I just ordered a HPD30 and Ford 8.8 from East Coast Gear Supply. I got 4.88s put in them. I have not installed the HPD30 yet, but both axles are identical and will bolt right in. The 8.8 lined up better then the D35 did, and I am re-using my stock ds and upper arms with minimal vibes.
Hope it works out for you, you will love 4.88s.
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