let me google that for you...also, the current chargers have 2.65 gears. The AWD, SRTs and Road and Track models (29r package) have 3.06 gears. The Mopar 11s have 3.91 gears.
What is the rear end gear ratio and how does it affect performance?
Ive heard alot of people talk about rear end gear ratios and gears like 4.10 and 3.70 I really want to know exactly how they work. How can you change them?
It's the ratio of how many times the drive shaft turns to how many times the axle turns and is set up by choosing how many teeth are on the ring and pinion gears.
Bottom line, the higher the ratio, the more power (Torque actually) at the rear wheels, also the higher your engine runs (RPM's) and the poorer your gas mileage.
btw - higher ratio is referred to as lower gearing (geared down) and lower ratio is refereed to as higher gearing ... nice and confusing eh?
example, with a 4.10 gear set, the ratio is 4.10 to 1 so for every 4.1turns of the driveshaft, the rear axle will be turned one time and you will have a torque advantage of 4.1x
On the flip side for every say 10 turns of the wheels, your drive shaft will turn 41 times & your engine has to turn 41 times in high gear (not overdrive).
With a 3.70 gear, your Torque advantage is 3.7 times but now if your wheels turn 10 times, your drive shaft and engine will only turn 37 times. As with everything auto, always a trade off.
see also: http://www.howstuffworks.com/gears.htm