Quaife QDF43B Mercedes ATB Helical Gear LSD

Quaife QDF43B Mercedes ATB Helical Gear LSD

  • Quaife Automatic Torque Biasing (ATB) limited slip differential
  • Compatible with traction control and ABS systems
  • Controlled power supply to driven wheels
  • Direct replacement for factory diff
  • Backed by a Quaife lifetime warranty
INSTRUCTIONS

QDF43B

£1,041.66
£1,041.66

Please leave your VIN number & transmission type or part number from the diff casing sticker so we can confirm fitment

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Quaife QDF43B Mercedes ATB Helical Gear LSD

£1,041.66

Suitable For:

  • R170 SLK200 Kompressor; SLK230 manual 5-speed - modification required
  • W107/C107/R107 300SL - modification required
  • W124/S124/C124/A124 E220; 300D manual - modification required
  • W126/C126 300SEL auto 4-Speed - modification required
  • W202/S202 C230 Kompressor manual - modification required
  • W202/S202 C200; C230 Kompressor manual; C280 manual 5-speed - modification required
  • W203/CL203/S203 C200 Kompressor; C240 Auto 5-speed - modification required
  • W203/CL203/S203 C240 auto 5-speed
  • W208/C208/A208 CLK200 with FD 202-350-89-14 - modification required
  • W208/C208/A208 CLK230; CLK320 Kompressor manual - modification required
  • W123/S123/C123 280CE - modification required

The Quaife automatic torque biasing (ATB®) limited slip differential stands as the ultimate traction upgrade for any vehicle equipped with a standard factory open differential. Often imitated but never surpassed, the Quaife ATB® delivers enhanced performance, providing improved traction, handling, and braking in all driving conditions.

Trusted by road car enthusiasts and motorsport competitors alike, this precision-engineered British-made differential is a direct replacement for standard differentials and is compatible with a wide range of front, rear, and four-wheel-drive vehicles. Since its introduction in the 1980s, the Quaife ATB® has proven its durability and effectiveness in high-performance environments such as rallying, circuit racing, rallycross, and Time Attack. Enhance your vehicle's control and enjoy superior performance, whether on the track or the open road.

  • Lifetime Warranty: The Quaife ATB® comes with a lifetime warranty for both motorsport and road use, ensuring long-lasting reliability.
  • British Quality Manufacturing: Proudly made in Great Britain, the Quaife ATB® is produced to rigorous ISO9001-2008 standards for superior performance.
  • Trusted by Leading OEMs: Chosen by top manufacturers with zero warranty replacements reported.
  • Zero Maintenance Components: Gear-operated with no service parts to replace—ever, ensuring hassle-free ownership.
  • Reduces Torque Steer & Improves Handling: Dramatically minimizes unwanted torque steer, understeer, and oversteer for a smoother driving experience.
  • Seamless Compatibility: Designed to work flawlessly with modern electronic stability and traction control systems in road cars.
  • Enhanced Braking for FWD Vehicles: Improves braking performance on front-wheel-drive cars by reducing lock-up and minimizing ABS intrusion through efficient torque transfer.
  • Safe and Smooth Operation: The Quaife ATB® delivers progressive, seamless action without ever fully locking, ensuring safe and controlled driving.
  • Direct Replacement: A straightforward, direct swap for the factory ‘open’ differential unit, with no modifications required.
  • Compatible with Standard Lubrication: Retains your vehicle's standard axle lubrication system and maintenance schedule.
  • Proven Performance: With over 100,000 units sold globally since the 1980s, the Quaife ATB® is a trusted solution for improving vehicle traction and control.
  • There are no special parts required to install a Quaife ATB Differential, beyond what may normally be needed to install a stock unit. The basic parts needed will be differential bearings, transmission or rear end gaskets and possibly some shims if required.
  • When running a Quaife ATB Differential in a standard transaxle gearbox, we recommend you use the oil recommended by your vehicle’s manufacturer – the Quaife ATB Differential does not require any special lubricants
  • Torque-biasing helical gear limited slip differential - not a plate type, viscous coupling or clutch pack differential. Quaife does not specify torque bias ratio details. The Quaife ATB differential is an all-helical gear design. The angle and tooth form of the helix used, the number of pinions used and many other factors, (including the individual vehicle application in question), all contribute to how the differential behaves and biases torque across an axle
  • All of Quaife’s products are precision manufactured from certified steel billets and inspected to ISO9001-2008 standards in Britain
  • Includes assembled differential unit only. Bearings, gears, gaskets/seals etc are not included
What is a Quaife ATB Limited Slip Differential?

The Quaife ATB (Automatic Torque Biasing) Limited Slip Differential is a high-performance upgrade designed to dramatically improve traction and handling for both front-wheel and rear-wheel drive vehicles. Unlike traditional plate-type LSDs, the Quaife ATB uses helical gears to automatically distribute torque to the wheel with the most grip—without the need for electronic controls or external servos. This makes it a popular choice for performance street cars, track day builds, and motorsport applications alike.

Benefits of Installing a Quaife LSD

Installing a Quaife Limited Slip Differential provides multiple performance and durability advantages. By limiting wheelspin and maximizing traction, the Quaife ATB ensures better acceleration, enhanced cornering stability, and superior control in all driving conditions. It’s a lifetime investment thanks to its maintenance-free design—no clutches, no fluid changes, and no wear parts. The differential's fit-and-forget nature with a combined lifetime warranty.

Why Choose Quaife for Your Performance Build?

Quaife is a trusted name in drivetrain technology, with decades of engineering excellence and a proven track record in motorsport. Their ATB differentials are precision-machined in the UK and compatible with a wide range of vehicles—from hot hatches like the Ford Fiesta ST to high-powered platforms like the BMW M3. With worldwide support and dealer networks, Quaife ATB LSDs are readily available and trusted by drivers who demand the best in limited slip differential technology.
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