I've never messed with the dana 50 ttb, but with the d44 ttb, the spindles use 5 bolts, where on the solid HP 44 they use 6, I believe. The easiest way to convert to 8 lugs is to find some 8 lug hubs and knuckles and just swap everything from the knuckles out over to the HP44.
When I converted my EB's D44 to discs, I used Chevy spindles with Ford hubs and rotors so, maybe Chevy 8 lug D44 (not the HD version) hubs and rotors might fit on the Ford spindles Something to look into.......Hans
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