your probably best off just pulling it and taking down to the store and matching it up, the U rear ends are hard to get the right parts for because they use some different parts, like when i rebuilt mine i got a bearing and shim kit from 4 wheel parts and the pinion bearing was wrong because our U's use a smaller bearing than every other d70 out there, i even called them and gave them all the info off the axle and i still got the wrong parts