Driven Constraints

I have 4 SUB ASSEMBLES
1 - Engine
2 - Mid diff
3 - Rear diff
4 Front diff
Within each SUB ASSEMBLES - I have them constrained and working the correct way with the use of a DRIVEN CONSTRAINT.
In the master ASSEMBLE that I have included an image of. I am having problems trying to add a DRIVEN CONSTRAINT @ top level so
that all 4 SUB ASSEMBLES will work with each other off the 1 DRIVEN CONSTRAINT is this even possible?
Thank you for any input to resolving this problem.