Vibration and shutter

most often causes of vibration at certain speeds are from either wheels or drive shaft.
a shifted belt
bent wheel
failed ujoint

Is this OD shudder? I've seen this climbing hills. Shift down into drive, the shudder should go away. Once your on level ground, shift back into OD.
I'm not a tranny person, but, I have seen this, if we're talking about the same thing?

The vibration is from your AWD vehicle rear/center/front diff locking because it detects wheelspin. It is shifting power to the wheel with grip and feels weird. Slowing down will reduce this feeling, but if you are not getting a warning light, that is my diagnosis. Once back on solid ground the automatic AWD unlocks and the car/SUV returns to normal operation.

Have someone check your transmission fluid level. Probably low, so the shifting up and down is compromised.

Well, you did a really good job of describing the symptoms, but you didn't do so well describing the car. Are we talking about an automatic or standard transmission? are we talking about a four or six cylinder engine? You are asking about a drivetrain problem without giving any information about what drivetrain the vehicle is equipped with.

With all that said, IF we are talking about an automatic transmission being pushed by a V-6 engine, then there is a Technical Service Bulletin (TSB) that matches the symptoms you are describing. In this case, the problem is most likely being caused by a deformed or damaged exhaust pipe "A" mounting bracket.

Inspect the rubber bracket for cracks or torn rubber. If the bracket is damaged replace the bracket. Bend the stud on the exhaust pipe if necessary to get the stud to go through the bracket as straight as possible so the stud does not "ground" against the sides of the bracket. (see diagram)

Coil???????????

There is a motor/gear assembly inside the camera that moves the lens in and out and covers the lens when it is retracted. When it dropped, you most likely cracked or shifted something out of place. A broken tooth does not stop function, but shudders when it hits the gap. A shifted gear, slips and similarly may cause this effect. If it doesn't open the shudder, you get no picture.

You will need to open it up and attempt to repair the mechanics that drive the lens.

remove drive shaft and all vcu components, take for a short drive ( car will still drive in 2 wheel mode, if vibration gone suspect could be vcu , if still felt at front suspect ird if still felt in rear check diff mounts then diff out put bearings and nose end play.

I'd shudder too at 260,000 miles. . By shudder, do you mean vibration?. U-joints usually show up at around 45 mph. So try to narrow it down.

Just guessing. Could it be a warped brake disk? That would cause vibration. And vibration in steering might conceivably cause splashing out the power steering reservoir. You would know if the disk were warped by a shudder when you brake at hight speeds.