Originally Posted by 00xj54
Well the 00-01 have low pinion D30 in the front. What does that mean? and is better then the high pinion?
The low-pinion has the pinion below the centerline of the axle. The high-pinion is above the centerline.
High-pinion is preferable for several reasons.
First is driveshaft clearance. With a HP axle, the driveshaft is a good 2 or 3 inches higher up than the LP. That could very well be the determining factor on whether or not your driveshaft survives a rock.
Second is driveshaft angle. A higher pinion gives you a much better driveshaft angle and this means less chance of vibration on a lifted XJ.
Third is strength. The ring and pinion on a HP axle is slightly stronger than on the LP.
That being said, lots of people use the LP Dana 30 without problems. Its the same axle used in the TJs. If you are going to lift it above 5" I think it would be a very good idea to look for a HP, or if you ever just have a good opportunity to get one. Make sure you have at least some lift however or the driveshaft might make contact with your exhaust.