im going to pick up some used shocks for my car..how can i test them to see if they are in good condition?

 

when you push down on them and they move back up, no leaks, the rod is not nicked, dented, etc.

 

if shocks are blown..would that cause your car to drop down?

 

Ride height has nothing to do with shocks. Usually a blown shock will give you a bouncy rebound when you hit bumps. Like CivicRacr said push down on the piston and see if it comes up. Also check for any grease that may have leaked and check for scratches on the piston.