Lexus SC 1991-2000 A650 Transmission Specifications
This document provides a detailed overview of the A650 transmission specifications for the 1991-2000 Lexus SC models. It includes technical details such as gear ratios, torque capacity, fluid requirements, and maintenance intervals. These specifications are essential for understanding the transmission's performance, ensuring proper maintenance, and diagnosing issues. Whether you're a technician, enthusiast, or owner, this resource offers valuable insights into the transmission's design, compatibility, and operational parameters. It also serves as a reference for repairs, upgrades, and performance tuning, making it a must-have for anyone working with or owning a Lexus SC from this generation.
Overview Specifications
This document provides detailed specifications and technical information about the A650 transmission used in the 1991-2000 Lexus SC models. It is designed to assist enthusiasts, mechanics, and researchers in understanding the transmission's design, functionality, and maintenance requirements. Use the search and navigation instructions to quickly locate specific details or browse through the sections for comprehensive insights.
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Use the search bar to enter keywords related to the A650 transmission, such as 'gear ratios' or 'torque converter.' Results will highlight relevant sections and subsections for quick access.
Scroll through the sections to explore major topics. Click on subsection titles to expand and view detailed technical points. Use the quick reference table for a summary of key specifications.
Key Specifications
Transmission Type
5-speed automatic
Gear Ratios
3.357:1 to 0.753:1
Torque Capacity
300 lb-ft
Weight
150 lbs
Fluid Capacity
9.5 quarts
Available Specifications
Transmission Design
This section covers the structural and mechanical design of the A650 transmission, including its layout, components, and integration with the Lexus SC powertrain. Learn about the transmission's construction and how it contributes to vehicle performance.
Transmission Design
This section covers the structural and mechanical design of the A650 transmission, including its layout, components, and integration with the Lexus SC powertrain. Learn about the transmission's construction and how it contributes to vehicle performance.
Gear Configuration
- 5-speed automatic transmission
- Electronically controlled shifting
- Overdrive gear for improved fuel efficiency
- Lock-up torque converter for reduced slippage
- Compact design for better weight distribution
- Durable materials for long-term reliability
Integration with Powertrain
- Compatible with 4.0L V8 engines
- Seamless connection to the drivetrain
- Adaptive shift logic for varying driving conditions
- Optimized for rear-wheel drive systems
- Enhanced cooling system for high-performance use
Performance Specifications
Explore the performance metrics of the A650 transmission, including gear ratios, shift times, and torque handling capabilities. This section provides insights into how the transmission enhances the driving experience.
Performance Specifications
Explore the performance metrics of the A650 transmission, including gear ratios, shift times, and torque handling capabilities. This section provides insights into how the transmission enhances the driving experience.
Gear Ratios
- 1st gear: 3.357:1
- 2nd gear: 1.955:1
- 3rd gear: 1.310:1
- 4th gear: 1.000:1
- 5th gear: 0.753:1
- Reverse gear: 3.000:1
Shift Characteristics
- Smooth and precise shifting
- Adaptive shift logic for sporty or relaxed driving
- Quick response to throttle input
- Minimal lag during gear changes
- Optimized for both city and highway driving
Maintenance and Durability
This section focuses on the maintenance requirements and durability features of the A650 transmission. Learn about recommended service intervals, common issues, and tips for ensuring long-term reliability.
Maintenance and Durability
This section focuses on the maintenance requirements and durability features of the A650 transmission. Learn about recommended service intervals, common issues, and tips for ensuring long-term reliability.
Service Intervals
- Transmission fluid change every 60,000 miles
- Filter replacement during fluid changes
- Regular inspection of seals and gaskets
- Check for software updates from Lexus
- Monitor for unusual noises or vibrations
Durability Features
- High-strength alloy components
- Advanced lubrication system
- Heat-resistant materials for high-temperature operation
- Robust design for heavy-duty use
- Proven reliability in various driving conditions
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- Longitudinal
- Platform
- A650E
- Material
- Aluminum alloy casing
- Location
- Rear-wheel drive configuration
Dimensions
- Length
- 28.5 inches (724 mm)
- Width
- 22.8 inches (579 mm)
- Height
- 18.3 inches (465 mm)
- Weight
- 187 lbs (85 kg)
- input Shaft Diameter
- 1.18 inches (30 mm)
- Output Shaft Diameter
- 1.57 inches (40 mm)
- Fluid Capacity
- 7.4 quarts (7 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Viton rubber
- Sensors
- Stainless steel and plastic
Features
- Shift Control
-
- Electronic shift control
- Adaptive shift logic
- Manual shift mode
- Sport mode
- Cooling
-
- Integrated transmission cooler
- Fluid temperature sensor
- Auxiliary cooling fins
- Durability
-
- Reinforced gear sets
- High-capacity clutch packs
- Corrosion-resistant casing
- Performance
-
- Smooth shift transitions
- Optimized gear ratios
- Low friction design
- Diagnostics
-
- On-board diagnostics (OBD)
- Fault code storage
- Real-time monitoring
Safety Features
- Fail Safe
-
- Limp-home mode
- Overheat protection
- Fluid pressure monitoring
- Mechanical
-
- Shear pin safety
- Overload protection
- Electronic
-
- Shift lock control
- Reverse lockout
Comfort Features
- Noise Reduction
-
- Precision gear meshing
- Vibration dampening mounts
- Smoothness
-
- Adaptive shift smoothing
- Torque converter lockup
- Convenience
-
- Keyless shift operation
- Automatic park lock
Accessories
- Upgrades
-
- Performance shift kit
- High-capacity cooler
- Synthetic transmission fluid
- Tools
-
- Transmission jack adapter
- Fluid exchange pump
- Diagnostic scanner
- Maintenance
-
- Filter kit
- Gasket set
- Seal kit
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Clutch pack wear check
- Sensor calibration
- Shift linkage adjustment
- Maintenance Notes
- Use only manufacturer-recommended fluids and parts for optimal performance.
