BMW 740Ld xDrive Rear Differential Fluid Change Cost
How Much Does a Differential Fluid Replacement - Rear Cost?
Differential Fluid Replacement - Rear Service and Cost
The differential is an important driveline component responsible for connecting the drive shaft to the drive axles. It is also responsible for mechanical traction control in some models.
As the transmission turns the drive shaft, the drive shaft turns the pinion gear inside the differential. When the pinion gear is turned, it drives the ring gear. That gear combination transfers rotational force from the drive shaft to the drive axles.
Never drive a vehicle that is very low on gear oil in the differential. There is a strong possibility of damage to the differential, drive shaft, U-joints, and drive axles. If there is only a small leak, and it is caught early, driving the vehicle should not cause any issues.
Differential fluid changes are normally done as part of scheduled maintenance, as prescribed by the manufacturer, or due to removing the gear oil when repairing a leak on the differential.
Differential Fluid Replacement - Rear Repair Information
If the gears in the differential are making noise while driving, or a slapping noise when going into gear, but no leak is present, the fluid may need to be changed due to age, or incorrect type.
Replacing gear oil is quick and straightforward. The gear oil is drained from the lower drain plug, or by removal of the differential cover. The differential cover, if not already, is removed, and the differential housing will be cleaned and inspected. If no further repairs are needed, the differential cover is installed, and the differential will be filled with the appropriate type and grade of gear oil.
There are many brands and types of gear oil available to consumers. Many manufacturers supply a proprietary type that is designed to meet the specifications of that vehicle. They may also indicate optional recommended brands. These recommendations should be followed to help ensure the longevity of the differential.
If vehicles are used in a method consistent with severe duty, as described by the owner’s manual, the severe duty service schedule should be followed. This will include a shorter interval for changing differential oil.
The experienced DIYer can handle this job with a set of jack stands and a few basic tools and a small torque wrench. This job requires working underneath a raised vehicle, and extreme caution should be exercised. If the individual completing the repair is not experienced with safely lifting and supporting a vehicle, this job should be left to a professional technician.