I researched a lot about the startup kick, clunk, jolt, knock, etc... that I hear/feel 1 second after starting up. But i couldn't know what was the conclusion. here are the speculated reasons:

1- Software issue
2- Starter
3- Low/old transmission oil
4- The nature of the beast
5- Drive shaft
6- A midget with a sledge hammer hidden somewhere
7- None of the above

Can anyone advise what this clunk is? It stresses you out each time you start the car, dreading the jolt...

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BMW X5 3.0si 2008
Premium Package
Light Package
Navigation
Reverse Camera
Rear Sensor (retro-fit)
Comfort Access
Spare Wheel
Power folding mirrors
Voice Control w Bluetooth
Power trunklid

BMW X3 3.0i 2006
M Aerokit
M Sport Package
Navigation System
BT Handsfree
Xenon HID

BMW X5 3.0i 2001 --- SOLD