The torque spec for the large axle nut is 150 to 175 lbs. ft. I recommend this procedure, use a file to clean any burs from the wheel hub, axle and key slot and key. slide the wheel hub on the axle shaft lining up the key slot, push the hub on as far as you can by hand. Install the key with the tapered end in first and the taper facing the axle. Leave the key pocking out of the slot about a 1/4 inch. Install the large washer and axle nut. Torque as above, don't use the max torque at first as you may need to go a little more to line up the cotter pin slot, this is why there is a torque range. Allowing the washer to seat the key will make sure it seated at the correct depth and that the wheel hub and axle shaft are true to each other or you could actually get a wheel wobble and brake drum to shoe misalignment. Also if the key is installed before the hub and then the hub installed you will crack the key way in the hub at the inside of the hub where it is the thinnest.
Hope this helps.
: Anyone know the torque specs for the large
: front end axle bolts on the 1965 FC 150?