🏷️ Basic Information

Make:

Dodge

Model:

Ram Truck

Chassis Code:

AD (Third Generation Ram Truck)

Model Variant:

AD100, AD150

Production Years Covered:

1989, 1990, 1991

👋 Introduction

Positioning:

This manual targets owners and independent repair shops seeking to maintain, diagnose, and repair their Dodge Ram AD series trucks. It represents a vital resource for preserving the longevity and performance of these robust vehicles.

Value Proposition:

Compared to a factory service manual, this digital offering provides convenient access and often includes additional troubleshooting tips or a more organized structure. It is indispensable for DIY mechanics and professionals alike who need accurate, detailed procedures.

Completeness:

Comprehensive coverage across all major mechanical and electrical systems, ensuring no critical repair procedure is omitted.

Diagnostic Focus:

Emphasis on diagnostic trouble codes (DTCs), symptom-based troubleshooting, and detailed wiring schematics for accurate fault identification.

Accessibility:

Digital format allows for easy searching, printing of specific sections, and accessibility on multiple devices.

📋 Manual Details

Primary Coverage:

Complete Workshop Service and Repair

Estimated Page Count:

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

Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable (PDF)

📖 Manual Coverage

Powertrain:

Engine mechanical, engine performance, fuel system, ignition system, exhaust system, cooling system, lubrication system, engine control systems (ECM/PCM)

Drivetrain:

Manual transmission, automatic transmission, transfer case (4WD models), driveshafts, differentials, axles, clutch system

Chassis And Suspension:

Front suspension, rear suspension, steering system, power steering, brakes (front and rear), anti-lock braking system (ABS) if equipped

Electrical And Body:

Chassis electrical systems, wiring diagrams, lighting, instruments and indicators, heating, ventilation, and air conditioning (HVAC), body panels, doors, windows, seats, bumpers, diagnostic trouble codes (DTCs)

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, lubrication, tune-ups

Repair And Rebuild:

Engine overhaul, transmission rebuilds, suspension component replacement, brake caliper/rotor replacement, electrical component diagnostics and repair, bodywork repair

Diagnostics And Troubleshooting:

Step-by-step diagnostic procedures for common and uncommon faults, symptom-based troubleshooting guides, electrical troubleshooting using wiring diagrams

Technical Specifications:

Torque specifications, clearances, fluid capacities, electrical component data, engine timing, emissions data

Depth:

Comprehensive, covering everything from basic maintenance to complete component rebuilds and advanced diagnostics, including detailed troubleshooting trees and wiring diagrams.

📊 Manual Specifications

File Type:

PDF

Quality:

High-resolution scans or digitally created content, suitable for printing clear, legible pages.

Binding:

N/A (Downloadable Digital Format)

Paper:

N/A (Downloadable Digital Format)

Text Search:

Likely searchable text within the PDF for quick information retrieval.

Visual Aid Quality:

Includes detailed diagrams, exploded views, and schematics crucial for repair and diagnostics.

⚙️ Engine Specifications

Engine Options:

Likely covers the 3.9L V6 Magnum, 5.2L V8 Magnum, and potentially the 5.9L V8 Magnum engines. The specific availability depends on the AD100/AD150 designation and market.

3.9L V6 Magnum Horsepower:

Approximately 173 hp @ 4800 rpm (1990 models)

3.9L V6 Magnum Torque:

Approximately 210 lb-ft @ 2800 rpm (1990 models)

5.2L V8 Magnum Horsepower:

Approximately 170 hp @ 4000 rpm (1990 models), later models around 190-230 hp depending on year/tune.

5.2L V8 Magnum Torque:

Approximately 275 lb-ft @ 2400 rpm (1990 models), later models around 290-330 lb-ft depending on year/tune.

5.9L V8 Magnum Horsepower:

Typically around 190-230 hp, torque around 330-360 lb-ft (depending on year and specific configuration).

Fuel Delivery:

Fuel Injection (MPI - Multi-Point Injection) for all Magnum engines during this period.

Ignition System:

Distributorless Ignition System (DIS) or distributor-based electronic ignition systems, depending on the specific year and engine variant.

Emission Controls:

Catalytic converters, oxygen sensors (O2 sensors), EGR (Exhaust Gas Recirculation) system.

🔧 Transmission

Manual Transmission:

Likely available with manual transmissions such as the A500/A518 (4-speed overdrive automatic), NP435 (4-speed manual), Getrag G360 (5-speed manual) for specific configurations.

Automatic Transmission:

Commonly offered with automatic transmissions like the A500/A518 (4-speed overdrive automatic).

Transfer Case:

Manual or electronic shift transfer case for 4WD models.

