Few questions on D2 td5

Hi recently got a D2 td5 and selling my 300 to do this one up, I really want to make it a extreme off-roader step by step but just have a few questions. First off I was looking at maxxis trepadors 35s and want to know if it will badly affect my gearing or if I will need to swap axles change gear ratios? Another is what’s best oil for my engine the cars been well looked after and has had 1 previous owner since new and what lift would I need with 35s

2 door disco your avatar is that what your selling.

If you want to transform a td5 into what you say you need serious tuning engine wise too beside the gearing, After it's mechanically tuned you'll have to go to a specialist to get a remap addapted to the vehicle while it's with the new gears and big wheels, that's compulsory, you'll need bigger intercooler and radiator, straight through exhaust and a VGT turbo eventually... without these it will be a failure, the D2's management was not conceived for such things as without a remap if you exceed the tyre's diameters with more than 5% the EGT will go up in the sky and the power down especially if it's auto. As about how the ABS system will be mixed up it's another story which might be irrelevant for an extreme off-roader as long as some kind of lockers will be fitted