Don, I'd get something bigger than half inch. I have twisted them off doing stuff like this. Three-quarter with a big cheater pipe would be better. 

As for your methodology, keep well away and let is know!

Jim

On Jul 19, 2011, at 9:01 AM, Don Hanson <dhanson928@GMAIL.COM> wrote:

>  I need to change in some new rear wheel bearings on my 84 Van, manual 5sp
> tranny.  I know the axle nut is really a pain to get off, having recently
> fought with a bug rear axle nut...  I have an idea to attempt to use the
> weight of the van to help me get this one loose.  I do not have an impact
> wrench nor a handy mechanic shop.  I do have a very stout long 1/2" drive
> breaker bar and the proper socket.  My brilliant idea is to lift the van's
> corner, put the socket onto the axle nut with a long extension on a stump or
> something and then letthe van lower away to break the nut loose...  I've had
> some PB Blaster on the nut for a few days now.  Second question:  The
> threads are normal, right?  Lefty-loosey?  Standard threading?
> 
>  Think this will work?  I plan on standing back as I lower in case the
> tools should break...
> 
>  Don Hanson