Automatic Transmission Fluid:

Chrysler ATF+3 or equivalent (e.g., Dexron III, Mercon - check specific manual section for precise recommendations for the era).

Manual Transmission Fluid:

API GL-5, SAE 75W-90 or SAE 80W-90 gear oil (specific to transmission model, e.g., Getrag or NP series).

📐 Dimensions

Wheelbase Options:

Multiple wheelbase options were available, typically including short bed (approx. 112-115 inches) and long bed (approx. 125-135 inches) configurations.

Body Styles:

Regular Cab, Club Cab (extended cab) configurations were standard. Pickup bed lengths varied accordingly.

Gross Vehicle Weight Rating Gvw:

GVWR varied significantly by configuration, often ranging from 5,000 lbs to 7,500 lbs or higher for heavier duty variants.

Curb Weight:

Curb weight would typically range from 3,800 lbs to 4,800 lbs depending on engine, drivetrain, and options.

🛡️ Safety Features

Crash Test Data:

As this is a 1989-1991 model, NHTSA and IIHS ratings might be less comprehensive than modern standards. The manual will likely detail safety equipment and passive restraint systems of the era.

Braking System:

Front disc brakes (standard), rear drum brakes. Available ABS (Anti-lock Braking System) on some models.

Restraint System:

Seat belts (lap and shoulder belts for front occupants). Some models might have featured airbags, though less common in base configurations for these years.

Lighting:

Halogen headlights, standard taillamps, turn signals, and brake lights. Manual will cover aiming and bulb replacement.

💡 Technology Features

Audio System:

Factory-installed AM/FM radio with cassette player was common. Optional CD players might have been available on higher trims. Speaker systems typically basic.

Cruise Control:

Electronic cruise control was an optional feature available on many models.

Anti Lock Braking System ABS:

ABS was an option, typically on rear-wheel anti-lock (RWAL) systems or a more comprehensive four-wheel system depending on year and trim.

Diagnostics Port:

OBD-I (On-Board Diagnostics I) port, typically located under the dash or in the engine bay, used for retrieving diagnostic trouble codes.

HVAC System:

Manual or automatic temperature control HVAC systems, featuring A/C and heater. Manual covers operation, maintenance, and troubleshooting of the blower motor, compressor, and refrigerant system.

🔧 Maintenance

Oil Change Interval:

Typically every 3,000 to 5,000 miles or 3 to 6 months, depending on driving conditions and oil type. Manual will provide exact recommendations.

Tire Rotation:

Recommended every 6,000 to 8,000 miles or as part of oil change service.

Transmission Fluid Change:

Automatic transmission fluid typically recommended every 30,000 to 60,000 miles. Manual transmission fluid inspection/change less frequent, often 60,000-100,000 miles.

Engine Oil Type:

SAE 10W-30 or SAE 10W-40 API SG or higher rated oil is common for these engines. Consult manual for precise viscosity and API classification.

Coolant Type:

Ethylene Glycol based coolant (green type) with a 50/50 mix of coolant and distilled water for freeze protection and corrosion inhibition. Specification may be Chrysler MS-7170 or similar.

Brake Fluid Type:

DOT 3 brake fluid.

Power Steering Fluid:

Chrysler power steering fluid or ATF+3.

Common Wear Items:

Ball joints, tie rod ends, sway bar links, U-joints, exhaust manifold cracks (especially on V8s), intake manifold gaskets, fuel pump issues.

Engine Specific Issues:

Potential for distributor/rotor wear, oil pan gasket leaks, head gasket leaks on high-mileage V8s. Magnum engines generally robust but require proper maintenance.

Transmission Issues:

Torque converter shudder (automatics), clutch wear (manuals), potential for worn synchros (Getrag 5-speed manual).

📚 Vehicle History

Dodge Truck Legacy:

Dodge has a long history of producing robust and capable trucks, dating back to the early 20th century. The 'Ram' nameplate has become synonymous with American utility and power.

Third Generation Ram:

The AD series represents the third generation of Dodge Ram trucks, introduced in 1972. This generation, particularly with the 'Magnum' engine introductions and design refinements, was a significant step forward in performance and styling. The 1989-1993 models were part of this generation's later facelift and modernization.

Manufacturing Locations:

Primarily produced in the United States, with manufacturing facilities such as Warren Truck Assembly Plant in Michigan being a key location.

Sales Performance:

The Dodge Ram truck line was a strong competitor in the light-duty pickup market during this era, known for its distinctive styling and powerful V8 engine options.

🏆 Awards & Recognition

Truck Of The Year:

While specific model year awards for the AD series might not be readily available in a single summary, Dodge trucks during this era were generally well-regarded for their engineering and capability. For instance, Dodge trucks often featured in 'Best Buy' lists from automotive publications of the time.