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Question: almost violent shake in Drive Train over 50 mph.

Under 50mph, solid as a rock even under heavy exceleration.
Over 50mpg; regardless of gear selection (different rpm levesls), front drive train (more prevalent on the Right/passenger front) violently shakes under load, higher the load the stonger the shaking. Like a extremly out of balance side ways motion. less prominant on light load, disapears while costing. Crusing above 70 it is enough load where it is noticable.

I've replaced the CVC Axcels on both sides, the right side twice.

Front motor motor mount replaced. other mounts tight.

Brought to Transmission shop, They said it wasn't the transmission but check the axcels.

Tires rotated several times and rebalznced.

Bearings and Idler arms tight.

Rotors have no pulsating.

Any insight, Tires have even wear and no damage, 60% life left. Cost of transmission replacement is more than the value of the car even if it is in very good condidtion.

The only other thing I can think of is a CPU issue that is causing the engine to buck under a certain load and speed.

Any insight would be appreciated.

This was a good exercise, I just though I should try replacing the fuel filter. That would effect load at higher speeds. Air Cleaner is new but may be the Fuel Filter or Pump?