Ofna makes the diff gears. You can get them from http://www.nitrohouse.com
Go to their website and download their manual write down the part number so you have everything you need when you order. You will need front and rear diff cases, front and rear diffs, 2 pinions, 2 ofna short shafts and bearings. The ofna pinions won't fit on the short associated shafts. Study the manual before you order make out your list good luck.