Blackline limited slip differential - Triumph Dolomite Sprint - Stag - TR2 - TR3 - TR4 - TR5 - TR6

The Blackline limited slip differential for the Triumph Dolomite Sprint, Stag, TR2, TR3, TR3A, TR4A, TR5, and TR6—also known as an LSD (limited slip differential)—improves traction by distributing torque between the two-wheel drive drive wheels based on available grip.

Its helical gear design allows the limited slip differential to transmit more torque to the wheel with the best traction. As torque increases, the gears press against the differential housing and generate the internal friction necessary for this torque distribution. The system can thus handle a significant difference in drive force between the two wheels, particularly during heavy acceleration out of a turn or when traction is limited.

Under light loads, the helical limited slip differential maintains smooth, progressive, and quiet operation. The wheels can continue to rotate at different speeds when necessary, particularly when cornering. This feature enhances traction during spirited driving while maintaining handling suitable for road use.

The Blackline limited slip differential uses a parallel-shaft helical gear architecture optimized to distribute forces. Its 5:1 torque split means that when one of the wheels loses traction, the wheel with the most traction can receive up to five times the torque transmitted to the spinning wheel.

As with any helical-gear limited slip differential, a minimum amount of resistance must remain on the wheel with the least grip to allow torque transfer. It is therefore most effective when both wheels retain a minimum amount of resistance.

The Blackline HLF081 limited slip differential is designed for the Triumph Dolomite Sprint, Stag, TR2, TR3, TR3A, TR4A, TR5, and TR6. Depending on the application, special attention must be paid to the differential’s center shaft during installation: it must be retained or removed in accordance with the configuration of the specific axle.

Technical Specifications of the Blackline Limited Slip Differential for Triumph Dolomite Sprint, Stag, and TR2 through TR6

Manufacturer Part Number: HLF081
Quaife Application Equivalent: QDF23K
Type: Helical-gear limited-slip differential
Triumph compatibility: Dolomite Sprint
Triumph Compatibility: Stag
Triumph compatibility: TR2, TR3, TR3A, TR4A, TR5, and TR6
Torque split ratio: 5:1
Mounting Note: Mounting of the center differential shaft must be adapted to the specific application
Housing and Gear Material: High-resistance 8620 steel
Mounting: Replaces the original differential on compatible models

Key Features of the Blackline Limited Slip Differential for Triumph Dolomite Sprint, Stag, and TR

• Torque split between the wheels based on available traction.
• Transmits more torque to the wheel with the best traction.
• Immediate and progressive reaction to changes in traction.
• Smooth, progressive, and quiet operation.
• No friction discs for reduced maintenance requirements.
• Power delivery that is easily controllable, especially during spirited driving and drifting.
• Housing and gears made of high-resistance 8620 steel.
• Mounts as a replacement for the stock differential on compatible vehicles.