not brilliant at all, just taking a British, invention :)

Harry Ferguson et al developed it in the 50-60s. I think it was a
simple viscous coupling, he also developed, dry plate clutch type
diffs too.

Google Tony Rolt for a real life hero chappy, involved with
establishment of Ferguson's 4wd.

I think the Jensen FF (ferguson formula)  did not use a vc, but dry
plate clutches (did have ABS though). GKN is the heir to the Ferguson
4wd biz, they still make VCs

You have to stick up for the Brits once in a while :)

alistair

On 3-Apr-10, at 3:07 PM, Scott Daniel - Turbovans wrote:

for VW to pull off a VC with no electronics was really quite brilliant,
especially for the era.
Heck, we should be glad there's no Check Engine Light associated with VC
performance on our syncro vans !