XFGHIA747 76 Posted March 29, 2017 So i have i a au engine and auto in my burnout ute woundering what is the best diff gears to run the motor is stock has cometiton pacees amd good 3in zorst That pad is really sticky i think stock diff gears would hold 2ndbuut id like 3rd with the right tires would 3.89 be to low. Share this post Link to post Share on other sites