Discovery Gearbox Interlock Assembly

Discovery Gearbox Interlock Assembly

Discovery vehicles with automatic transmissions are equipped with a transfer gearbox interlock solenoid which prevents the driver from moving the transfer gearbox lever from high to low or from low to high unless the automatic transmission is in neutral. In any event, gear changes should always be made at less than 5 mph (7 kph).

Shown below is the transfer gearbox interlock and related components used on Discoveries with automatic transmissions through 2003 model year.

Beginning with the 2004 model year, the range select interlock solenoid is moved to the shift lever housing.