I'm not complete help, but I just put my 50 back together. I however have auto hubs, and I tightened my single nut to 50 and backed off 1/4 turn, then tightened a hair more. My directions say to tighten to 16 inch pounds, that aint much and I have no wrench like that so I tightened a hair after backing off 1/4 turn.
From what I came up with on this link you are right on the locknut.
Darin I BLEED BLUE 76F250 66 fairlane dragcar514
1997 F250 7.3,4.10's,156k,140VIDM,HPX,4"straight pipe,ccv mod, S366 turbo, 6637, elec. fuel,rosewood stage ones,php tunes,arp studs, comp springs, smith brothers push rods, T500 HPOP,180 tstat,6.0 fan,6.0IC,trucool,coolant filter,scan gauge,lots of other gauges,racer x valve body and triple disc billet converter, upgraded trans, F550 leaf springs,mean green alternator and starter,SD dual tensioner upgrade, riffraff diff cover, cold ac mod
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