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For posterity;
Workshop Manual
DESCRIPTION AND OPERATION
Electronic Shift Operation
The transfer case (7A195) is equipped with a magnetic clutch, similar to an air conditioning compressor clutch, which is located inside the transfer case adjacent to the lockup collar. The clutch is used to spin up the front drive system from zero to vehicle speed in milliseconds. This spin-up allows the shift between 2-high and 4-high to be made at vehicle speeds listed in the vehicle owner's guide. The spin up engages the front locking hubs. When the transfer case rear and front output shafts reach synchronous speed, the spring-loaded lockup collar mechanically engages the mainshaft hub to the chain drive sprocket and the magnetic clutch is then deactivated. Shifts between 4-high and 4-low can only occur with the transmission safety switches closed. The vehicle's speed must also be within specified limits as determined by the transfer case speed sensor (3 mph or under).
Electronic Shift Control System
This system consists of a two-switch control system, an electronic control module, an electric shift motor with an integral shift position sensor, and a speed sensor.
Switch Control System
There are two control switches located on the upper right corner of the instrument panel for fingertip shift control. The two switches are mounted horizontally and are identified as "4x4" and "LOW RANGE." Two indicator bar lamps are located in the instrument cluster.
When either of the two switches on the instrument panel control are depressed, the first thing that happens is that the electronic control module receives input from the transfer case shift position sensor to verify what position the transfer case is in (2H, 4H or 4L). Next, the electronic control module looks at the speed sensor and the park/neutral position switch or clutch pedal position switch (depending on transmission type). If all conditions are correct to allow the desired shift, the electronic control module will tell the electric shift motor to execute the shift. After the shift has been made and the electric shift motor is off, the control module again looks at the shift position sensor to make sure the proper shift has been accomplished. Finally, the dash indicator light and the push-button light on the control panel will be illuminated by a signal from the electronic control module indicating the desired function has been completed.
In Diagram c11461b below;
7017 Input Shaft
2 7A398 Front Planet
3 7100 High-Low Collar
4 7177 Sprocket, Drive
5 7G361 Electromagnetic Clutch
6 7106 Lockup Sleeve
7 7D126 Lockup Spring
8 7061 Output and Fifth Gear Drive Shaft, Rear
9 7289 Shift Fork, 4WD
10 7219 Lockup Release Spring
11 7G360 Transfer Case Shift Motor
12 7A029 Drive Chain
13 7061 Output and Fifth Gear Drive Shaft, Front
14 3B396 Hub, Auto Locking
15 7N095 Shift Shaft
16 7W074 Range Shift Spring
17 7289 Shift Fork, Range
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Electronic Control Module
The electronic control module, located on the passenger side, controls the operation of the transfer case in response to inputs to the push-button control by the vehicle operator, the speed sensor, shift position sensor and the park/neutral position switch.
Speed Sensor
The speed sensor, mounted on the rear of the transfer case, tells the electronic control module the speed of the vehicle to allow range shifts (in or out of 4L) to occur.
Shift Position Sensor
The shift position sensor, an integral part of the electric shift motor, tells the electronic control module the shift position of the transfer case.
Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary helical cam which moves the 2W-4W shift fork and 4H-4L reduction shift fork to the selected vehicle drive position.
Borg-Warner 13-56 Electronic Shift Transfer Case
Item Part Number Description
1 7A039 Extension Housing
2 7B214 To Rear Axle
3 7A195 Transfer Case
4 7E063 Skid Plate
5 7B214 To Front Axle
6 7G360 Transfer Case Shift Motor
7 � Wiring Connector Mounting Bracket (Part of 7G360)
8 � Shift Position Sensor
(Part of 7G360)
9 87675 Fill Plug
10 7B214 Case Yoke
11 7F239 Speed Sensor
12 � Wiring Harness Connector
(Part of 7G360)
13 87675 Drain Plug
NOTE: Remember that electronic shift transfer cases do not have a selectable neutral position. Because of this, if vehicles equipped with electronic shift are to be towed for long distances, the rear driveshaft should be disconnected. If this is not done, the transfer case (which is protected by positive lubrication) will drive the transmission, which is not lubricated when the vehicle is towed, and may cause damage to the transmission.
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