I would like to know how to change the sounds ...
to animate the suspensions you can find some example fbx files inside Steam \ steamapps \ common \ assettocorsa \ sdk \ dev \ car_pipeline_2.0rev \ Scene templates.
always in the same path you will find the Pipeline where you find quite well explained how to do the animations, the names etc, from page 56 onwards.
I know how to animate wipers, doors, wings and all about it, but I've never animated suspensions.
for the wheels, but for everything in general, you have to pay close attention to the orientation of the empty and their scales, which must always be numbers like 1.0, 0.10, 0.010 etc and in export you must have 1.0