Transfer Case Power Flow

WARNING: This page is about a different car, the 2003 Mazda B4000, 2002 Mazda B4000, 2002 Mazda B3000, 2001 Mazda B4000, and 2001 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.

The 13-54 mechanical version transfer case is a manually shifted, part-time 4WD unit. The Borg-Warner 13-54 shift transfer case provides LOW RANGE driving. In the 4X2 mode, torque from the transmission is transferred to the input shaft assembly, which in turn drives the rear output shaft that drives the rear axle assembly.

The 2W-4W shift is accomplished through the shifting of the lockup collar that engages the drive sprocket on the rear output shaft. The drive sprocket turns the drive chain which turns the driven sprocket on the front output shaft assembly. The front output shaft assembly then drives the front driveshaft.

The High-Low (H-L) shift is accomplished when the reduction fork assembly moves the reduction hub to engage the complete carrier assembly to the output shaft. Torque from the input shaft assembly is then transmitted through the sun gear which then turns the complete carrier assembly. The complete carrier assembly, now engaged to the output shaft, provides the reduction. The unit is lubricated by a gerotor oil pump assembly that pumps the oil through the bore in the rear output shaft.

Models equipped with mechanically controlled transfer cases may be towed with transfer case in Neutral without disconnecting rear drive shaft. Models equipped with electronically controlled transfer cases must have rear drive shaft disconnected, since Neutral is not available, and transmission damage may result.