i kno to put a 10.25 in that you need to shorten the driveshaft.....my question is the guys who have done it....how short does it need to be? where do u exactlyl measure from? anyone runnin a detroit locker, and if so how much did u pay? my plan is to run 38's, i have 35's now and just ain't satisfied. i plan to go to 4.88 cuz i have the A4OD. i want that extra grunt since i have OD. but the grey area is how to measure for the length of driveshaft i will need, i have a guy that can build it and balance it for me.