The transfer case provides power flow from the transmission to the front axle. The transfer case also disconnects the front axle in order to provide better fuel economy and quieter operation when the vehicle is driven on the roads where the four-wheel drive is not required. The transfer case provides an additional gear reduction when placed in low range. This is useful when difficult off-road conditions are encountered.

The New Venture Gear Model NV243 transfer case is used on all of the four-wheel drive vehicles under 9200 lb GVW.

The Model NV243 has an aluminum case, chain driven units with four modes of operation:

The gear reduction for low range is provided by a planetary gear set.

The New Venture Gear Model NV243 is electronically actuated. The vehicles equipped with this model have no transfer case selector lever. The operator selects 2HI, 4HI, or 4LO by pushing one of three switches mounted on the instrument panel. During normal driving the transfer case is in the 2HI mode. When the transfer case is in 2HI both the 4HI and the 4LO switch circuits are open, and both lights are OFF. When the four-wheel drive has been selected, the four-wheel drive indicator lamp on the switch turns on when the front axle has engaged. The lamp will blink while the front axle is engaging. For more information on the electrical operation of the NV243, refer to Transfer Case System Description .

When the transfer case is in the 2 WHEEL range, the torque flows from the input gear to the range shift hub and the main shaft, through the propeller shaft to the rear axle.

Important: Shifting into the 4HI range causes the following conditions to occur.

1. The front axle indicator lamp does not turn on until the front axle engages.
2. The torque flows from the input gear to the mainshaft the same as in the two-wheel position.

The shift linkage moves the mode synchronizer sleeve into engagement with the clutch teeth of the drive sprocket. This locks the drive sprocket to the mainshaft through the synchronizer sleeve.

3. The torque is transmitted through the drive sprocket and the drive chain to the driven sprocket and the output shaft. The torque then flows through the front propeller shaft to the front axle.
4. The shift mechanism in the transfer case closes the transfer case switch.

The current is then applied to the front axle electromechanical actuator and the front axle switch. In the K30 vehicles, the power is also supplied by the transfer case relay to the transfer case synchronizer.

5. The front axle shift mechanism, when fully engaged, closes a switch, causing the front axle indicator lamp to turn ON.

When the transfer case is shifted into the 4LO position, the torque flow and the operation is similar to the 4HI range, except that the range shift hub engages the planetary carrier. The planetary gear set then provides a gear reduction to the front and the rear axles.

For New Venture Gear Transfer Cases, an identification tag is attached to the rear case half. The tag provides the following information: