Borg Warner Torque Transfer Systems is one of the largest manufacturers of domestic transfer cases. Borg Warner cases are primarily installed in Ford trucks and SUVs; however, a few GMC/Chevrolet models feature them as well.
The best way to identify your transfer case is to use the ID plate. Borg Warner ID plates are rectangular, metal tags that are bolted to the case. The tag will identify the model number, the part number and the unit serial number. All Borg Warner cases begin with "BW."
The BW1345F was used in the F-250 from 1980 to 1992. The BW1350F was used in Broncos, Rangers and Explorers from 1983 to 1989. The BW1356F was used in Broncos, F-150s and F-250s from 1987 to 1996. The BW4404F was used in Explorers and Mountaineers after 1996 and the BW4405F from 1995 to 1999. The BW4406F was used in F-150s, F-250s, Expeditions and Navigators after 1997. The BW4407F was used in F-250s and F-350s from 1996 to 1998.
The GMC K3500 truck utilized the two-piece BW4401C (after 1988) and the three-piece BW1370C (after 1989). The Chevy Astrovan, Safari, Bravado, Typhoon and Cyclone used the BW4472C from 1991 to 1998.
