Is your 4WD Toyota Tacoma or 4Runner (2015-2020 models) having trouble shifting into 4WD, or is the 4WD light flashing? A faulty transfer case actuator is a common culprit. This FIWARY replacement part is designed to match the original Toyota part numbers 36410-0K020, 36410-0K010, and 36410-71010. The actuator is the electric motor that engages the front wheels when you switch into 4WD. This is a brand new, aftermarket unit that should restore proper 4WD function. It comes with a 3-month warranty. Installation requires some mechanical knowledge, as it's mounted on the transfer case. Before you buy, double-check that the part number and the picture match the actuator on your vehicle. Replacing this can save you a costly trip to the dealership and get your 4x4 working reliably again.