When we think of suspensions we might think of shocks and springs but there's more to it. Suspension is a combination of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. Still following? It serve a dual purpose — first one is the vehicle's road holding/handling and braking for good active safety and driving pleasure. Second one is for keeping the vehicle occupants comfortable and a free of road noise, bumps, vibrations (among other things).
So the tuning of suspensions involves finding the right combination and compromise. It's important for the suspension system to keep the tires in contact with the road surface as much as possible, because all the road (and defects) acting on the vehicle do so through the contact patches of the tires. Another thing that the suspension also do is protect the vehicle itself and any luggage/cargo from damage and wear. because all automotive vehicle are not created equal (or the same size) keep in mind that the design of front and rear suspension of a car may be different.
If you find or feel that your vehicle feel unstable stop by he shop and we'll take a thorough look at it and let you know what's going on.