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Only way to test is if someone has a shake table for a bus. Not sure if anyone in your area has one of those. As Richard said, better off just go ahead and replace it. Once you have it off no sense in putting it back on, especially with all the work you have done to yours. 
I have the set I got from Jack, that project looks like it may get moved up on my priority list. I am going to be under there to replace air bags, I found a pin hole in one of my drive bags.