Spindle just came in, inexplicably with a spindle nut off an automatic locking hub attached - no idea. Either way, I'll see if I can't get it thrown on tonight. Thanks for the confirmation of my torque settings, to all and sundry.
The sender probably put a nut on it to protect the threads.
1997 F-350 XLT, 4wd, crew cab, E-4OD,TDE-1, 4:10's (sold it, has 328k miles)
2017 F-350 XLT, 4wd, CC, LB