How To Check Transfer Case Fluid
Video How to check transfer case liquid
What is the transfer case?
Contents
(From HowStuffWorks with modifications.) This diagram illustrates the various components of a four-wheel drive system. The gear box takes power from your transmission and divides it between the front and rear wheels. Some transfer cases are selectable, meaning you can choose between two- and four-wheel drive, while others offer full-time all-wheel drive. Some gearshifts offer low gear range, which is an additional downshift to increase torque to the wheels, at the expense of vehicle speed. This is displayed as “Low 4WD” on most vehicles. Some gearshifts can vary the amount of torque delivered to the front or rear, while others split the torque evenly all the time. called a power breaker, or PTU.
What is case shifting?
Your transfer case is filled with fluid that lubricates and cools the internal components. In some gearshift cases, the fluid also supplies lubrication to the wet clutch, which is used to change how much power is transmitted to the front or rear wheels. Most transmissions are filled with automatic transmission fluid, which is usually red. Others use a thicker gear oil, and some use a specialized fluid specifically made for that gear shift.
Why is it necessary to change the fluid in the case of an infusion?

- Extreme pressure (EP) additives protect against wear. These additives can eventually react with water that forms inside the case due to condensation, forming acids that can damage seals and other components.
- Detergent works to trap dirt and debris, suspending so dirt cannot cause scratches or abrasion. Eventually, the detergent in the liquid becomes “full” and cannot hold any more material.
- Corrosion inhibitors prevent rust and oxidation inside the housing. These additives also become less effective as they age.
- Antifoam agents prevent the oil from foaming as the gears rotate through it. These chemicals are extremely important, as foaming oils have air bubbles in them, which weaken the vital fluid barrier between components.
- The friction modifier helps to prolong the life of the clutch.
Replacing a transfer case can cost anywhere from $1500 to $5000, depending on the vehicle type. The best way to protect this expensive component is to perform regular replacement of the liquid of the fairly inexpensive switch box.
How often should the fluid be changed in case of an infusion?
When to replace the fluid in your transmission varies widely from vehicle to vehicle. Some vehicles require transfer service every 25,000 km, while others need not care until 100,000 km or more. We generally recommend that you follow your vehicle manufacturer’s recommended maintenance intervals, which can be found in your owner’s manual. We’d be happy to look this up for you too! There are some rare instances where we recommend replacing your transfer case fluid before the manufacturer’s warranty period, such as a “lifetime” transfer box fluid. This fluid doesn’t last forever, and “lifetime” usually means the life of the transfer case, and certainly not the life of the vehicle!
Replace the transfer box fluid:

Changing the transmission fluid in the Airdrie:
If you’re looking for help with proper vehicle maintenance, including replacing your transmission fluid, we’re here to help! We take vehicle maintenance seriously and we stock over 15 different genuine OEM transfer case fluids to properly care for your vehicle. If you would like us to provide an estimate for a service or even if you just have a question, please get in touch! Read more: how to convert veg to mp4
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