when i start my car and put it in drive or in reverse my car jerks, sometimes it dosent most of the time it does though. the jerk sometimes is small or sometimes its a real big nasty jerk. i check the transmission fluid and the level is fine. any ideas?

 

automatic or stick shift?

 

If auto, might be bad U joints.

 

automatic

 

that is definitely u joints. that happened before I shattered mine. grab the driveshaft in one had and the diff yoke in the other. if you can twist them at all it's your u joint.