How to update 2 TransformGroup at exactly the same time?

Hi all,
In my 3D scene, I would like to apply transformation to my shapes at the same time that my eye point is moving; for example, just like in car racing games where your car is always visible in front of you, and your eye point and lookAt point change as the car moves.
As a beginner to 3D programming, I've chosen the following approach. My first TransformGroup has the Transform3D object on which I'll called the lookAt method. This takes care of changing the eye point. My second TransformGroup has the shapes for the car as its child. Both TransformGroup objects are added to the root node of my scene graph.
While both TransformGroup have the ALLOW_TRANSFORM_WRITE capabilities set, I launched another thread to call the setTrasform methods on the 2 TransformGroup objects at regular intervals.
This seems to be working in terms of translating my objects and eye point, but I see noticable flickers. I suspect that's because for any given frame, the two setTransform calls to the two TransformGroup objects don't happen at exactly the same time. Do you think that is the problem?
Please let me know of any other approach to this problem.
Thanks in advance.

Use the Behavior framework for making changes in the scene. This uses an internal j3d thread which is in sync with the rendering thread.
See chapter 4 (Interaction) and 5 (Animation) in the 2nd module of the j3d tutorial (this may not be the correct chapters, since i have a rather old version of the tutorial)

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