Transfer Case: Description and Operation

GENERAL INFORMATION
The NV241HD is a part-time transfer case with a low-range gear system. The transfer case provides three operating ranges plus a Neutral position. The low range position provides a gear reduction ratio of 2.72:1 for increased low speed torque capability. Operating ranges are: 2-high, 4-high and 4-low.

The gear cases, retainer and extension are all of aluminum. Drive sprockets and an interconnecting drive chain are used to transmit engine torque to the front/rear propeller shafts. The mainshaft, input gear and front output shaft are supported by ball and needle bearings.

NV241HD Transfer Case:

The synchro mechanism consists of a brass stop ring, synchro hub with 3 struts and 2 retaining springs and the sliding clutch. The synchro components allow the transfer case to be shifted between 2H and 4H ranges while the vehicle is in motion. However, the vehicle must be stopped in order to shift into 4L range.

OPERATING RANGES
Transfer case operating ranges are:
- 4x2 (2-wheel drive)
- 4x4 (4-wheel drive)
- 4 Lo (4-wheel drive low range

The 4x2 range is for use on any road surface at any time.

The 4x4 and 4 Lo ranges are for off road use only. They are not for use on hard surface roads. The only exception being when the road surface is covered by ice and snow.

The low range reduction gear system is operative in 4 Lo range only. This range is for extra pulling power in off road situations. Low range reduction ratio is 2.72:1.

A front axle disconnect system is used to achieve two-wheel. drive mode. The axle disconnect vacuum motor is actuated by a vacuum switch on the transfer case. The, switch is operated by the transfer case range rod.

SHIFT MECHANISM
The transfer case is operated by an adjustable floor mounted shift linkage. The transfer case shift lever is directly attached to the shift sector. The sector operates the range and mode forks within the transfer case.

A straight line shift pattern is used with a neutral detent. Lever range positions are imprinted in the shift knot).

PTO CAPABILITY
The NV241HD transfer case has POWER TAKE-OFF (PTO) capability. A PTO gear permanently attached to the planetary carrier, and a removable PTO cover are provided for this purpose.

TRANSFER CASE IDENTIFICATION

Transfer Case Identification Tag-Typical:

An identification tag is attached to the rear case of every transfer case. The tag provides the transfer case model number, assembly number, serial number, and low range ratio.

The transfer case serial number also represents the date of build.

RECOMMENDED LUBRICANT AND FILL LEVEL
Recommended lubricant for the NV241HD transfer case is MOPAR Dexron II, or ATF Plus. Use this fluid for topping off the level, refilling after service, or normal fluid changes.

Do not use anti-friction additives or similar products in the NV241HD transfer case. Use recommended lubricant only.

Approximate lubricant refill capacity is 3.1 liters (6.5 pints) for the NV24111D.

Correct fluid level for the transfer case is to the bottom edge of the fill plug hole. Be sure that the vehicle is level when checking the fill level.