🏷️ Basic Information

Make:

Dodge

Model:

Ram Truck

Year:

1990

Chassis Code:

AN

Generation:

Second Generation (1994-2001) - *Note: This manual covers the 1990 model, which is the final year of the first generation before the significant redesign.*

👋 Introduction

Market Position:

The 1990 Dodge Ram Truck represented the culmination of Dodge's first-generation full-size pickup truck line, known for its robust construction and capability. It was a strong contender in the competitive full-size pickup market, appealing to buyers seeking utility, towing capacity, and a no-nonsense workhorse.

Competitive Analysis:

Competed directly with Ford F-Series and Chevrolet C/K series trucks. The Ram often distinguished itself with its bold styling and powerful engine options.

Key Features:

Durable body-on-frame construction, powerful V8 engine options, available 4x4 drivetrain, spacious cab options (regular and club cab), significant towing and payload capabilities.

Interior Design:

Functional and durable interior, with robust materials. Ergonomics focused on utility and ease of use for a working vehicle.

📋 Manual Details

Coverage Areas:

All Models/Engines/Trim/Transmissions

Trim Levels Covered:

Base, SLT, Sport, and potentially others depending on specific model year configurations.

Chassis Configurations:

2WD and 4WD models, various cab and bed configurations (standard cab, club cab, long bed, short bed).

Page Count:

Likely over 1000 pages (typical for comprehensive workshop manuals of this era).

Manual Type:

Workshop Repair Service Manual

Manual Purpose:

Designed for diagnosing, repairing, maintaining, and troubleshooting the 1990 Dodge Ram Truck, covering all aspects of the vehicle's mechanical and electrical systems.

Language:

English

Format:

PDF Download

📖 Manual Coverage

Systems Covered:

Engine mechanical and electrical, fuel system, cooling system, lubrication system, exhaust system, manual transmission, automatic transmission, transfer case, drive shafts, differentials, steering, suspension (front and rear), brakes (front disc, rear drum/disc), wheels and tires, body and frame, interior systems, heating, ventilation, and air conditioning (HVAC), electrical system (wiring diagrams, components, diagnostics), lighting, instrumentation, emissions control systems.

Electrical Systems:

Detailed wiring diagrams for all circuits, including engine, lighting, charging system, starting system, instruments, HVAC, power accessories, and diagnostic connectors. Troubleshooting procedures for electrical faults.

Body And Frame:

Body panel removal and installation, door mechanisms, glass replacement, frame inspection and repair, underbody coatings, and corrosion prevention.

Instrumentation And Gauges:

Troubleshooting and repair of the instrument cluster, speedometer, tachometer, fuel gauge, temperature gauge, oil pressure gauge, and warning lights.

Procedures Included:

Routine maintenance, scheduled maintenance, disassembly and assembly of all major components, diagnostic procedures for common issues, troubleshooting guides, repair procedures for specific components, electrical system diagnostics and repair, body repair, HVAC system service, specifications for torque, clearances, and adjustments, wiring diagrams, component locations, exploded views.

Engine Overhaul Procedures:

Step-by-step instructions for engine disassembly, inspection, measurement, and reassembly of core components like pistons, rings, bearings, crankshaft, camshaft, cylinder heads, and valve train.

Brake System Repair:

Detailed procedures for replacing brake pads, rotors, drums, shoes, wheel cylinders, master cylinder, and bleeding the brake system.

Suspension Steering Repair:

Service procedures for ball joints, tie rods, control arms, shock absorbers, steering gear, and alignment specifications.

Air Conditioning Service:

Procedures for refrigerant charging, leak detection, component replacement (compressor, condenser, evaporator), and system diagnostics.

Technical Depth:

Comprehensive, suitable for professional technicians and advanced DIY mechanics. Covers everything from basic fluid changes to complete engine and transmission overhauls, as well as in-depth electrical diagnostics.

Diagnostic Troubleshooting:

Includes detailed symptom-based troubleshooting charts for mechanical, electrical, and fuel system issues, guiding the user through systematic diagnostic steps.

Torque Specifications:

Extensive list of torque specifications for all critical fasteners, including engine components, chassis fasteners, suspension, and body panels.

Emissions Control:

Details on catalytic converters, O2 sensors, EGR systems, and EVAP systems, including diagnostic procedures and component testing.

📊 Manual Specifications

File Format:

PDF

Searchability:

PDF format allows for keyword searching, significantly aiding in locating specific information quickly.

Print Quality:

High-resolution scans, ensuring clarity of text and diagrams.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine:

5.2L (318 ci) Magnum V8

Engine Options:

5.2L (318 ci) V8, 5.9L (360 ci) V8, 3.9L (239 ci) V6 (less common in heavy-duty models)

5.2L V8 Horsepower:

Approx. 170-175 hp

5.2L V8 Torque:

Approx. 250-260 lb-ft

5.9L V8 Horsepower:

Approx. 190-200 hp

5.9L V8 Torque:

Approx. 300-320 lb-ft

Fuel System:

Multi-point fuel injection (MPI) for Magnum engines.

Engine Management:

Chrysler's Small Block Magnum engine series, known for its robustness and power.

