Jeep Transfer Case Np231 Service Manual

Transmission and Drivetrain Parts for Jeep Wrangler

The 2002 jeep liberty transfer case and the 2007 jeep liberty transfer case utilize the NP231 transfer case. The best way to prevent problems is to check your fluids regularly. The transfer case requires separate fluid from the transmission.

Drivetrain and transmission parts are available for routine maintenance work needed by Jeep Wrangler models and motors. Transmission parts include those related to gear shifting. Drivetrain parts cover the energy transfer system that transmits the engine's power to the Wrangler's wheels.

What is a transmission?

The function of the Jeep Wrangler's transmission is to control the ratio of engine power that reaches its axles. Just as shifting on a bicycle helps the rider change the amount of energy going to the wheels, the transmission increases or decreases the amount of the engine's power that reaches the wheels depending on the situation, such as when the driver accelerates, decelerates, or drives uphill.

How does a manual transmission work?

Manual transmissions leave the gear-shifting decisions to the driver. Shifting is accomplished with a foot pedal called a clutch and a manual shifter. The clutch momentarily disconnects the transmission from the engine during shifting. Once the shifting is done, the driver releases the clutch to re-engage the transmission.

What is a drivetrain?

The Jeep Wrangler's drivetrain is a system that controls the amount of energy that goes to each axle and wheel. This is a complex system in four-wheel-drive vehicles like the Wrangler that gives the driver more control in difficult conditions. It adjusts how much power each wheel applies to the road depending on how much traction it has in real time. When a wheel loses traction, the system distributes some of its energy to the other wheels so that it isn't wasted on a spinning tire.

ManualJeep Transfer Case Np231 Service ManualWhat are some important parts of a transmission?

There are many transmission parts because of the complex mechanisms used to shift and maintain a connection with the engine without a physical linkage. Below is a quick overview of some of the important parts of the Jeep Wrangler's transmission.

  • Pump: Placed between a torque converter and a planetary gear set, the pump moves transmission fluid back to the torque converter.
  • Torque converter: The converter sits behind the engine and acts as the coupling with the transmission. It uses a stator, impeller, and turbine to produce transmission fluid pressure from the power provided by the engine.
  • Planetary gear set: This consists of a sun gear, planet gears, and a ring gear, which work together to create the ratios used by the transmission. They control how much rotational force is applied to the driveshaft.
What are some drivetrain parts that often need maintenance?

The drivetrain will often develop problems at the joints between the driveshaft and axle shafts. The driveshaft connects to a transfer case on each of the Jeep Wrangler's axles. Inside of each transfer case is a U-joint, which allows the driveshaft and axles to turn simultaneously. There are also constant velocity joints that maintain a consistent speed during turns. Axle shafts are also weak points that can wear out or break.

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