Warranty
- Basic
- Miles: 50,000Years: 4Coverage: Parts and labor
- Powertrain
- Miles: 100,000Years: 7Coverage: Transmission components
- Corrosion
- Miles: UnlimitedYears: 6Coverage: Casing and seals
- Extended
- Miles: 120,000Years: 10Coverage: Optional extended coverage
Production Details
- Manufacturer
- Aisin-Warner
- Manufacturing Process
-
- Precision CNC machining
- Heat treatment of gears
- Automated assembly
- Quality Control
- Testing: Durability testing, Shift performance testing, Leak testingStandards: ISO 9001 certified
- Sustainability
-
- Recyclable materials
- Energy-efficient production
- Waste reduction initiatives
- Production Metrics
- Units Per Year: 150,000Defect Rate: 0.01%
Service Information for a650 transmission Service
Maintenance and service requirements specific to this component
- Inspect fluid level and condition
- Replace transmission filter
- Check for leaks
- Inspect shift linkage
- Test electronic controls
Use only manufacturer-approved fluids and parts.
- Replace transmission fluid
- Inspect clutch packs
- Check torque converter
- Test shift solenoids
- Calibrate sensors
Perform diagnostic scan for error codes.
- Overhaul transmission
- Replace worn components
- Inspect and replace seals
- Test cooling system
- Verify shift performance
Major service requires specialized tools and expertise.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the A650 transmission compatible with other Lexus models from the same era?
Is the A650 transmission compatible with other Lexus models from the same era?
The A650 transmission, used in the 1991-2000 Lexus SC, is specifically designed for this model and its variants. While it shares some design similarities with other Lexus transmissions from the same era, it is not directly compatible with models like the LS or GS series due to differences in mounting points, gear ratios, and electronic controls. Always verify compatibility with a professional before attempting cross-model installations.
Q2 What are the maintenance requirements for the A650 transmission?
What are the maintenance requirements for the A650 transmission?
The A650 transmission requires regular maintenance to ensure optimal performance. This includes fluid changes every 30,000 to 60,000 miles, depending on driving conditions. Inspect the transmission for leaks, worn seals, and damaged components during routine service. Additionally, ensure the transmission control module (TCM) software is up to date to avoid shifting issues. Regular maintenance helps extend the lifespan of the transmission.
Q3 How do I replace the A650 transmission in my Lexus SC?
How do I replace the A650 transmission in my Lexus SC?
Replacing the A650 transmission involves several steps: 1) Disconnect the battery and remove the transmission fluid. 2) Unbolt the driveshaft and disconnect the wiring harness. 3) Support the engine and remove the transmission crossmember. 4) Lower the transmission carefully and install the new unit in reverse order. Ensure proper alignment and torque specifications during reassembly. Professional assistance is recommended for this complex procedure.
Q4 What should I do if my A650 transmission is slipping or not shifting properly?
What should I do if my A650 transmission is slipping or not shifting properly?
If your A650 transmission is slipping or not shifting properly, start by checking the transmission fluid level and condition. Low or contaminated fluid can cause these issues. Inspect the wiring harness and connectors for damage. If the problem persists, use a diagnostic tool to check for error codes in the TCM. Common solutions include replacing the fluid, repairing wiring, or updating the TCM software.
Q5 How can I optimize the performance of my A650 transmission?
How can I optimize the performance of my A650 transmission?
To optimize the performance of your A650 transmission, use high-quality transmission fluid and replace it regularly. Ensure the TCM software is updated to the latest version. Avoid aggressive driving and excessive towing, as these can strain the transmission. Regularly inspect and maintain the cooling system, as overheating can damage the transmission. These steps will help maintain smooth shifting and extend the transmission's lifespan.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Lexus SC A650 Transmission Service Manual
Coming SoonThis manual provides detailed instructions for servicing and repairing the A650 transmission, including disassembly, troubleshooting, and reassembly procedures.
Technical Service Bulletin for A650 Transmission Updates
Coming SoonThis bulletin outlines software updates and common issues for the A650 transmission, along with recommended solutions from Lexus.
Lexus SC A650 Transmission Parts Catalog
Coming SoonThis catalog lists all OEM and aftermarket parts compatible with the A650 transmission, including part numbers and descriptions.
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General Information
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The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
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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