Outer Limits 4x4 Board

I came across a website once that explained all bits and pieces of cars, trucks, etc. in the form of animated diagrams and went really in depth of diffs, gear boxes, etc. and can't seem to find it anymore, maybe it was removed. Anyway does anyone know of any really good ones like the above on the net currently?

from memory it was a UK based site

how things work ?

yeah, it was along those lines. I just thought on the off chance that someone may have come across it