No central differential lock
Hi,
your 2001 model probably does not have a CDL (central diff lock) you can tell if it does as the low range selector will also have cdl emgagment option. fitting a CDL will greatly improve off road capability especialy in soft sand. Without the CDL you are relieing on traction control which doesnt work well in sand. As well as the CDl you will need the lever cable and plate that fits under the centre console.
Take it to another landy mechanic, usual cost around $400 to $500 to fit a new T/fer case. Make sure it checked out and replace thrust washers and do the rear bush if required. My new t/fer had only done very low k's and did not require any work.
Mike