Owned mine for a year and decided to rebuild and replace some bearings, rebuild diff, etc. got it all back together and if I spin the front tires forward, the back go reverse. And vice versa. So each set is turning in apposing directions. I imagine 1 of my diffs are reversed? I know each has an up direction which I know is right, is there a diff between front and back diffs? I guess I could have reverse those. Looking for help before i start tearing apart.