These cannot be driven like any old 4x4 off road.
The traction control system will act like you have locked diffs front and rear (unless something is wrong), i can vouch for this as I have used my extensively off road.
The pre tdv8 models, 2002 to 2008 have the NV225 transfer case that used a mechanical torsen type LSD....so no centre lock what so ever.
They utilize the traction control system to apply brakes to the wheels without traction, so riding the brakes will only turn off the system and allow the wheels to spin. A steady low application of the accelerator is the best way and I can assure you it will drive all wheels the same speed. It will even go further and twist a drive shaft in half if you attempt to use a "ladder winch" and have 3 wheels with zero traction ...we dont talk about that, it was a long long day.
generally the first instinct when wheel spin happens in a 4x4 is to back off the throttle, just keep it rolled on gently and let the computer take over.
the DSC should be switched off soon as u go off road, it will sense the wheel spin and reduce engine power it attempt to stop the queen spinning out when she puts the foot down around a corner.
Ive been using my 2006 TD6 for the last 5 years off road and have only ever had one need for a centre diff lock, that was when i broke a shaft doing something i shouldnt have. I have had many of wheels lift up and the other 3 kept on pulling just fine so if you still think something is wrong best bet is to get yourself an IID tool and see what codes come up. its call controlled by the ABS computer from my understanding.
Good luck, and remember, this thing is isnt your normal 4x4 its designed to be better.
