check if the spring is seated right first, if you've used coilovers, check if the springs are locked properly also check if the top bearing and bushes sit right ( and are build up the right way, you won't be the first that put it on wrong on one side) also check if the droplink is actually tightened down properly as they can be very loud if there is any movement on the bolts that should secure it. also check balljoint, track rod end connection to the hub, and the front wishbone bolt and bush for movement ( the rear is usually fine)