Why Service Your Transfer Case?

The transfer case is an essential part of the drivetrain of four-wheel-drive (4WD) and other multi axled vehicles. What does it do? And why is servicing it so important?

The transfer case is a crucial component in the drivetrain of four-wheel-drive (4WD) and all-wheel-drive (AWD) vehicles, as it serves the essential function of transferring power from the transmission to both the front and rear axles. This device is typically controlled by the driver through a shifter mechanism, allowing them to switch between different drive modes, including 2-wheel-drive (2WD), 4-wheel-drive (4WD), and, if available, an off-road mode designed for challenging terrain. The ability to select these modes provides drivers with the flexibility to optimize their vehicle's performance based on driving conditions, whether on smooth highways or rugged backroads.

In its operation, the transfer case must perform similarly to a differential, which is another vital component in the vehicle’s drivetrain. (Click here to read about the differential!) It synchronizes the rotational speed of each wheel, accommodating the differences in wheel speed during normal driving situations. This synchronization is essential for maintaining traction and stability, particularly when navigating curves or varying road surfaces. In off-road mode, the transfer case enhances the vehicle's capability by mechanically locking the front and rear drive shafts. This locking mechanism prevents slippage on surfaces like mud, snow, or loose gravel, thereby providing increased traction for the remaining wheels and improving the vehicle's overall off-road performance.

Given the complexity of the transfer case, which includes numerous moving parts and various mechanisms, it is vital to ensure it remains well-lubricated. Proper lubrication is critical because the oil inside the transfer case serves to reduce friction between the moving components, preventing wear and tear. Over time, however, this oil can degrade, becoming thin and less effective at providing the necessary lubrication. When the oil loses its efficacy, it can lead to metal-to-metal contact between parts, resulting in significant damage as components grind against each other. If a transfer case fails and the vehicle continues to be driven, it may lead to catastrophic failures, such as the breaking of the driveshaft or axle shafts, which can result in costly repairs and potentially dangerous driving conditions. Check out the video below to see an AWD transfer case in action.

If you suspect that your transfer case may be experiencing issues, have it serviced as soon as possible! And look for these key signs:

• Fluid leaking from the transfer case, which may appear as puddles or spots under the vehicle.

• The “Service 4WD” light illuminating on the dashboard, signaling a malfunction in the 4WD system.

• Chattering or cracking noises when turning, which can indicate internal issues within the transfer case.

• Abnormal noises emanating from the center of the vehicle, suggesting potential mechanical failures.

• Black smoke emissions while driving, which may indicate severe engine or drivetrain problems.

When it comes to the financial aspect of maintaining your transfer case, the average cost of a transfer case replacement can range typically between $2,389 and $2,500, depending on the make and model of the vehicle. Additionally, labor costs can add another $500 or more to the total expense. To help prevent such costly repairs, it is recommended that vehicle owners adhere to milestone service intervals, with some sources suggesting inspections every 30,000 miles. Regular maintenance not only keeps the transfer case in optimal condition but also ensures the overall health of the vehicle. If you notice any signs of performance issues or suspect that something may be wrong, it is wise to bring your car in for a thorough check-up, as early detection can prevent more extensive and expensive repairs down the line.

Your local Flash Lube Oil (dba Shell Rapid Lube) is fully equipped to perform routine checks and service your transfer case, ensuring it operates smoothly and efficiently.*

*Please note that while we offer comprehensive servicing for vehicles, we do not provide repairs or replacements for parts such as the transfer case.

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Come on down to your local Shell Rapid Lube owned and operated by Flash Lube Oil! Your friends down here are happy to service your vehicle!

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