On my e99 F350 the rear axle seal is leaking and causing the brake to be wet.

I started to disassemble the hub but found that there is a special nut holding the hub on to the axle housing.

I have the tool but do not know if the racheting nut has a locking tab or what. I do not want to brake something by wrenching on it.

My parts supplier thinks the axle is a Ford unit but wants the old seal to make sure.

Any help would be appreciated. Thanks