2WD Mode Power Flow
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Callouts in the following chart represent components shown in graphic above.
| 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 Two/Four Wheel Drive Actuator Cam |
| 8 | Transfer Case Front Output Shaft |
When the ATC is in the 2WD mode, the power flows from the transmission (1) to the input shaft (2). The input shaft (2) is connected to the rear output shaft (4) by the high/low clutch (3). The high/low clutch (3) outer teeth are engaged with the input shaft (2) inner, high-speed position teeth. At the same time the high/low clutch is slip splined to the rear output shaft (4). The rear output shaft (4) delivers the power flow to the rear propshaft (5). The position of the control actuator shaft (7) allows no clutch (6) engagement. The high/low range shift fork (8), is in the high-speed position on the control actuator shaft (7).