@memike and myself decided to start a thread all about 8 1/4 rears and common problems. Lets start with carriers and housings. The housings are two different distinct easy to identify The first is the most common with the pinion centered for 2.57 ratio and down the other is the off center pinion carrier for 2.56 gears and up. see how the pinion is off centered. Here is the 2.56 and up carrier.