Audi Audi S4 2003-2008

Audi Audi S4 2003-2008 AL450 Transmission Specifications

This document provides detailed technical specifications for the AL450 transmission used in the 2003-2008 Audi S4. It includes key measurements, performance metrics, compatibility information, and maintenance requirements. The AL450 is a 6-speed manual transmission designed for high-performance applications, featuring a strengthened gearbox and advanced synchronizer technology. These specifications are essential for technicians, enthusiasts, and owners looking to maintain, repair, or upgrade their vehicle. The information covers torque capacity, gear ratios, lubrication requirements, and compatibility with specific engine and drivetrain configurations.

Updated Feb 10, 2025

Audi S4 AL450 Transmission Specifications Overview Specifications

This document provides a comprehensive guide to the specifications and technical details of the AL450 transmission used in the 2003-2008 Audi S4. It includes key features, operational parameters, and maintenance recommendations. Use this guide to understand the transmission's capabilities, identify components, and perform routine maintenance. Navigate through the sections to find detailed information organized by category, or use the quick reference section for fast access to key specifications.

How to Use

To search for specific information, use the search functionality by typing keywords such as 'gear ratios,' 'fluid capacity,' or 'torque capacity' in the search bar. This will highlight relevant sections and subsections for quick access.

Navigate through the document by scrolling through the sections listed in the table of contents. Each section is divided into subsections with detailed technical points. Use the quick reference section for a concise overview of key specifications.

Key Specifications

▲

Transmission Type

6-speed automatic

■

Gear Ratios

4.171 (1st) to 0.691 (6th)

●

Torque Capacity

280 Nm (207 lb-ft)

◆

Fluid Capacity

6 liters (6.3 quarts)

★

Weight

Approx. 125 kg (276 lbs)

Available Specifications

General Specifications

This section provides an overview of the AL450 transmission's general specifications, including its type, design, and key features. It is essential for understanding the transmission's basic characteristics and capabilities.

Transmission Type and Design

6-speed automatic transmission with manual mode
Torque converter with lock-up clutch
Electronically controlled gear shifts
Adaptive shift strategy based on driving conditions
Tiptronic manual shift mode available
All-wheel drive compatible

Gear Ratios

1st gear: 4.171
2nd gear: 2.531
3rd gear: 1.667
4th gear: 1.229
5th gear: 0.927
6th gear: 0.691
Reverse gear: 3.677

Gearbox and Drivetrain

This section details the technical specifications of the AL450 transmission's gearbox and drivetrain components, including torque capacity, gear material, and lubrication system.

Torque and Power Capacity

Maximum torque capacity: 280 Nm (207 lb-ft)
Designed for engines up to 250 horsepower
Optimized for high-performance driving
Torque converter stall speed: 2,000 RPM
Maximum engine speed: 6,500 RPM
Compatible with 4.2L V8 engine

Gearbox Components

Planetary gear sets for compact design
High-strength steel gear components
Bearing and synchronizer packages for smooth shifting
Hydraulic control system for precise gear engagement
Copper-based clutch packs for durability
Aluminum transmission housing for weight reduction

Maintenance and Service

This section provides maintenance and service recommendations for the AL450 transmission, including fluid specifications, filter replacement intervals, and diagnostic procedures.

Fluid and Filter Specifications

Transmission fluid type: Audi-approved ATF
Fluid capacity: 6 liters (6.3 quarts)
Filter replacement interval: Every 30,000 miles
Pan gasket replacement recommended with filter
Fluid change interval: Every 60,000 miles
Use of synthetic fluid recommended for optimal performance

Diagnostic and Service Procedures

Transmission control module (TCM) software updates
Adaptive learning reset procedure after fluid change
Solenoid pack replacement procedure
Pressure test ports for hydraulic system diagnosis
Scan tool connectivity for real-time data monitoring
Regular inspection of transmission mounts and bellhousing

Performance Capabilities

This section highlights the performance capabilities of the AL450 transmission, including acceleration, shifting characteristics, and compatibility with high-performance driving conditions.

