Mine is an 03. I知 not the most mechanically inclined but with the use of the forums I値l try to do it myself and document the process even though it痴 already been done , I just need to find a good linkage i found that two junyards have full cases so I知 going to call and see what they want for the linkages

 

'ere you go mate... www.discovery2.co.uk/Factory Diff Lock

 

That's the link I followed when I did mine, It's done well. If you shop it, you'll find 04' linkage with all the accessories eventually. You can always do the SLABS later, I still haven't done mine! You just need to remember to take the TC out of lock before you shut the car off so you don't have the 3 amigos when you restart.

 

On an 03 = you DO NOT have to touch anything regarding the SLABS Unit (03-04 SLABS Unit fully support CDL operation). 99-02 SLABS require the modification to the wiring or by installing an 03-04 SLABS Unit.

I have seen some 03’s without the wiring down at the TC end for the CDL switch. In that case you’d have to either grab the 04’s harness or run your own pair of wires from the SLABS Unit to the TC.

 

This is the main reason to upgrade to the 04 SLABS unit, you can leave the diff locked and no 3 amigos on restart. Allegedly better TC programming too. If you're already grabbing the CDL linkage off an 04, get the SLABS unit too if you can. And the transfer case harness like Best said above.