I recently bought a 2002 Range Rover after selling my notorious freelander.
Enjoying it nicely, but i also notice when i shift gear from D to Reverse then there is a slightly loud clak noise coems if my windows are down. If windows are clsoed then i cant hear anything. Its a similar clak when in non AWD car you engage 4WD and you hear that clak for engaging and disengaging. Something similar to this i used to hear in my Land Cruiser few years back when i use to engage 4WD = single clak.
This noise has just started recently from last month, all these 5 months there was no problem at all.