BorgWarner 4417 Transfer Case: 2 for the Price of One
From 2008 to present, Lincoln Navigator, Expedition and Ford F-150 pickup have come with the BorgWarner 4417 transfer case. Seems simple enough but there are two models of the 4417, which can be an issue in diagnostics and obtaining parts or reman units. The Navigator is equipped with a single-speed transfer case, while the Expedition and F-150 are equipped with a 2-speed T-case, although both are 4417 models. The quick and easy way to identify what you see is to look for an electronic shift motor, which will be the 2-speed unit. The single speed unit will only have an electronic connector to operate the electronic clutch and is basically an all-wheel-drive unit that has no low-range mode. Both units are Torque on Demand (TOD), which uses computer control to apply the internal clutch pack to send power to the front wheels as commanded by the computer (Transfer Case Control Module or TCCM).
