Infiniti G20 1999-2002 4R01 Transmission Specifications
This document provides detailed technical specifications for the 4R01 transmission used in the 1999-2002 Infiniti G20. It includes gear ratios, torque capacity, fluid requirements, and maintenance intervals. These specifications are essential for mechanics, enthusiasts, and owners looking to understand the transmission's performance, ensure proper maintenance, or plan upgrades. The data is sourced from factory service manuals and technical bulletins, ensuring accuracy and reliability. Whether you're diagnosing issues, performing repairs, or optimizing performance, this resource offers valuable insights into the 4R01 transmission's design and operation.
Overview Specifications
This document provides detailed specifications and technical information about the 4R01 transmission used in the 1999-2002 Infiniti G20. It is designed to assist technicians, enthusiasts, and owners in understanding the transmission's design, operation, and maintenance. Use this guide to locate specific details, troubleshoot issues, or perform repairs. The document is organized into sections for easy navigation and includes a quick reference table for key specifications.
How to Use
Use the search function to quickly locate specific terms or topics within the document. Enter keywords related to the 4R01 transmission, such as 'gear ratios' or 'fluid capacity,' to find relevant sections.
Navigate through the document using the table of contents or section headings. Each major section is divided into subsections with detailed technical points for easy reference.
Key Specifications
Transmission Type
4-speed automatic
Gear Ratios
2.785:1 to 0.694:1
Fluid Capacity
7.4 quarts
Final Drive Ratio
4.083:1
Weight
Approx. 150 lbs
Available Specifications
Transmission Design
This section covers the design and construction of the 4R01 transmission, including its layout, components, and materials. Learn about the transmission's architecture and how it integrates with the Infiniti G20's drivetrain.
Transmission Design
This section covers the design and construction of the 4R01 transmission, including its layout, components, and materials. Learn about the transmission's architecture and how it integrates with the Infiniti G20's drivetrain.
Gear Configuration
- 4-speed automatic transmission
- Front-wheel drive configuration
- Planetary gearset design
- Hydraulic control system
- Torque converter with lock-up clutch
- Compact and lightweight construction
Materials and Durability
- High-strength alloy gears
- Durable clutch plates
- Corrosion-resistant housing
- Sealed bearings for longevity
- Heat-treated components
- Optimized for smooth shifting
Performance Specifications
Explore the performance characteristics of the 4R01 transmission, including gear ratios, shift points, and torque handling. This section provides insights into how the transmission enhances the driving experience.
Performance Specifications
Explore the performance characteristics of the 4R01 transmission, including gear ratios, shift points, and torque handling. This section provides insights into how the transmission enhances the driving experience.
Gear Ratios
- 1st gear: 2.785:1
- 2nd gear: 1.545:1
- 3rd gear: 1.000:1
- 4th gear: 0.694:1
- Reverse gear: 2.272:1
- Final drive ratio: 4.083:1
Shift Characteristics
- Smooth and responsive shifts
- Adaptive shift logic
- Optimized for fuel efficiency
- Sport mode for quicker shifts
- Manual shift capability
- Low noise and vibration
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4R01 transmission. Learn about fluid requirements, inspection intervals, and common troubleshooting tips.
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4R01 transmission. Learn about fluid requirements, inspection intervals, and common troubleshooting tips.
Fluid Specifications
- Recommended fluid: Nissan Matic-D
- Fluid capacity: 7.4 quarts (7.0 liters)
- Fluid change interval: 60,000 miles
- Use of synthetic fluid recommended
- Check fluid level when warm
- Avoid overfilling
Common Issues
- Delayed shifting
- Transmission fluid leaks
- Slipping gears
- Check engine light due to transmission codes
- Worn clutch plates
- Faulty solenoid valves
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Transmission Specifications
Overview
- Type
- Automatic Transmission
- Configuration
- 4-speed
- Platform
- FF-L platform
- Material
- Aluminum alloy casing
- Location
- Front-wheel drive
Dimensions
- Length
- 28.5 inches (724 mm)
- Width
- 22.8 inches (579 mm)
- Height
- 18.3 inches (465 mm)
- Weight
- 145 lbs (65.8 kg)
- input Shaft Diameter
- 1.2 inches (30.5 mm)
- Output Shaft Diameter
- 1.1 inches (28 mm)
- Fluid Capacity
- 7.4 quarts (7 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Nitrile rubber
Features
- Performance
-
- Smooth shifting
- Adaptive shift control
- Lock-up torque converter
- Efficiency
-
- Optimized gear ratios
- Reduced internal friction
- Efficient fluid circulation
- Durability
-
- Reinforced gear teeth
- High-temperature seals
- Robust clutch materials
- Control
-
- Electronic shift control
- Manual shift mode
- Grade logic control
- integration
-
- Compatible with SR20DE engine
- Integrated cooling system
- Direct ECU communication
Safety Features
- Fail Safe
-
- Limp-home mode
- Overheat protection
- Mechanical
-
- Shear pin protection
- Overload protection
Comfort Features
