It's hard to know what you're trying to describe by "ticking"
Ticking would mean a continuous sound, as in the clock ticking....
One thing that is overlooked though, when it comes to annoying noises when going over bumps or rough surfaces for E39's.....check your headlight housings. There are some white plastic pieces that hold them in place, used for leveling adjustments (I think, if I remember correctly, it's been a while). They tend to break, and the headlights will move/vibrate when the car go over rough surfaces.
2012 Porsche 911 GTS
2008 ford F150 Foose Edition