On the F350 with the Dana full floating axle, there is a special tool for the axle hub nut. Are you using one? Also, on the ford axle, they have a special socket for the same purpose. Pic 1 below is for the Dana and pic 2 is for the Ford.
Please note that if you over torque the axle nut, it will damage the bearing. Let me know which setup you have and if you used the correct tool.
See pics below.
Images (Click to enlarge)
Sunday, October 23rd, 2022 AT 8:19 PM