PTU: a Different Kind of Transfer Case
The main design parameters for most late-model cars have been front-wheel drive (FWD) with transverse-mounted engines. This is a convenient packaging system for the manufacturer and has been for many years. The current trend of increased safety and performance has made many of the manufacturers add all-wheel drive (AWD), which sends power to the rear wheels for better traction and stability. The traditional transfer case, which divides power to the front and rear axles on vehicles with north/south engine placements, is unusable here.