If you really want HD pack the easiest and cheapest way ( both short and long-term) would be to trade your LR4 in and get the the one you want. I think someone tried to retrofit just a rear locker on 2010- 2013 models and it was a difficult job.
All V8 LR4s ( 2010-2013) do well even without a rear locker. Low range and traction control do the magic. Unfortunatelly 2014+ cars without HD package are useless once there is no "pavement".
All V8 LR4s ( 2010-2013) do well even without a rear locker. Low range and traction control do the magic. Unfortunatelly 2014+ cars without HD package are useless once there is no "pavement".