Rear output housing (Transfer box - LT230SE)

Functionality – Vehicles from 03 model year only The differential lock must be engaged for 2 wheel rolling road testing. It will also be necessary to disconnect the propeller shaft from the transfer box output shaft driving the axle whose wheels are NOT on the rolling road. In addition, the ETC system must be deactivated by either, removing a fuse (10A fuse 28 in the passenger compartment fusebox, labelled ABS) or disconnecting the ABS modulator pump. This must be done with the ignition switched off. Note that the SLABS ECU may record a system fault.

The lock can be engaged or disengaged using the selector lever. Vehicles not fitted with a differential lock can be identified by a high/low range selector lever with no differential lock functionality and the cover and selector shaft (arrowed), not visible on the front output housing.

WARNING: VEHICLES NOT FITTED WITH A DIFFERENTIAL LOCK MUST NOT BE TESTED ON A ROLLING ROAD WHERE THE ROLLERS ARE DRIVEN BY THE VEHICLE.

Differential lock warning lamp switch - if fitted - Vehicles up to 03 model year A differential lock warning lamp switch connected to the SLABS ECU and operated by movement of the selector fork and shaft is screwed into the top of the output housing. The switch connects to earth when the differential lock is engaged.

Differential lock warning lamp switches - if fitted - Vehicles from 03 model year Vehicles from 03 model year are fitted with two differential lock warning lamp switches.

One switch is of a new design and is fitted into the top of the front output housing in the same position as on previous models. The switch is connected to the SLABS ECU and is operated by movement of the selector fork and shaft.

The second switch is located in a threaded hole on the forward face of the front output housing. The switch is also connected to the SLABS ECU and is operated by movement of the selector shaft.

Both switches have an aluminium washer which seals the switch to the casing and also sets the switch position, removing the requirement for a setting procedure.

Both switches are connected in parallel to earth when the differential lock is engaged. This earth is sensed by the SLABS ECU which illuminates the differential lock warning lamp in the instrument pack.

Differential lock warning lamp - Vehicles up to 03 model year – if fitted The differential lock warning lamp is located in the instrument pack and provides a warning to the driver when the ignition is switched on that the differential lock is engaged. The warning lamp illuminates in a Red colour.

With the lock engaged, the traction control and electronic brake distribution warning lamps will also be illuminated. Disengagement of the differential lock should be carried out with the ignition switched off. The warning lamps must be extinguished when the ignition is switched on again.

Differential lock warning lamp – vehicles from 03 model year – if fitted The differential lock warning lamp is located in the instrument pack and provides a visual warning to the driver, when the ignition is on, the differential lock is engaged. The warning lamp illuminates in an amber colour.

When the lock is engaged, the warning lamp is illuminated and the instrument pack sounder emits three audible chimes. When the lock is disengaged, the warning lamp is extinguished and the instrument pack sounder emits three audible chimes.

Rear output housing

The rear output housing carries the output shaft and flange. A cable operated transmission brake is attached to the housing, the brake drum being attached to the output flange.

The rear output shaft is supported in the housing by a single bearing and is splined into the differential rear sun gear.