BMW E81 Quaife Limited-slip REAR DIFFERENTIAL. FITTING SERVICE ALSO AVAILABLE. All my differentials are built by my self by hand in house every part is scrutinized and inspected and nothing is left to chance. My differentials are fully reconditioned units which means all serviceable parts are replaced. I find my self more and more repairing differentials that have apparently been reconditioned months prior to find out that all that may have been changed is the absolute minimum or nothing at all. My differentials are properly rebuilt automotive parts. The item has been completely disassembled, cleaned and examined for wear and breakage. Worn out, missing or non-functioning components have been replaced with new or rebuilt components. It is the functional equivalent of a new part and is virtually indistinguishable from a new part. As well as a lack of lubrication to the cone bearings they become very problematic and start failing. A modification is now implemented to allow more oil to the bearings. Modified bearings setup in house to my own specific tolerances. We provide the highest quality reconditioned genuine BMW differentials. The differentials are reconditioned with genuine OE components, bearings are a modified item to resolve the fault in design, fully stripped down, cleaned using our in house ultrasonic cleaner, tolerances, preload spec and contact mesh checked along with all new seals, and non consumables replaced. Units are checked fully and tested before dispatch. Currently and one of very few companies in the UK – possibly the only one – able to offer this upgrade. We have many options in respect to mods, up rated / improved parts, and processes implemented. So you can feel rest asssuered that you are purchasing a quality engineered component. The workmanship and attention to detail that goes into one of our Differential builds is bar non you will not find any corners cut here. We pride our selves on our Differentials not only internal but external and guarantee our Units for 12 months. All my Differential are built by my self by hand in house every part is scrutinized and inspected and nothing is left to chance. My Differential are fully reconditioned units which means all serviceable parts are replaced. I find my self more and more repairing Differentials that have apparently been reconditioned months prior to find out that all that may have been changed is the absolute minimum or nothing at all. All preload shims custom ground in house to a 1 micron tolerance. A properly rebuilt automotive part. Rebuild includes full strip and cleaning of internal oiling system, with modifications to increase oil flow. We’ll also guarantee our work for 1 years, or 12,000 miles (whichever comes first) on fitted Differential, 6 months / 6,000 miles on’take-away’ units and 3 months for all auxiliary parts. This will help you when it’s time to return your old Differential. This can be arranged at an extra cost. Scottish Highlands and Northern Ireland post codes available at an additional cost. The old Differential needs to be unmolested and serviceable, what this means is that the Differential needs to come complete not stripped or dismantled, and must have no holes or damage to the case. If your Differential is leaking oil from the case or has no drive, then its safe to say that the Differential is most likely non serviceable. Once the new Differential has been received simply refrain all packaging and securing fixings, these will assist you when returning the old Differential. This can be extended considerably if the Differential is a bespoke item and requires a build slot. Our workshop hours are 9.00am – 6.00pm Monday – Friday and 9.00am – 1pm Saturday.