Today when i reversed my NF out of a car park, i sudenly slammed on the brakes because i was heading straight into a big LPG cylinder. There was a very loud bang from the front of the car, like metal hitting metal. It wasn't my nuts hitting the floor, i know that much.
Is this just a case of tightening under body bolts, such as those holding the K frame in place? is tightening the underbody bolts part of the regular servicing? I noticed it's part of holdens major service, but i suspect its to stop their cars from falling apart.
My Ef used to do the same thing.