If you have four-wheel-drive or all-wheel drive in your vehicle, the transfer box is going to be part of the drivetrain. Its role is to transfer power between the axles to help the vehicle get maximum traction on wet, snowy or icy roads. Depending on a vehicle's design, power may be distributed automatically or manually.
The transfer case may either be considered married or divorced from the transmission itself. Married transfer cases are bolted or otherwise secured right to the transmission while a divorced case is placed elsewhere along the drivetrain. Independent transfer cases...