Thanks for the replys :) probably in the wrong place but what is the best transfer ratio and tyre diameter want to keep to 750 R16 have a defender LT230 and a Disco LT230 not sure which to fit to LT77

Hello I'm new to LandyZone Hi I'm currenly trying to fit a 300TDI with LT77 & LT230 to my 88 Series 3 I would like your thoughts on fitting Ashcrofts Part Time 4WD kit for the LT230 How much of a disadvantage will it be to loose the transfer box diff lock ?