Algodoo

On a real differential if one wheel locks then the other one goes twice as fast. if you used 2 motorized axles on the wheels and the input was unlinked to the wheels except by scripts, you should be able to make a script that makes the other wheel go twice as fast when one is braked.
I think you should be able to do that by making a variable (called _rel)that:
while wheel angVel = input angVel, then _rel = 1
while wheel angVel = 1/2 input angVel, then _rel = 1.5
while wheel angVel = 0, then _rel = 2

And all the values in between. This is just an idea i had, if you don't understand what i mean then i might be able to do it on a demo scene

I know how diff works, i made it mechanical:
http://www.algodoo.com/algobox/details.php?id=116365
But now i want to make it scripted
Btw.Thanks for your comment

I get an idea today during PC lesson in school
(We are programming in pascal )
If i made ratio of wheels speed like (X-rear wheel,Y-front wheel):
X/Y=Z
So for the back wheel: X=Z*Y and front wheel: Y=X/Z
Or no? What do you think about it

nice sceny