Yes I did verify that the diff is not locked.

I also went near the beach for a bit beach sand off roading and I Locked the diff and Unlocked it quite easily and almost straight away.

The Oil been in that transfare box quite a long time, maybe over a year and a half, and I was planning to change it very soon like next week or so.
Does the transfare box require a specific Oil or any trans Oil will do??

How hard it is to check those detection switches???
Because Some one at the dealer told me that they are not accessable unless the transmissin and the tarns-box are dropped? is that true??? Cuz honestly I don't belive in the dealer

Thanks alot for your input