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Differential and Transfer Case


The differential, commonly known as the gear box, contains gears which connect your car's two axles. It consists of a drive pinion and ring gear to permit the rotation of two shafts at different speeds. Differential gears are part of the rear-axle assembly. They are used to convert the lengthwise flow of power from the engine through the clutches, transmissions, and propeller shafts into a right-angle direction. This change allows the engine power to turn the rear wheels (four wheel drive is used in some designs) and permits the wheels to move at different speeds, as when turning a corner.

The differential gears are submersed in differential fluid to protect the moving metal surfaces from friction and wear. Normal driving subjects the fluid to high temperatures which eventually break down the fluid. The result is metal to metal contact and extremely high heat that eventually prevents gears from turning the car's wheels.

The differential gears are submersed in differential fluid to protect the moving metal surfaces from friction and wear. Normal driving subjects the fluid to high temperatures which eventually break down the fluid. The result is metal to metal contact and extremely high heat that eventually prevents gears from turning the car's wheels. Proper differential fluid levels will reduce friction and wear and reduce shock and vibration. Checking these levels is part of M&J Oil & Lube's full service. For an additional cost, M&J Oil & Lube's offers a drain and refill service which includes: draining old differential fluid and replacing it with a high performance gear oil; lubrication that meets or exceeds manufacturers' specifications. Since 80 percent of motorists don't drive under ideal conditions, M&J Oil & Lube recommends changing your differential fluid every 30,000 miles. Consult your owner's manual for specific change intervals for your vehicle.