This is just rambling thoughts . You can buy a aftermarket gear set for the series Land Rover transfer case . The ratios are such that the high range road speed is better but the low ratios for off road use are hardly affected . At the Traf swap a few years ago, a guy had a land Rover FS with that aftermarket gear set fitted ...the complete car was $600 ..... cheap when you consider the special gear set is about $900 to buy .
All that doesn't mean much for a C8AX ..but there were two diff ratios fitted on the C8A series ...