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Jeep Wrangler 1987-1995 Drivetrain Specifications
Explore the detailed drivetrain specifications for the 1987-1995 Jeep Wrangler. Learn about transmission, transfer case, axle, and differential configurations to enhance performance, maintenance, and repairs.
Overview Specifications
This document provides detailed specifications and information about the drivetrain of the 1987-1995 Jeep Wrangler. It includes sections on the engine, transmission, transfer case, and axle configurations. Use this guide to understand the technical components of the Wrangler's drivetrain, locate specific information, and compare different model years. The 'How To' section explains how to search and navigate the document effectively.
How to Use
Use the search functionality to find specific terms or components within the document. Enter keywords like 'engine', 'transmission', or 'axle' to quickly locate relevant sections.
Navigate through the document using the section titles and subsections. Click on a section to expand it and view detailed information. Use the 'Quick Reference' table for key specifications.
Key Specifications
Engine Power
117-190 hp
Transmission Options
5-speed manual or 4-speed automatic
Transfer Case Gear Ratio
2.72:1 or 4.0:1
Front Axle
Dana 30
Rear Axle
Dana 35 or AMC 20
Available Specifications
Engine Specifications
This section covers the engine options available for the 1987-1995 Jeep Wrangler, including details on displacement, horsepower, torque, and fuel delivery systems. It also provides information on engine codes and configurations.
Engine Specifications
This section covers the engine options available for the 1987-1995 Jeep Wrangler, including details on displacement, horsepower, torque, and fuel delivery systems. It also provides information on engine codes and configurations.
Engine Options
- 2.5L AMC 150 inline-4 engine
- 4.2L AMC 258 inline-6 engine (1987-1990)
- 4.0L AMC 242 inline-6 engine (1991-1995)
- Carbureted fuel system (1987-1990)
- Multi-port fuel injection (1991-1995)
- Horsepower ranges from 117 hp to 190 hp
Engine Codes
- AMC 150: 2.5L inline-4
- AMC 258: 4.2L inline-6
- AMC 242: 4.0L inline-6
- Renix fuel injection system (1987-1990)
- Chrysler fuel injection system (1991-1995)
Transmission Options
This section details the manual and automatic transmission options available for the Jeep Wrangler during this period. It includes information on gear ratios, torque capacity, and compatibility with different engines.
Transmission Options
This section details the manual and automatic transmission options available for the Jeep Wrangler during this period. It includes information on gear ratios, torque capacity, and compatibility with different engines.
Manual Transmissions
- AX-5 5-speed manual (4-cylinder models)
- AX-15 5-speed manual (6-cylinder models)
- BA-10 5-speed manual (early 6-cylinder models)
- Gear ratios range from 3.83:1 to 0.79:1
- Torque capacity up to 260 lb-ft
Automatic Transmissions
- TF904 3-speed automatic (early models)
- AW4 4-speed automatic (1991-1995)
- Gear ratios range from 2.80:1 to 0.70:1
- Torque capacity up to 300 lb-ft
Transfer Case
This section provides information on the transfer case configurations used in the Jeep Wrangler, including part-time and full-time 4WD systems. It covers gear ratios and compatibility with different transmissions.
Transfer Case
This section provides information on the transfer case configurations used in the Jeep Wrangler, including part-time and full-time 4WD systems. It covers gear ratios and compatibility with different transmissions.
Transfer Case Models
- NP207 part-time 4WD (1987-1990)
- NP231 part-time 4WD (1991-1995)
- NP242 full-time 4WD (optional on 1991-1995 models)
- Low-range gear ratio of 2.72:1 (NP207, NP231)
- Low-range gear ratio of 2.72:1 or 4.0:1 (NP242)
Axle Configurations
This section details the front and rear axle configurations used in the Jeep Wrangler, including gear ratios, axle codes, and differential types. It also covers optional locking differentials.
Axle Configurations
This section details the front and rear axle configurations used in the Jeep Wrangler, including gear ratios, axle codes, and differential types. It also covers optional locking differentials.
