With NV231HD and NV241LD
GENERAL INFORMATIONThe NV231HD and NV241LD are part-time transfer cases with a low-range gear system. They provide 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.
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 knob.
TRANSFER CASE IDENTIFICATION
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 NV231HD and NV241LD transfer case models 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 NV231HD or NV241LD transfer cases. Use recommended lubricant only.
Approximate lubricant refill capacities are 1.5 to 2 liters (3 to 3.6 pints) for the NV231HD and 2.7 L (5.0 pints) for the NV241LD.
Correct fluid level for the transfer cases is to the bottom edge of the fill plug hole. Be sure that the vehicle is level when checking the fill level.