Great quality gear, fit perfectly into stock diff housing when paired with the 15T bevel gear. One thing to note if using the GPM diff lockers with the stock diff/drive cups, you will need to file down the top of the crown gear up to 1mm where the drive cup is inserted (recommend using a dremel). This is due to the drive pin hole in the cup shaft not quite lining up flush with the pin hole on the GPM diff lockers when inserted. It simply will not fit with stock diff cups if this is not done. Only takes a few minutes to fix.