Front Axle
- Dana 30 front axle (all models)
- Standard gear ratio of 3.07:1 or 3.55:1
- Open differential (standard)
- Optional Trac-Lok limited-slip differential
Rear Axle
- Dana 35 rear axle (most models)
- AMC 20 rear axle (optional on early models)
- Standard gear ratio of 3.07:1 or 3.55:1
- Open differential (standard)
- Optional Trac-Lok limited-slip differential
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Component Specifications
Overview
- Type
- 4x4 part-time
- Configuration
- Front engine, rear-wheel drive with selectable 4WD
- Platform
- Jeep YJ
- Material
- Steel and aluminum
- Location
- Front and rear axles, transfer case
Dimensions
- Transfer Case Length
- 12.5 inches (31.75 cm)
- Transfer Case Width
- 8.75 inches (22.22 cm)
- Transfer Case Height
- 9.25 inches (23.5 cm)
- Axle Tube Diameter
- 2.5 inches (6.35 cm)
- Axle Length Front
- 54.5 inches (138.43 cm)
- Axle Length Rear
- 56.25 inches (142.87 cm)
- Driveshaft Length Front
- 31.25 inches (79.37 cm)
- Driveshaft Length Rear
- 35.5 inches (90.17 cm)
Materials
- Transfer Case
- Aluminum housing with steel gears
- Axle Housing
- Steel
- Driveshaft
- Steel tube with U-joints
- Differential
- Cast iron housing with steel gears
Features
- Transfer Case
-
- Part-time 4WD
- 2.72:1 low-range gearing
- Manual shift lever
- Chain-driven
- Axles
-
- Dana 30 front axle
- Dana 35 rear axle
- Open differentials
- Optional limited-slip differential
- Driveshafts
-
- Two-piece rear driveshaft
- Single-piece front driveshaft
- U-joints for articulation
- Suspension
-
- Leaf spring suspension
- Solid front and rear axles
- High ground clearance
Safety Features
- Transfer Case
-
- Mechanical shift lock
- Neutral safety switch
- Driveshafts
-
- U-joint shields
- Balanced shafts
Comfort Features
- Transfer Case
-
- Smooth shifting mechanism
- Reduced vibration
- Axles
-
- Quiet operation
- Reduced gear whine
Accessories
- Transfer Case
-
- Skid plate
- Shift lever boot
- Shift linkage kit
- Axles
-
- Diff covers
- Axle seals
- Bearing kits
- Driveshafts
-
- U-joint grease fittings
- Balancing weights
- Protective coatings
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Check transfer case fluid
- Inspect driveshaft U-joints
- Lubricate axle bearings
- Check axle seals
- Inspect differential fluid
- Maintenance Notes
- Use GL-5 gear oil for differentials and transfer case
Warranty
- Basic Warranty
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain Warranty
- Miles: 60,000Years: 5Coverage: Drivetrain components
- Corrosion Warranty
- Miles: 100,000Years: 7Coverage: Perforation only
- Warranty Terms
- Transferable to subsequent owners
Production Details
- Manufacturer
- Chrysler Corporation
- Manufacturing Process
-
- Casting for axle housings
- Machining for gears
- Assembly line production
- Quality Control
- Testing: Dyno testing for transfer casesinspection: Visual and dimensional checksStandards: ISO 9001 compliance
- Sustainability Practices
-
- Recycled steel usage
- Waste reduction initiatives
- Production Metrics
- Units Per Year: Approximately 100,000Lead Time: 6 weeks
Service Information for drivetrain Service
Maintenance and service requirements specific to this component
- Inspect transfer case fluid level
- Check driveshaft U-joints for wear
- Lubricate axle bearings
- Inspect differential seals
- Check axle fluid levels
Use manufacturer-recommended fluids
- Replace transfer case fluid
- Inspect and replace worn U-joints
- Check axle alignment
- Inspect differential gears
- Test 4WD engagement
Special tools may be required for U-joint replacement
- Rebuild or replace transfer case if necessary
- Inspect and replace axle bearings
- Check driveshaft balancing
- Replace differential fluid
- Inspect and replace axle seals
Consider professional service for transfer case rebuild
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What drivetrain components are compatible with the 1987-1995 Jeep Wrangler?
What drivetrain components are compatible with the 1987-1995 Jeep Wrangler?
The 1987-1995 Jeep Wrangler (YJ) typically features a part-time 4WD system with options for the Command-Trac or Selec-Trac transfer cases. It is compatible with Dana 30 front and Dana 35 rear axles, though some models may have the AMC 20 rear axle. The transmission options include the AX-5 (4-cylinder models) and AX-15 (6-cylinder models). Always verify compatibility with your specific model year and configuration.
Q2 What are the maintenance requirements for the Jeep Wrangler drivetrain?
What are the maintenance requirements for the Jeep Wrangler drivetrain?
Regular maintenance includes checking and replacing transfer case and differential fluids every 30,000 miles or as per the manual. Inspect U-joints and CV joints for wear and replace as needed. Ensure proper lubrication of drivetrain components and check for leaks. Regularly inspect the driveshaft and axles for damage or excessive play. Follow the manufacturer’s guidelines for optimal performance.
Q3 How do I replace the transfer case in my 1987-1995 Jeep Wrangler?
How do I replace the transfer case in my 1987-1995 Jeep Wrangler?
To replace the transfer case, first, disconnect the negative battery cable. Remove the driveshafts, skid plate, and shift linkage. Support the transmission and transfer case with a jack. Unbolt the transfer case from the transmission and carefully lower it. Install the new transfer case by reversing the steps, ensuring proper alignment and torque specifications. Refill with the recommended fluid.
Q4 What are common drivetrain issues and how can I troubleshoot them?
What are common drivetrain issues and how can I troubleshoot them?
Common issues include vibrations (check driveshaft balance and U-joints), grinding noises (inspect transfer case and differential gears), and fluid leaks (check seals and gaskets). For 4WD engagement problems, verify the shift linkage and vacuum lines. Use a diagnostic scan tool for electronic issues. Always refer to the service manual for specific troubleshooting steps.
Q5 How can I optimize the drivetrain performance of my Jeep Wrangler?
How can I optimize the drivetrain performance of my Jeep Wrangler?
Upgrade to high-performance U-joints and CV axles for durability. Use synthetic fluids for better lubrication and temperature resistance. Ensure proper gear ratios for your tire size. Regularly inspect and maintain drivetrain components. Consider adding a slip yoke eliminator (SYE) for lifted vehicles to reduce driveline vibrations. Always follow manufacturer recommendations for upgrades.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Jeep Wrangler YJ Service Manual
Coming SoonComprehensive manual covering drivetrain, engine, and electrical systems for 1987-1995 Jeep Wrangler models.
Technical Service Bulletin: Drivetrain Vibrations
Coming SoonBulletin addressing common drivetrain vibration issues in 1987-1995 Jeep Wrangler models and recommended fixes.
Jeep Wrangler Drivetrain Parts Catalog
Coming SoonCatalog listing OEM and aftermarket drivetrain components for 1987-1995 Jeep Wrangler models.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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