c# - Creating restrictions on multiple objects that use joints -

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i got problem little concept:

let's say, have 4 objects: 2 rectangles , 2 spheres. link 1 rectangle 1 sphere, using joint, 1 sphere rectangle, using joint.

then, put rotation (using simple constant force test it) on rectangle. how end this: simple rotating doublewheel:

http://i.stack.imgur.com/eypsv.png

the thing is, know want add last rectangle on top of 1 of spheres, , still have structure rotating, not last rectangle:

so, add rectangle sphere, using joint, , end this:

enter image description here

the thing second rectangle rotate too, , block whole structure (logically) when hits ground. not rotate keep moving, top of car isn't rotating wheels.

i tried use configurable joints put restrictions, didn't find worth. found linear limit, which, when put 100, block item rotating moving, falls , nothing..

does have idea ?

thanks in advance, regards, em

edit: still searching configurable joint, guess have trick x/y/zmotions..


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