| 摘要 |
A transfer case for a four wheel drive vehicle providing a drive range planetary gear set selectively positionable at a low speed output position, a high speed output position and a neutral position; having a dual planetary inter-axle differential gear set axially spaced from the range planetary gear set. The differential gear set is selectively positionable to provide a two-wheel drive mode to a first output and a full-time four-wheel drive mode with differential action between the first output and a second output. A viscous fluid clutch is selectively connected between the first and second outputs for modifying torque division therebetween whereby the viscous clutch is disconnected upon shifting into the two-wheel drive mode.
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