Have any pics of the Xterra on 35s?
For the knuckles, I run ARP studs. Never had a problem on 35s. You can also do the 5th stud mod, with or without ARP studs. Front range offroad offers keyed arms/knuckles (I think this is the strongest option). While you're messing with the knuckles check out Marlins 25mm upgrade.
80 shortbed-22re,w56,Marlin 23 spline dual cases,HighAngle drivelines,RUF/63"chevy's,35''mtr's,85 front axle,30 spline Longfields, Allpro highsteer.87 rear axle,5.29 gears,rear spool,BudBuilt cm, marlin HD clutch,ramsey 8000 winch.
Also 84 toy DD 22R 4.88s,33'' toyo mt'z, marlin clutch,4inch lift/63's, HA drivelines.