Blackline Limited Slip Differential - MGB - Salisbury Axle - 3.7 and 3.9 Bevel Gear Set

The Blackline limited slip differential for the MGB with a Salisbury axle and 3.7 or 3.9 bevel gear ratio, also known as an LSD (limited slip differential), improves traction by distributing torque between the two-wheel drive system 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 exert pressure 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 on-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 HLF071 limited slip differential is specifically designed for MGBs equipped with a Salisbury axle with a bevel crown gear ratio of 3.7 or 3.9. These specifications must be verified before mounting to confirm compatibility with the vehicle’s axle. Its housing and gears are made of high-strength 8620 steel.

Technical Specifications of the Blackline Limited Slip Differential for MGBs with Salisbury Axles

Manufacturer Part Number: HLF071
Quaife application equivalent: QDF6KB
Type: Helical-gear limited slip differential
Vehicle compatibility: MGB
Type of axle: Salisbury
Bevel gear ratio: 3.7 or 3.9
Torque split ratio: 5:1
Housing and gear material: High-resistance 8620 steel
Mounting: Replaces the original differential on compatible vehicles

Key features of the Blackline limited slip differential for the MGB with Salisbury axle

• Torque split between the wheels based on available traction.
• Delivers 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.