The smallest spur i have is an 87 and the largest pinion i have is a 24.That gives me a roll out ratio of 2.456.With that high of a rollout i thought it would bog the motor down being geared high like that.This is not my area of expertese thats why i'm asking so i will try that.I have these spur gears-87-90-93-96 and for pinions-13-15-17-19-20-21-24.My tranny ratio is 1.87 and my tires are 5.4'' Does anyone see a better gear set up with what i have?