4LO Mode Power Flow
| Callout | Component Name |
|---|---|
| 1 | Transfer Case Input Shaft |
| 2 | Transfer Case Scissor Mechanism Lever |
| 3 | Transfer Case Four Wheel Drive Clutch |
| 4 | Transfer Case Front Output Shaft Drive Chain Assembly |
| 5 | Transfer Case Rear Output Shaft |
| 6 | Transfer Case Two/Four Wheel Drive Actuator Shaft Gear |
| 7 | Transfer Case Front Output Shaft |
| 8 | Transfer Case Two/Four Wheel Drive Actuator Cam |
When shifting the transfer case to the 4LO mode, it commands the 2/4 wheel drive actuator assembly to turn the control actuator shaft, to move the high/low shift fork (9). The shift fork (9) moves the high/low clutch (5), which is slip splined on the rear output shaft (6) toward the rear of the transfer case. The high/low clutch (5) outer teeth disengage from the input shaft (2) inner teeth. The high/low clutch (5) outer teeth then engage in the planetary carrier teeth. The power flow is now from the input shaft (2) planetary teeth to the planetary gears (3) in the carrier. Rotating the planetary gears (3), which are engaged in the high/low internal gear (4), the planetary carrier rotates. The planetary carrier engaged to the high/low clutch (5), drives the rear output shaft (6), providing a 2.72 reduction to the speed of the rear output shaft (6). The power flow to the front propshaft (8) is the same as it is in the 4HI.