Are there any simple solutions for truck rattle....I already took out the spring bars that hold it up. What else is there? Its a civic by the way. Will dynamat solve this?
Cheap way is to apply silicon caulk between the trunk lid and the skeleton. Then use a sound deadener if needed. Why did you take out the springs?
Maybe tighten the screws/bolts that hold the lid on, a stronger latch, or the current one could use some adjusting.