4401 Transfer Case
The Bargainers 4401 transfer case is a chain driven, four-position unit. It provides the following ranges:
| • | A four-wheel drive high range |
| • | A four-wheel drive low range |
| • | A two-wheel high range |
| • | A neutral position |
The BW4401 is a part-time four-wheel drive unit.
Torque input in four-wheel drive is undifferentiated.
The range positions are selected by a floor-mounted gear shift lever.
The unit has a gear reduction ratio of 2.69:1.
The BW4401 has a three piece aluminum case. The case has provisions for a power take off (PTO). The BW4401 uses an electric synchronizer when shifting into a four-wheel drive.
Identification
An aluminum identification tag is attached to the rear half of the transfer case, under the self-tapping extension housing bolts. The tag provides the following information:
| • | The transfer case model number |
| • | The serial number |
| • | The build date |
The information on this tag is necessary for servicing the transfer case. If the tag is removed or becomes dislodged during service operations, keep the identification tag with the unit.
Power Flow
Input torque is transmitted to the transfer case gear train through the transfer case input gear. This transfer occurs in all drive range positions.
Torque transmission in 2HI range occurs as follows:
| • | Torque is transmitted from the input gear to the range shift hub and the mainshaft. |
| • | Torque flow continues through the slip/fixed yoke. (The slip yoke is splined to the mainshaft.) |
| • | Torque flow continues to the rear propeller shaft and axle. |
In the 2HI range, the mode synchronizer remains in the neutral position and does not lock the drive sprocket to the mainshaft. As a result, torque is not transferred to the driven sprocket.
Torque transmission from the input gear to the mainshaft is the same in the 4HI range. However, in the 4HI position, the mode synchronizer sleeve is shifted into engagement with the clutch hub teeth on the mainshaft. This locks the drive sprocket to the mainshaft through the synchronizer assembly. The drive chain then transmits the torque through the drive sprocket. Since the front output shaft is splined to the driven sprocket, torque flows through the output shaft to the front propeller shaft and axle. This results in high range four-wheel drive.
In the 4LO range, the range shift hub is shifted into engagement with the planetary carrier. This causes the input gear to rotate the planetary pinions inside the fixed annulus gear. The planetary carrier, range shift hub, and mainshaft rotate at a gear reduction ratio of 2.69:1.
