Isn't 4th gear 1 to 1?
Yes, but unless you use a rear end that is 4.11, your 4th gear will be like an overdrive. For example if your rear is a 3.08, your 4th gear will represent a reduction in rpm of apx 25%. Then your 5th gear (if you have a T5 with a .86 fifth) will be 2.65.
