The Blackline limited slip differential for Ford Escort, Fiesta, Focus, Ka, Orion, and Puma models with BC or IB5 transmissions—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 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 improves 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 wheel 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 traction to allow torque transfer. It is therefore most effective when both wheels remain in contact with the ground. This technology also works particularly well in conjunction with modern ABS systems.
The Blackline HLF013 limited slip differential is designed for front-wheel-drive Fords equipped with a BC or IB5 transmission. It installs as a direct replacement for the stock differential. Its housing and gears are made of high-strength 8620 steel.
Manufacturer Part Number: HLF013
Quaife application match: QDF7Z
Type: Helical-gear limited slip differential
Vehicle compatibility: Front-wheel-drive Ford Escort, Fiesta, Focus, Ka, Orion, and Puma
Type of box: BC or IB5
Drivetrain: Front-wheel drive
Torque split ratio: 5:1
Housing and gear material: High-resistance 8620 steel
Mounting: Direct replacement for the original differential
