How often does my car need new transfer case fluid?

The transfer case is part of the transmission system. Its main function is to engage the axles of multi-axle vehicles. The transfer box, located under the vehicle, consists of an aluminum or steel housing and contains…

The transfer case is part of the transmission system. Its main function is to engage the axles of multi-axle vehicles. The transfer case, located under the vehicle, consists of an aluminum or steel case and contains a complex system of chains, belts or gears. The transfer case works by dividing the engine torque from the transmission, transferring it to the output shafts, which are connected to the drive shafts leading to the front and rear axles. Most transfer cases can mechanically lock the front and rear drive shafts together so each axle gets equal engine torque.

Why is transfer case fluid important?

Transfer case fluid is a synthetic or conventional gear oil, but like many vehicles, some vehicles require certain types of transfer case fluids. It removes heat and lubricates the inside of the transfer case, keeping the gears cool and turning smoothly.

Over time, the transfer case fluid becomes contaminated due to the formation of carbon deposits when hot transmission components cool. This may affect the operation of the vehicle, causing the vehicle to shake when cornering or making whining sounds. If the fluid runs out or becomes contaminated, the differential may fail. To avoid this problem, it is recommended to periodically change the transfer case fluid, typically every 30,000 miles, especially in vehicles that frequently tow or use 70,000WD. When the vehicle is used for towing or often has four-wheel drive, transfer case fluid is more likely to flow through the system. These actions require more torque, which means more heat is transferred. So while it might be tempting to wait up to XNUMX miles (or more) to change the transfer case fluid, waiting can mean less efficient use of the car's transmission system.

Changing the transfer case fluid regularly will reduce the chance of any handling problems. A transfer case fluid change can be done much faster and for less money than a differential change.