that was a great question asked by Derek and i wnt to know also how do you know if you have it too tight? i tighten it just enough that the diff gear dont move when i plaace a hex driver in both of the outdrives. then i install and break in and tighten 8th of a turn twice after i have dont 2 intervals of bench break in. i havent had diff prob since i have bn taught to do it this way. i still normally re do my diff every few months anyway is that normal rebuild time if i race 3 hard times a week ?