It all depends what motor you run, and what you want to do. Alot of 4wd HiLuxs have a 4.3:1 ratio diff, which is perfect for a higher reving 4 cylinder motor. If are are into drags, there are calculators you can use to find the optimum diff ratio for your setup. 4.3:1 is often the factory ratio behind 18R-G, 2T-G and 4A-GE engines.