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Driveshaft
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Shaft connecting the transmission output shaft to the differential drive pinion shaft. Four-wheel-drive vehicles add a second driveshaft from the transfer case to the front differential.
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Four Wheel Drive
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A drivetrain that utilizes a transfer case to distribute engine power between the front and rear axles in order to drive all four wheels. Full-time four-wheel-drive systems utilize a center... Read More
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Front Axle Disconnect
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A mechanical or vacuum-operated component used primarily on four-wheel-drive models to connect and disconnect drive torque to the front axle. When shifting from four-wheel drive to two-wheel drive,... Read More
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Gerotor Coupling
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A speed-sensing component used in four-wheel-drive systems, which includes a fluid pump, a piston and a set of clutch plates. When a speed difference occurs between the front and rear driveshafts of... Read More
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High Descent Control
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This system uses the ABS braking to control the car's motion downhill. Also allows a smooth and controlled hill descent in rough terrain without the driver needing to touch the brake pedal. If the... Read More
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High-Range
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A 4WD mode used for on-road or light off-road use.
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Jounce
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This system uses the ABS braking to control the car's motion downhill. Also allows a smooth and controlled hill descent in rough terrain without the driver needing to touch the brake pedal. If the... Read More
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Limited-Slip Differential
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Provides the same basic functions as an axle differential, but with an added advantage: when the drive wheel begins spinning as a result of being on a slippery surface, a limited-slip differential... Read More
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Locking Differential
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Provides even more traction than a limited-slip differential by “locking” the axle shafts together when the driver wants to do it. Locking differentials do not allow for wheel-speed differences and... Read More
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Low-Range
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A 4WD mode used for severe off-road conditions.
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Neutral
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When the shifter is in this position, the front and rear axles spin freely. Sometimes used for towing a Jeep vehicle behind another vehicle (such as a motor home), so that uncoupling the driveshafts... Read More
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Open-Center Differential
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Located in the transfer case on some full-time four-wheel-drive vehicles, this component works in the same way as an open differential in the axles, but is of a more compact design. This component... Read More
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Progressive Axle
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Progressive front and rear axles transfer torque side to side in search of the wheel with the greater traction. This mechanical (gerotor pump) system transfers torque relative to differences in wheel... Read More
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Rock-Trac
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Wrangler's super-tough, Rock-Trac(R) part-time 4WD system includes Tru-Lok(R) front and rear lockers and a super-slow 4:1 gear ratio. A 4:1 low-gear allows Wrangler to crawl at lower speed for... Read More
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Shift-on-the-Fly
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The ability to shift from two-wheel drive to four-wheel drive while the vehicle is moving.
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Skid Plate
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A skid plate is a steel plate affixed to the underside of a vehicle to prevent damage to key components in the undercarriage. Skid plates are most frequently found on four-wheel drive vehicles... Read More
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Swaybar
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A sway bar (also stabilizer bar, anti-sway bar, roll bar, or anti-roll bar, ARB) is an automobile suspension device. It connects opposite (left/right) wheels together through short lever arms linked... Read More
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Throttle body spacer
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A throttle body spacer is designed to improve the quality of the airflow, allowing air that is more condensed and, thus, more oxygen laden, to enter the combustion chamber. The result of this is a... Read More
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Throttle position sensor
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A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can... Read More
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Tow Hooks
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Heavy-duty forged steel hooks in the front and rear of a vehicle that provide attachment points for snatch-em straps and winch cables should you get stuck.
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