Well, really they all should be tightened under load... the easiest way to do this is while your car is on jack stands, place a jack under the knuckle/spindle and jack it up to place a load on the suspension components... keep jacking it up until the car lifts just slightly off of your jack stand... once this happens, you know that there is plenty of load on the suspension and all of the bolts can be tightened.:thumbup: