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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.
Proper differential fluid levels will reduce
friction and wear and reduce shock and vibration.
Checking these levels is part of Jiffy Lube's full
service. For an additional cost, Jiffy Lube offers a
drain and refill service which includes: draining
old differential fluid and replacing it with high
performance gear oil; lubrication that meets or
exceeds manufacturers' specifications. Since 80
percent of motorists don't drive under ideal
conditions, Jiffy Lube recommends changing your
differential fluid every 30,000 miles. Consult your
owner's manual for specific change intervals for
your vehicle. |
