The unit hub is held on with four studs.. the large "nut" I was referring to is the custom sized retainer on the back of the assembly that holds the stub spindle in.
Running it without the lockout isn't going to cause the wheel or unit hub to fall off... what could happen is the unsupported stub axle could flop around and destroy the needle bearings.
I attempted to drive my truck without a lockout and the stub went ..clunk..clunk..clunk ... not saying yours will do it also.
These front diffs are **** to start with , don't make it any worse!
Jeff
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