Snow Driving Questions

[Nickleahy23]

for the last 2 winters ive had the tahoe, only time i will use auto is if im on the interstate and its snowing, but not enough to need 4x4 the whole way...if theres 2-3" on the ground, ill just throw it in 4x4 and go..ive had it in 4x4 for the last 2 weeks since they dont plow shit around campus..no harm done

 

[andrew383]

The workings of the GM autotrac transfer case

In the 4HI mode, the power flow to the rear propshaft (10) is the same as it is in the 2HI mode. To deliver power flow to the front propshaft (13) during the 4HI position, the transfer control module commands the encoder motor (15) to apply the clutch to a calibrated torque. The encoder motor (15) turns the control actuator lever shaft (14). A brake in the encoder motor (15) holds the control actuator lever shaft (14) in the full clutch position. The control actuator lever shaft (14) is cam designed and the cam action moves the clutch lever (4). The clutch lever (4) pivots on the clutch lever pivot studs and moves toward the clutch apply plate, to engage the clutch. As more pressure is applied to the clutch apply plate, the clutch discs are compressed. Using inner clutch discs, which are engaged with the clutch hub (5), and the outer clutch discs, which are engaged with the clutch housing (6), the power flow is delivered to the clutch housing (6). The clutch hub (5) is splined to the rear output shaft (9), and the clutch housing (6) rotates on a needle bearing on the rear output shaft (9). The chain drive sprocket (7) is splined to the clutch housing (6). The power flows from the drive sprocket (7), through the chain (11), to the chain driven sprocket. The driven sprocket is splined to the front output shaft (12). The power flow is delivered to the front propshaft (13) through the front output shaft (12).

During the Auto 4WD mode, the power flow is the same as it is in the 4HI mode. Except, during the Auto 4WD mode, the encoder motor (15) rotates the control actuator shaft lever (14) to the correct torque level positions. Rotating the control actuator (14) to the various positions changes the clutch torque level. When a difference of front propshaft (13) to rear propshaft (10) speed is recognized, the transfer case control modules command for more, or less clutch torque.

 

[TahoeZO6]

How come there is no "4LO" in our Tahoes? (2010 Model for me.) If there is, I sure as hell don't see it??? Am I blind?

On my previous Explorer, (new body style), It had AUTO, 4HI AND 4LO on the knob, on my Tahoe, I have RWD/2^, AUTO, 4^.

Thank you to Steve and everyone else with the knowledgable answers. I'm still learning about 4x4 as I am used to Full Time AWD like in my Audi S4, (Quattro).

Justin

 

[AquinoSteven]

Im pretty sure 4lo was an extra option on the new trucks

 

[rjpeaks]

The workings of the GM autotrac transfer case

In the 4HI mode, the power flow to the rear propshaft (10) is the same as it is in the 2HI mode. To deliver power flow to the front propshaft (13) during the 4HI position, the transfer control module commands the encoder motor (15) to apply the clutch to a calibrated torque. The encoder motor (15) turns the control actuator lever shaft (14). A brake in the encoder motor (15) holds the control actuator lever shaft (14) in the full clutch position. The control actuator lever shaft (14) is cam designed and the cam action moves the clutch lever (4). The clutch lever (4) pivots on the clutch lever pivot studs and moves toward the clutch apply plate, to engage the clutch. As more pressure is applied to the clutch apply plate, the clutch discs are compressed. Using inner clutch discs, which are engaged with the clutch hub (5), and the outer clutch discs, which are engaged with the clutch housing (6), the power flow is delivered to the clutch housing (6). The clutch hub (5) is splined to the rear output shaft (9), and the clutch housing (6) rotates on a needle bearing on the rear output shaft (9). The chain drive sprocket (7) is splined to the clutch housing (6). The power flows from the drive sprocket (7), through the chain (11), to the chain driven sprocket. The driven sprocket is splined to the front output shaft (12). The power flow is delivered to the front propshaft (13) through the front output shaft (12).

During the Auto 4WD mode, the power flow is the same as it is in the 4HI mode. Except, during the Auto 4WD mode, the encoder motor (15) rotates the control actuator shaft lever (14) to the correct torque level positions. Rotating the control actuator (14) to the various positions changes the clutch torque level. When a difference of front propshaft (13) to rear propshaft (10) speed is recognized, the transfer case control modules command for more, or less clutch torque.

wow.

 

[doubletapdrew]

Im pretty sure 4lo was an extra option on the new trucks

Yep the standard transfer case is a single speed with no neutral position. The two-speed transfer case with neutral and 4lo was an option.

 

[TahoeZO6]

Yep the standard transfer case is a single speed with no neutral position. The two-speed transfer case with neutral and 4lo was an option.

Thanks, but, I have the two speed transfer case, well at least according to my paperwork I do. Neither on chevy.com or at my dealership was 4LO even an option listed anywhere.

Any ideas? Would a picture on my console help? I REALLY NEED a 4LO for my off road adventures.

O.T., but my 2004.5 Explorer XLT was an awesome truck. It did everything great and it handled everything and anything I threw at it. There was NOTHING that could stop that truck.

Is the Tahoe the same way, especially in snow? I know tires make a big difference, but I am talking about the truck itself.


Thanks again!!