General

TRANSFER BOX

41-6

DESCRIPTION AND OPERATION

Description

General
The NV225 Transfer Box is a full time, permanent four wheel drive, torque splitting transmission with equal torque 
distribution to the front and rear propeller shafts. The transfer box has the following features:

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Permanent four wheel drive with 50/50 torque split

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Two speed, fully synchronised 'shift on the move' system with electronic control and operation

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High range direct drive and low range via epicyclic gearset

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Torsen® Type B torque sensing and torque biasing centre differential

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Self lubricating oil pump system.

The transfer box is located under the vehicle in a subframe, behind the transmission. The units used on both the Td6 
and V8 variants are identical, with the exception of the large mounting bush. The transfer box is manufactured by New 
Venture Gear in Roitzsch, Germany.

The transfer box receives an input from the transmission output shaft which is passed through the unit to two outputs 
for the front and rear propeller shafts.

The transfer box provides full time four wheel drive via a 50:50 torque sensing Torsen® differential. The unit design 
allows “shift on the move” from high to low range and visa versa. A planetary gearset with helical planetary pinion 
gears provides low range operation. When in low range, the planetary gearset provides a ratio of 2.69:1 which gives 
the vehicle an extremely low, low range crawl speed. High range is a direct drive from the transmission output shaft 
and provides a 1:1 ratio.

The transfer box has electronic control, via a PWM actuator (DC motor), on the shift from high to low range. The 
actuator is controlled by a transfer box ECU, which is located behind the battery in the engine compartment.