Choosing the right gear ratio needs to be balanced with the type of performance you are looking to improve. With Challengers, you have a number of races to compete in. Before you go buying gears you need to think about the obstacles ahead to ensure the best performance.
Road Racing: Road races have a lot of wide-open segments where top speed is of concern and some tight turns where throttle response will be demanded. If you plan on road racing you’re going to want to try to find a gear that’s got enough to fling you out of the turn, but allows you to climb to that redline with confidence. You don’t want something too high or too low, you want something that’s in the middle.
Quarter Mile: The quarter mile is a short run that allows you to build up some significant speed. Still, for this type of race, you’re going to look at something on the lower end of gear ratios. Something like a 3.73:1-3.92:1 would work just fine.
Eighth Mile: As one of the shortest types of drag racing you’re going to want to make every second at the bottom end count. For this type of ratio you will be looking for something extremely low. Many drivers will rub up against or surpass a 5.0:1 gear ratio.
Half Mile: The half-mile drag is super long in comparison to other drags and requires as much top end performance as possible. For this type of racing you wouldn’t want to go super high because you still want to give yourself something that will give you some extra bite at the end. Remember that the third generation of Challengers have overdrive gears which allows you to milk a lower ring gear for all it’s got.