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I dont know why they would limit themselves to the 3.92 ratio. My 2007 has a 3.55 with the Anti Spin diff. Its a 2wd too.



How do you know if your truck has the anti spin diff ? I have a 2007 4X4 with 3.92's. If I get into the throttle hard both wheels hook up. But on the jack stands when one wheel spins foreward, the other one spins backwards. What is the code on the build sheet for the anti spin diff ? I'm not sure of the changes thay have made in these modern trucks. My last truck was a 97 Ram with open rear end.