Chances are if you are reading this you bought a used Series One Land Rover Discovery and have spent countless hours reading your owner’s manual, searching the web for answers, and trying every combination of transmission in drive, transmission in neutral, going over 5 M.P.H. going under 5 M.P.H., emergency brake on, etc. and you have finally come to the conclusion that your differential lock is thoroughly stuck. This page will hopefully provide you with guidance into fixing this common problem on Land Rover Discoveries.