What is a transfer case fluid replacement?

In this service, a mechanic will inspect your transfer case fluid to confirm whether or not the transfer case fluid is contaminated and then perform a replacement.
In four-wheel and all-wheel-drive cars, the transfer case is a special gearbox. It distributes engine power to the front and rear axles.
The transfer case's lubricant fluid keeps the gears cool and working smoothly. This fluid should be replaced at regular intervals to avoid premature damage caused by lubricant that is contaminated or broken down.

How to replace your transfer case fluid

The mechanic will perform the following steps to perform a transfer case fluid replacement:
  • Check the fluid’s condition
  • Drain the fluid if it’s dirty/brown
  • Fill the new fluid
  • Test drive the car to check for leaks

How do I know if I need to get a transfer case fluid replacement?

It’s recommended that you get your transfer case fluid replaced every 30,000 miles at the very least. Whenever your transfer case is checked, you should also be getting your transfer case fluid inspected.
There are some other common signs that you might need to replace your transfer fluid:
  • Car is unable to change gears
  • Transfer case fluid is dirty or looks contaminated

How important is replacing my transfer case fluid?

The fluid is responsible for removing the heat and lubricating the internal parts of the transfer case. If it becomes contaminated over time, it can impact the performance of your vehicle.
Contaminated transfer fluid could lead to the following issues:
  • Shuddering when the vehicle turns
  • Whining sounds
  • Damage to your transfer case
  • Less efficiency for the car’s drivetrain system

Tips for a transfer case fluid replacement

Keep in mind that a transfer case is a specialized component found on four-wheel drive and all-wheel drive vehicles. If you have an exclusively rear-wheel-drive car, you won’t have to worry about this.
And if the transfer case fluid level is low, examine the whole transfer case for leaks.

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