Engine Code 5 2L:

Often designated by VIN digit 'Y' for the 5.2L V8.

Engine Code 5 9L:

Often designated by VIN digit 'Z' for the 5.9L V8.

Engine Code 3 9L:

Often designated by VIN digit 'U' for the 3.9L V6.

Valve Train Type:

Overhead Valve (OHV) pushrod design for all V6 and V8 Magnum engines.

Timing Drive:

Timing chain and sprockets.

Engine Block Material:

Cast Iron

Cylinder Head Material:

Cast Iron

🔧 Transmission

Standard Transmission:

5-speed manual (NV3500 or similar)

Optional Transmission:

3-speed automatic (A727/TorqueFlite) or 4-speed automatic (A518 overdrive)

Transmission Features:

Overdrive gear in A518 automatic for improved highway fuel economy. Heavy-duty transmissions available for towing applications.

Transfer Case Options:

Part-time 4x4 transfer case (e.g., NP241).

📐 Dimensions

Wheelbase Options:

Various wheelbases depending on configuration (e.g., standard bed, long bed, chassis cab).

Body Styles:

Regular Cab, Club Cab (extended cab)

Bed Lengths:

Approximately 6.5 ft and 8 ft (standard and long bed options).

Gvwr Range:

Ranges significantly based on configuration, from light-duty to heavy-duty models (e.g., 5,200 lbs to 8,500+ lbs).

🛡️ Safety Features

Safety Ratings:

N/A (Pre-date modern standardized crash testing like NHTSA/IIHS ratings).

Active Features:

Power-assisted front disc brakes, rear drum brakes (or optional rear discs on some models). Power steering.

Passive Features:

Lap belts. Shoulder belts may be present but were often lap-and-shoulder combinations.

💡 Technology Features

Infotainment System:

Basic AM/FM radio, optional cassette player, optional CD player. Analog gauges and controls.

Driver Assistance Features:

None by modern standards. ABS was becoming more common but might have been optional or standard on higher trims/specific models.

Connectivity:

No integrated connectivity features like Bluetooth or USB.

🔧 Maintenance

Oil Change Interval:

Typically 3,000 miles or 3 months (common for the era). Consult manual for specific recommendations based on oil type and driving conditions.

Transmission Fluid Change:

Every 30,000-60,000 miles for automatic transmissions, or as specified in the manual.

Spark Plug Replacement:

Typically every 30,000 miles, though specific recommendations vary by spark plug type (e.g., copper, platinum). Consult manual for exact interval and plug type.

Engine Coolant Flush:

Every 30,000-50,000 miles or 2-3 years.

Engine Oil Spec:

API SG or SH service category. Viscosity: 10W-30 or 5W-30 recommended for colder climates. Check manual for precise specifications.

Coolant Spec:

Ethylene glycol based antifreeze. A 50/50 mixture with distilled water is standard. Check manual for specific Mopar coolant type if applicable.

Transmission Fluid Automatic:

ATF+3 or ATF+4 (though ATF+3 was more common for 1990, consult manual for exact specification, likely Dexron II/III equivalent or Mopar ATF+3).

Transmission Fluid Manual:

GL-3 or GL-4 gear oil, typically 75W-90 or 80W-90. Consult manual for exact specification.

Brake Fluid Spec:

DOT 3 brake fluid.

Power Steering Fluid:

ATF+3 or Mopar power steering fluid (often equivalent to Dexron/Mercon).

Differential Fluid:

API GL-5, 75W-90 or 80W-90 gear oil. Limited slip differentials may require a friction modifier additive.

Known Issues:

Common issues include potential rear main seal leaks, intake manifold gasket leaks on V8 engines, rust in common areas (fenders, rocker panels), HVAC blower motor issues, and potential for radiator leaks. The Magnum engines are generally reliable but can be prone to valve cover gasket leaks.

Oil Filter Part Number:

Typical Mopar part number or equivalent from FRAM (e.g., PH5050), Wix, or Purolator. Consult manual or parts catalog for exact numbers.

Air Filter Part Number:

Typical Mopar part number or equivalent from FRAM (e.g., CA3177), Wix, or Purolator. Consult manual or parts catalog for exact numbers.

📚 Vehicle History

Brand Heritage:

Dodge has a long history of producing durable and capable trucks, dating back to the early 20th century. The Ram nameplate was introduced in 1981 and quickly became synonymous with ruggedness.

Dodge Truck Legacy:

Dodge trucks have a reputation for toughness and capability, a heritage that the 1990 Ram embodies. This era was characterized by robust V8 engines and a focus on payload and towing.

Model Evolution:

The 1990 model is the final iteration of the first-generation Ram (1972-1993). This generation was known for its squared-off styling and solid mechanicals. It would be significantly redesigned for the second generation in 1994.

Design Philosophy:

The first-generation Ram truck (including 1990) emphasized a strong, utilitarian design with a focus on mechanical durability and performance, setting the stage for future iterations.

Production Years:

First Generation: 1972-1993. 1990 is part of the later years of this generation.

🏆 Awards & Recognition

Recognitions:

While specific awards for the 1990 model year are not widely documented, the Dodge Ram line consistently received praise for its towing and hauling capabilities during its tenure.