2017 Peace, mercy, and blessings of God be upon you For sale or exchange LSD 3.90 LSD 3.90 LSD 3.90 Differential fits for Mopar cars 2015 and above, its ratio is 3.90. It is for a Challenger with a manual transmission, not the 3.09 ratio. The differential is better for performance, it makes the car more responsive and increases horsepower. Whoever wants to benefit from it, I have it because I am returning the car to its original factory state. I accept exchange for a 3.09 differential for SRT.