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
"TheBeast"1997F2504x4dually4.10's,160k,140VIDM,HPX ,4"dp&5"exhaust,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 and IC,trucool,coolant filter,scan gauge,lots of other gauges,racer x valve body and billet converter, upgraded trans, F550 leaf springs,mean green alternator and starter,SD dual tensioner upgrade, cold ac mod
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