dart151bear251

Hi i am a new member and recently bought a landrover defender 110 e reg. I'm new to defenders and 4 x 4 vehicle and have recently had some drive issues. Was driving along when suddenly appeared to have come out of gear. With the vehicle in gear and releasing the cluth it would not drive. This happenes in hi and low range only way I can get the vehicle to move is in lower dif lock. Any ideas what might be the problem? Appears to only be engaging in rear wheel drive Any help greatly appreciated Thanks