Quaife ATB BMW Limited Slip Differential Conversions
The Quaife ATB Differential provides significantly improved traction and handling for powerful rear-wheel drive cars, and is a must-have upgrade for BMW owners looking to maximise the potential of their machines.
Once installed, drivers will notice an immediate difference as the Quaife's ATB design automatically biases torque across the axle to the wheel with most grip. Unwanted wheel-slip is greatly reduced, and the driver is able to put the power down in a controllable and seamless fashion for the first time.
Why is the Quaife ATB superior to other LSDs?
Widely regarded as the differential upgrade of choice for road car owners, the Quaife ATB was designed to overcome the flaws of all conventional clutch-plate limited-slip differentials, such as BMW's M-Performance LSD.
The Quaife ATB;
- doesn't wear or require maintenance
- will not deteriorate in performance
- comes with a limited lifetime warranty
- offers a progressive deployment of power rather than locking, providing more user-friendly characteristics and control during moments of oversteer
- is capable of biasing 80% of torque to the wheel with most grip, instead of a fixed locking percentage
- works seamlessly with all standard components and electronics
- will not invalidate the manufacturer's warranty
British manufacturer RT Quaife Engineering LTD is a global leader in the automotive drivetrain industry, supplying motorsport users, volume OEM and commercial customers with a wide variety of performance products since 1965. The innovative Quaife ATB Differential, their flagship product, was chosen by FORD to use as standard equipment in a number of their performance models - a testament to their reputation for quality and reliability. Its patented, non-wearing design is unique and proven over many decades and in various applications.
Exchange QUAIFE LSD Differential
The Exchange QUAIFE LSD Differential by Birds is a complete BMW differential equipped with a Quaife ATB LSD. We offer to install or ship the units in exchange for the customer’s existing standard differential.
This is only offered to customers with vehicles under 60,000 miles. Customers with vehicles over this mileage will either need to have their original differential converted (we will need the differential here for 5 working days to complete the conversion), or purchase an Exchange QUAIFE LSD with High Performance Bearings.
Worldwide shipping is available. If we ship the Exchange QUAIFE LSD Differential to the customer first, a £500 (excl.VAT) surcharge is charged until we receive the customer's original differential in return.
Birds guarantees the bearings and all other internal wearing parts in their Exchange QUAIFE LSD Differentials for 24 months, and the Quaife ATB itself comes with a limited lifetime warranty.
Exchange QUAIFE LSD & High Performance Bearings
The Exchange QUAIFE LSD with High-Performance Bearings is a complete BMW differential equipped with a Quaife ATB LSD and all new high-performance bearings, in exchange for the customer's existing standard differential.
The uprated tapered bearings offer a 44% increase in load capacity compared to the standard BMW ball bearings, providing much more durability and a longer lifespan. We have these specially made in the UK.
This is offered to customers with vehicles of all mileages.
Worldwide shipping is available. If we ship the Exchange QUAIFE LSD with High-Performance Bearings to the customer first, a £500 (excl.VAT) surcharge is charged until we receive the customer's original differential in return.
Birds guarantees the bearings and all other internal wearings parts in the Exchange QUAIFE LSD with High-Performance Bearings for 36 months, and the Quaife ATB itself comes with a limited lifetime warranty.
Can I buy the QUAIFE LSD only?
Yes, you can buy the Quaife LSD on its own. However, the reason we offer our exchanges is due to the difficulties of installing the Quaife LSDs into these differential housings.
In 2007, BMW began welding the crownwheel gear to the open differential instead of bolting them together. This means that the crownwheel gear must be machined off, drilled and tapped, so that the Quaife LSD can be bolted onto the crownwheel and put back together. It requires specialist set up and experience. While this a routine procedure for us, most workshops can't or won't want to carry out this work.
We do have a number of Quaife BMW Distributors around the world that are capable of carrying out this process, including the USA, Russia, Australia, China, and many European countries. We can also provide technical drawings and installation guides.