transfer case question

[typhoon186]

What if anything is rotating in the transfer case when in 2WD?

[hoitzed]

yes

[newdude]

Two Speed Transfer Case:

 

2WD Mode Power Flow

 

(1)Transfer Case Input Shaft

(2)Transfer Case Scissor Mechanism Lever

(3)Transfer Case Four Wheel Drive Clutch Pack

(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

2WD Mode Power Flow
 

When the MP 3025 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).

 

Single Speed Transfer Case:

 

2WD Mode Power Flow

 

(1)Transfer Case Input Shaft

(2)Transfer Case Scissor Mechanism Lever

(3)Transfer Case Four Wheel Drive Clutch Pack

(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 the MP 3015 ATC is in the 2WD mode, the power flows from the transmission (1) to the input shaft (2). The input shaft (2) is splined to the rear output shaft (3). The rear output shaft (3) delivers the power flow to the rear propshaft (4). The position of the control actuator shaft (6) allows no clutch (5) engagement.

[AJMBLAZER]

It's also not uncommon for the front driveshaft to sympathetically spin due to the fluid whirling around in the transfer case.

[typhoon186]

Thanks.  I expected there was still a lot going on even when not in 4WD.