You might want to have the front axle checked out.
Usually rotate the end cap clockwise until it stops
check vaccuum lines on cruise control and other things that use vac
Is there only high and low on the 2001 land rover discovery SD
Well, that would depend on the transmission. Sounds like you got yerself a 2wd mf-er.
Replace the thermal actuator in the front differential.
fwd
Fwd means forward.
FWD means Forward.
It's FWD.
Make sure your vehicle is in neutral before trying to engage the 4 wheel drive. If you hear the "clunk" of the transfer case engaging but there is no discernable difference in driving behavior, make sure the front hubs are locked.
blown fuse
Front Wheel Drive. ( FWD ).