Offroad-Express

hey, i have an ln61 surf (ifs) that i have just pulled the chassis out and slipped one from a ln60 solid axle front, i had 32" wheels on but when it goes back on road i want 35's on it, i have been told that my standard ratio is 4.5 ish and told that i need 4.8 or higher can anyone help me as i am new to this , please, i have fitted a holden 308 V8 into it with a toyota w56 gearbox?
thanks heaps

with that power you wont need to change them, i had 4.88's with a hilux 5 speed and 35,s and it things back to standard