I started a new project for animating some types of linkworks, mostly used by tanks, excavators, dredges and other vehicles.
In fact the script is commercial, but feel free to use the demo without license restrictions.
At the moment the demo version includes 18 2 wheels based linkworks and 1 - 4 wheel. It works in 3ds Max 2009 and newer.
Maybe it is also compatible with some older versions.
I will try to add support for 3ds Max 4 the next days.
Watch the very starting video tutorial at http://youtu.be/LzhH0fY1Y0Q
I will post on this topic news to the script and see your feedback.
Thanks for watching!