- Noise Reduction
-
- Precision gear meshing
- Vibration dampening
- Smoothness
-
- Adaptive shift logic
- Torque converter lock-up
- Convenience
-
- Automatic mode
- Manual override
Accessories
- Cooling
-
- Transmission cooler lines
- Integrated radiator cooler
- Auxiliary cooler
- Mounting
-
- Transmission mount
- Crossmember
- Bracket kit
- Electronics
-
- Shift solenoid kit
- Speed sensor
- Transmission control module
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Shift solenoid check
- Torque converter inspection
- Mount and bracket inspection
- Maintenance Notes
- Use only Nissan Matic-D or equivalent ATF
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: UnlimitedYears: 7Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Federal emissions components
Production Details
- Manufacturer
- JATCO
- Manufacturing Process
-
- Precision CNC machining
- Heat treatment
- Automated assembly
- Quality Control
- Testing: Durability testing, Shift performance testing, Leak testingStandards: ISO 9001, JIS D 2001
- Sustainability
-
- Recyclable materials
- Energy-efficient manufacturing
- Waste reduction programs
- Production Metrics
- Units Per Year: 150,000Defect Rate: 0.05%Lead Time: 6 weeks
Service Information for 4r01 transmission Service
Maintenance and service requirements specific to this component
- Replace transmission fluid
- Inspect seals and gaskets
- Check shift solenoids
- Inspect torque converter
- Test transmission control module
Use only recommended ATF for optimal performance
- Replace transmission filter
- Inspect clutch packs
- Check fluid lines for leaks
- Test shift performance
- Inspect mounts and brackets
Ensure proper torque on all fasteners during reassembly
- Replace shift solenoids
- Inspect and replace worn seals
- Check gear wear
- Test lock-up torque converter
- Perform full system diagnostic
Major service may require specialized tools and equipment
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4r01 transmission compatible with other Infiniti models?
Is the 4r01 transmission compatible with other Infiniti models?
The 4r01 transmission is specifically designed for the 1999-2002 Infiniti G20. While it shares some design similarities with other Nissan/Infiniti transmissions, it is not directly compatible with other models without significant modifications. Always verify compatibility using the vehicle's VIN and consult a professional before attempting cross-model installations.
Q2 What are the maintenance requirements for the 4r01 transmission?
What are the maintenance requirements for the 4r01 transmission?
The 4r01 transmission requires regular maintenance to ensure longevity. This includes changing the transmission fluid every 30,000 to 60,000 miles, inspecting for leaks, and replacing the filter if applicable. Additionally, check the transmission mounts and linkage for wear. Adhering to the manufacturer's maintenance schedule is crucial for optimal performance.
Q3 How do I replace the 4r01 transmission in my Infiniti G20?
How do I replace the 4r01 transmission in my Infiniti G20?
Replacing the 4r01 transmission involves several steps: 1) Disconnect the battery and drain the transmission fluid. 2) Remove the driveshaft, exhaust components, and transmission crossmember. 3) Disconnect the shift linkage, wiring harness, and cooler lines. 4) Support the engine and remove the transmission bolts. 5) Carefully lower the transmission and install the new unit in reverse order. Always refer to the service manual for detailed instructions.
Q4 What should I do if my 4r01 transmission is slipping or shifting poorly?
What should I do if my 4r01 transmission is slipping or shifting poorly?
If your 4r01 transmission is slipping or shifting poorly, start by checking the transmission fluid level and condition. Low or dirty fluid can cause these issues. Inspect for leaks, damaged wiring, or faulty sensors. If the problem persists, perform a diagnostic scan to identify error codes. Common solutions include fluid replacement, sensor repairs, or, in severe cases, transmission rebuilds.
Q5 How can I optimize the performance of my 4r01 transmission?
How can I optimize the performance of my 4r01 transmission?
To optimize the 4r01 transmission's performance, use high-quality transmission fluid and ensure it is changed regularly. Avoid aggressive driving and excessive towing to reduce wear. Consider upgrading the transmission cooler for better heat dissipation. Regularly inspect and maintain the transmission mounts, linkage, and sensors to ensure smooth operation and longevity.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1999-2002 Infiniti G20 Service Manual
Coming SoonComprehensive guide covering all aspects of the Infiniti G20, including the 4r01 transmission. Includes detailed diagrams, maintenance schedules, and troubleshooting tips.
4r01 Transmission Technical Service Bulletin
Coming SoonOfficial bulletin addressing common issues and updates for the 4r01 transmission. Includes recommended fixes and part numbers.
Infiniti G20 Parts and Accessories Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 1999-2002 Infiniti G20, including transmission components and accessories.
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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.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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