This mode is seamless for the driver, requiring no input or action from the operator, and is suitable for driving on dry pavement. The 4×4 auto mode allows the TCCM to send power to the front wheels when the wheel-speed sensors show a difference in wheel speed, until the wheel speeds equalize and then the clutch pack unloads returning the vehicle to a 2WD with the power being transferred to the rear wheels. The 4×2 mode allows operation in two-wheel drive with no power going to the front wheels. 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).Įxploring the operation of the single-speed Navigator unit, we find that the operator can select using-mode selector buttons for three operational modes: 4×2, 4×4 auto, and 4×4. 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. 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 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. Seems simple enough but there are two models of the 4417, which can be an issue in diagnostics and obtaining parts or reman units. Issue: Simple assemblies, complex systemsįrom 2008 to present, Lincoln Navigator, Expedition and Ford F-150 pickup have come with the BorgWarner 4417 transfer case.
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