DISCOVERY 4 - WE TESTING BEFORE PURCHASE. Gearbox Transfer Shift Control Module for Land Rover LR4 and Discovery 4 models from the 2010-2016 model years. This electronic module controls the gear selection for the transfer case, allowing the vehicle to switch between different drive modes and gear ratios. It is a direct replacement for the original part, designed to resolve issues like difficult or incorrect gear shifting and ensure smooth operation of the vehicle's drivetrain. #landrover #disco4