Shifting Characteristics

Quick shifting in manual mode (approx. 200ms)
Adaptive shift logic for sport and comfort modes
Throttle-blip downshifts in manual mode
Kick-down function for instant acceleration
Smooth torque delivery during upshifts
Progressive shift mapping based on throttle input

Compatibility and Integration

Fully integrated with Audi quattro all-wheel drive
Compatible with dynamic stability control (DSC)
Adaptive cruise control integration
Paddle-shift compatibility (if equipped)
Sport mode activation for aggressive shifting
Snow mode for improved traction in low-grip conditions

Troubleshooting and Repair

This section provides common issues, diagnostic codes, and repair procedures for the AL450 transmission, helping technicians identify and resolve problems effectively.

Common Issues and Diagnostic Codes

P0700: Transmission control system malfunction
P0715: Invalid input from primary speed sensor
P0740: Torque converter clutch solenoid circuit
P0750: Shift solenoid A circuit
P0760: Shift solenoid B circuit
P0860: Gear ratio error

Repair and Replacement Guidelines

Solenoid pack replacement procedure
Torque converter replacement steps
Transmission pan gasket replacement
Filter and fluid replacement best practices
TCM reprogramming after repairs
Bleeding the hydraulic system

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Transmission Specifications

Technical Specs

Dimensions: Length: 560mm, Width: 720mm, Height: 400mm

Performance: Gear Ratios: 1st: 3.67, 2nd: 2.05, 3rd: 1.46, 4th: 1.13, 5th: 0.92, 6th: 0.78, Reverse: 3.17

Maintenance: Fluid Capacity: 3.5 liters, Recommended Fluid: Audi Genuine Transmission Fluid

Features

0: 6-speed manual transmission

1: Quattro all-wheel drive system

2: Dual-mass flywheel

Service Information Service

Detailed service requirements and schedules for the al450-transmission

30000

Transmission fluid check
Inspect shift linkage
Check fluid levels
Inspect mounts

Use manufacturer recommended transmission fluid

60000

Transmission fluid change
Inspect valve body
Clean transmission filter
Adjust shift linkage

Check for transmission slippage

Common Questions

Find answers to common questions about torque specifications

What are the technical specifications of the AL450 transmission?

The AL450 transmission is a 6-speed automatic transmission designed for the Audi S4 (2003-2008). It features a torque capacity of up to 229 lb-ft and is compatible with the 3.0L V6 engine. It includes a lock-up torque converter, planetary gear sets, and an electronic control module for smooth shifting. Compatibility is confirmed for B6/B7 platform models.

What are the recommended maintenance requirements?

Regular maintenance for the AL450 transmission includes fluid changes every 30,000-60,000 miles using Audi-approved ATF. Filter replacement is recommended every 30,000 miles. Check transmission mounts and pan gasket for leaks annually. Ensure proper electronic control module software updates are applied as specified by Audi service intervals.

How do I install or replace the AL450 transmission?

Transmission replacement requires lifting the vehicle and removing the driveshaft, exhaust, and crossmember. Disconnect electrical connectors and fluid lines. Remove mounting bolts and slide transmission out. Install new transmission, ensuring proper alignment and torque specifications. Reconnect all components and refill with Audi-approved ATF. Follow factory service manual procedures for precise steps.

How do I troubleshoot common issues?

Common issues include slipping gears, delayed engagement, or abnormal noises. Check transmission fluid level and condition. Scan for fault codes using an OBD-II scanner. Inspect for fluid leaks or damaged sensors. Replace faulty solenoids or valve body components as needed. If slipping persists, consider rebuilding or replacing the transmission.

How can I optimize transmission performance?

Optimize performance by using high-quality transmission fluid and maintaining proper fluid levels. Avoid aggressive driving or towing beyond capacity. Install a transmission cooler for heavy-duty use. Consider aftermarket tuning for improved shift firmness and response. Regular servicing and monitoring will ensure optimal performance 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.

Audi S4 AL450 Transmission Service Manual

Coming Soon

Comprehensive guide covering transmission repair, maintenance, and troubleshooting procedures.

Technical Bulletin: AL450 Transmission Updates

Coming Soon

Official updates and service bulletins for AL450 transmission improvements and recalls.

Audi S4 Parts Catalog

Coming Soon

Detailed listing of transmission parts, filters, and accessories for the AL450.

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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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