Can anyone help i have a yn55 2wd with a 1Y motor, late model 5spd, and arghhhhh a 4.556 diff ratio....my speedos reading 120kph when only doing 100kph. told to use a 3.9 ratio but what from and where..or even 4.11 help....going travelling soon and need to save fuel specially at todays prices. Contact me at hilux253@yahoo.com.au if u can help...urgent :(