Quaife QDF14N BMW 188K ATB Helical Gear LSD

Quaife QDF14N BMW 188K 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
TECHNICAL DRAWING

QDF14N

£1,049.99
£1,049.99

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 QDF14N BMW 188K ATB Helical Gear LSD

£1,049.99

Medium case 188mm (29.5mm offset) 10 bolt crown wheel differential

Suitable For:

  • E81 118d manual
  • E82 120d manual
  • E87 116d manual; 120d auto up to 01/2007; 120d manual
  • E46 320d auto; 320d manual (2.79:1 ratio); 323i manual; 328i; 330i manual; 330xd
  • E90 318d; 320d manual (7566218 & 7566274 diff); 325d; 330d; 325i manual (7566172 diff); 330dx auto
  • E92 320d; 325d; 330d; 325i manual (7519942 diff); 330dx auto
  • E39 520d manual; 525d auto; 525i manual; 528i manual; 530i manual; 535i; Alpina B10 3.2 manual (2.93:1 ratio) / Alpina B10 3.3 manual
  • E60 520d manual; 525d auto after 03/2007; 530i manual
  • E83 X3 3.0d manual rear axle
  • F25 X3 SDrive 2.0d rear axle
  • E53 X5 3.0d manual rear axle
  • E85 Z4 2.2i manual; 3.0i manual; 3.0i SMG

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
  • Quaife ATB Differential and pair of output shaft seals
  • Bearings, gears, gaskets etc 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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