Don,

There were models of the 5-spd tranny (ASR being one, one of the "3"s (3H/3P) being another) which came from the factory with a limited-slip differential, so it is possible.  I'm just not sure where you might source an OEM LSD these days.

I know of one fellow who has a Peloquin torque-biased differential in a 5-spd AAP transmission.  I've driven it and it seems solid.

On 30-Nov-2014, at 12:37, Don Hanson wrote:

>   I know little about transmissions so I'm asking for information from
> those who've learned already...
> 
>   How does the locker system work on a Vanagon transmission?   How do
> limited slip differentials work?   Can I have either one of these systems
> installed into my Vanagon 5sp manual transmission when I get it rebuilt?
> I know the Vanagon 5sp manual trans is fairly rare, so I doubt there is an
> "app" for a Limited slip differential or a locker already available, but
> I'm interested in having my current tranny modified, somehow,  to produce
> more  low traction drive..
> 
>  I am already planning on refurbishing my transmission when I return this
> spring from an extended winter trip to the Desert.   I have owned and
> driven vehicles in the past with limited slip differentials and they are
> excellent,    If  cost is not too great, that would probably be the most
> convenient for my needs...A locking differential/rear end, that would also
> work just fine....I don't often find myself  where I'm needing just a
> little bit more traction...I usually just get stopped by the actions of
> other vehicles and can't get moving again........If I had to, I could
> easily get out and go under the van, even, to lock the differential and go
> again....then release that when the hill or the sand wash was in my
> mirrors...I don't mind doing the locking hubs on my 4x4 pick up 4wd
> system...A limited slip might let me avoid getting stuck in the first
> place...but cost is also a factor and I see many of the traction rear ends
> are quite expensive before you even start the machine work to install
> them...
> 
>  Does anyone have any knowledge to share on what might be possible?    I
> know having my current 5sp transmission rebuilt will probably be pretty
> expensive, but the 5sp is a very good transmission when combined with my
> 2.0 liter ABA hybrid inline motor.  When I have this gearbox totally apart
> I'd really be keen on modifying it to somehow give me better drive, if it
> isn't going to cost me an arm and a leg.   Ideas?
> 
>  Don Hanson