The J30 is only .75" longer. I'm going through the parts catalog and I'm not seeing a difference between the pinion on the ABS housing and the Non-abs housing. I'm not saying that there isn't a difference, but PN wise, I don't see one.
Pull the J30 apart, keep everything in order and measure the J30 pinion length and note any differences you see between the two while it's out of the diff. If there are noticeable differences, you have your answer.
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