110 HCPU Final drive ratio?

I picked up my 110 HCPU yesterday and drove it home 75 miles at the heady speed of 60mph! Is the final drive lower in these than other Landy's as my 90 cruises much higher? I've read about Disco transfer boxes, are they an easy swap and whats needed in addition to the transfer box? What ratios are available?

Many thanks!

Any ideas?

diff ratio should be the same as disco or 90 which is 3.54 but some specials are built with 4.7 ,t /boxes come in 1. 6 ,1.4 or std disco 1.2 ,check axle ratio and numbers on t/box , if you jack one wheel up and to get one rotation of raised wheel prop will need to be turned 1.7 times for 3.54 and 2.3 turns for 4.7