Hi everyone. First time posting. So I have a 2000 f250 4x4. The rear diff has a lot of rotational play in it and slacks up and tightens when shifting or letting off the throttle and getting back on it (especially in higher gears). Anyway after talking to several shops about a rebuild I decided to replace it with a used unit. Unfortunately the axle tag is missing and wouldn't you know ford didn't put an axle code on the b pillar sticker. Is there any other way to i.d. this thing? 4 stealers told me 3.73 non limited slip and that's all the info on it. Even called ford customer care and the original selling dealer. Thanks!!