-60,000 miles. Spark Plugs: 30,000-60,000 miles (depending on type). Coolant Flush: 30,000-50,000 miles. Transmission Fluid: 30,000-60,000 miles (manual and automatic). Brake Fluid: Every 2-3 years. Timing Belt: Critical component, often specified around 60,000-90,000 miles due to interference engine design; failure can cause severe engine damage.

Fluid Specifications:

Engine Oil: API SG or SH, SAE 10W-30 (check manual for specific ambient temperature recommendations). Coolant: Ethylene glycol based, typically a 50/50 mix with distilled water (consult manual for specific type/color). Brake Fluid: DOT 3. Transmission Fluid: Manual - GL-4 gear oil, SAE 75W-90. Automatic - ATF SP-III (or equivalent DEXRON/MERCON, check manual). Power Steering Fluid: ATF Dexron II (or equivalent). Differential Fluid: SAE 80W-90 GL-5.

Known Issues:

Rust and corrosion, particularly on frame rails, cab corners, and bed. Clutch wear (manual transmission). Radiator leaks or failure. Heater core leaks. Suspension wear (ball joints, tie rods). Ignition system components (e.g., ignition coil, distributor) can become problematic with age. Timing belt failure on the 2.4L engine if not replaced at recommended intervals (interference engine). AC system leaks or compressor issues.

Engine Oil Capacity:

Approximately 4.5 - 5.5 quarts with filter. (Refer to manual for exact specification and oil type).

Transmission Fluid Capacity Manual:

Approximately 2.0 - 2.5 quarts. (Refer to manual for exact specification).

Transmission Fluid Capacity Automatic:

Approximately 7-9 quarts for a complete fluid change, including torque converter. (Refer to manual for exact specification).

Differential Fluid Capacity:

Approximately 1.5 - 2.0 quarts for rear differential. (Refer to manual for exact specification).

Timing Belt Part Number:

Timing belt part numbers vary by manufacturer (e.g., Gates, Dayco). A common replacement belt for the Mitsubishi 4G64 engine is often identified by part numbers like Gates TB253 or similar. The manual will provide the OEM part number or cross-references.

Spark Plug Gap:

Typically around 0.039 - 0.043 inches (1.0 - 1.1 mm) for the 2.4L engine. Consult manual for specific spark plug type and gap.

Idle Speed:

Approximate idle speed for a warmed-up engine: 750-850 RPM in Park/Neutral. (Refer to manual for specific specifications and adjustments).

📚 Vehicle History

Brand Heritage:

The Dodge Ram 50 (and its Plymouth Arrow counterpart) represented Chrysler's entry into the compact pickup truck market. These were rebadged Mitsubishi vehicles, a strategic partnership that allowed Chrysler to offer competitive products without extensive in-house development.

Model Evolution:

The Ram 50 was based on the Mitsubishi Forte/Fronte, which evolved into the Mighty Max. The 1990 model represents the second generation of this platform, which saw styling updates and powertrain enhancements compared to the first generation (1979-1986). This generation (1987-1996) featured a more aerodynamic design and the introduction of the more powerful 2.4L engine.

Production:

Produced from 1979 through 1996. The 1990 model was manufactured by Mitsubishi in Japan and sold under the Dodge and Plymouth brands in North America.

🏆 Awards & Recognition

Recognitions:

The Dodge Ram 50, as a rebadged Mitsubishi product, would not typically have independent awards attributed directly to the Dodge nameplate in the same way as vehicles developed solely by Chrysler. However, the underlying Mitsubishi platform often received positive reviews for its value, reliability, and utility within the compact pickup segment of its time.

Ratings:

Consumer satisfaction ratings for vehicles of this era and type were generally moderate. Focus was on utility and affordability rather than luxury or advanced features.

Certifications:

Vehicles met all applicable US federal motor vehicle safety standards (FMVSS) in effect for 1990. Emissions compliance would vary by state and model year.