You're correct. Most will only do this upgrade at trans or at least clutch time. This does require taking a part the ring gear carrier and those ring gear bolts should be replaced.

Dennis,
From my phone.
________________________________
From: Zeitgeist<mailto:gruengeist@GMAIL.COM>
Sent: ‎12/‎31/‎2013 7:59 PM
To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
Subject: Re: New Locker from Weddle

I assume this can be added by dropping the trans and pulling the
bellhousing off, which allows access to the diff.  Most folks don't have
the tools handy to set the R&P backlash, but technically I don't think it
requires a full trans rebuild.

On Tue, Dec 31, 2013 at 3:19 PM, Mike Miller <mwmiller6@att.net> wrote:

> So $700 to put in the locker in the diff, $600 for the locker and $2000
> plus for the tranny rebuild plus the R and R?
>
>
> On Dec 31, 2013, at 2:48 PM, Dennis Haynes wrote:
>
> > ~$700+ in these parts plus all involved in trans overhaul.
> >
> > Dennis,
> > From my phone.
> > From: Mike Miller
> > Sent: 12/31/2013 5:23 PM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: Re: New Locker from Weddle
> >
> > One, well this one at least, wonders how costly it would be to install
> said locker?
> >
> > Any quotes, or guesses?
> >
> > Mike
> >
> > bURNINGvAN forever! Or at least this year.
> >
> >
> > On Dec 31, 2013, at 1:46 PM, Jeff Schwaia wrote:
> >
> > > Weddle has a new locker available:
> > >
> > >
> > >
> > >
> http://weddleindustries.com/products/new-products/new-vw-type-2-mini-locker
> > >
> > >
> > >
> > > Cheers,
> > >
> > >
> > >
> > > Jeff
>

--
Casey