Land Rover Defender: Component Location, Overview
COMPONENT LOCATION
COMPONENT LOCATION - 1 OF 1
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- Twin speed transfer case
OVERVIEW
The twin speed transfer case is full time, permanent all wheel drive unit, with 50/50 torque distribution to the front and rear driveshafts. The transfer case is identical for all engine derivatives and supports the following features:
- Permanent all wheel drive with a bevel gear center differential, providing a 50/50 torque split.
- Selectable high and low range for optimum on road and off road performance.
- A pre-loading function, increasing locking torque with increased driving torque.
- A slip controller to increase locking torque under off road conditions and decrease locking torque for optimum comfort, for example, during parking.
The twin speed transfer case is located under the vehicle and is installed on the cross member, behind the automatic transmission.
The input torque is equally distributed through a bevel gear center differential. The twin speed transfer case equipped with an electronically controlled locking and torque-biasing device. The twin speed transfer case can provide an optimal torque distribution to each wheel in all driving condition. Electronically controlled locking and torque-biasing device detects wheel slip through various vehicle system inputs to the Transfer Case Control Module (TCCM).
Electronically controlled locking and torque-biasing device locks the differential accordingly. The locking torque is applied through a multiplate clutch assembly.
A planetary gear set, located in the differential assembly, allows the driver to select high or low range. In low range, the planetary gear set provides a ratio of 2.93 : 1. Low range gives the vehicle an extremely low crawl speed for off road driving and trailer towing. High range is a direct drive from the transmission output shaft and provides a 1 : 1 ratio.
The oil used in the transfer case is specially developed and contains unique additives, which enhance the transfer case operation. No other oil must be used in the transfer case.
A unique type of grease, grease Weicon TL7391, must be applied to the transfer case input shaft spline when installing the transfer case.
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- Input shaft spline
READ NEXT:
Description
TRANSFER CASE EXPLODED VIEW
Synchronization spring (quantity 3)
Spring bracket
Multiplate clutch ( 10 friction plates, 10 steel plates)
Synchronization cup
Drum clutch
Plate clutch pack
Synch
Operation
High range operation
In high range, the torque output from the automatic transmission is passed to
the transfer case input shaft. The
position of the shifting sleeve couples the input shaft directly
Transfer Case - Diagnosis and Testing
DIAGNOSIS AND TESTING
PRINCIPLE OF OPERATION
For a detailed description of the transfer case system and operation, refer
to the relevant Description and Operation
section of the workshop manual.
INSP
SEE MORE:
Front Door
REMOVAL AND INSTALLATION
PART(S)
REMOVAL
CAUTION:
Protect the surrounding paintwork to avoid damage.
NOTES:
This procedure contains illustrations for left hand drive vehicles,
right hand drive vehicles are similar.
This procedure contains illustrations showing certain components
removed to p
Front/Rear Brake Hose
Front Brake Hose
REMOVAL AND INSTALLATION
GENERAL EQUIPMENT
PART(S)
REMOVAL
WARNING:
Fluid loss is unavoidable, use absorbent cloth or a container to collect the
fluid.
CAUTIONS:
If brake fluid is spilt on the paintwork, the affected area must be
immediately washed down with cold water.
Befo
