Vibration While Turning

[JMild]

My 2017 Forester knocks and violently vibrates while turning slightly left at high speeds(60+mph). Stops knocking with sharper turns and no knocking at slower speeds.

I've visually inspected CV axles and rubber bushings on control arms. No torn rubber boots or signs of wear.

Any ideas what to troubleshoot next?
Could it be a CV joint even without a torn boot?

 

[Ecmbuster]

Use the correct torque specifications.
Blocked and have it safe in neutral / parking brake position.
Check wheel nut torque on all wheels.
Placing both front corners of the suspension on stands, rotate by hand ONLY!
Placing both rear corners of the suspension on stands, rotate by hand ONLY!
Check axle flange torque along with smooth rolling axle bearings.
Roll the wheels by hand and hold the suspension spring, rough bearings are felt through the spring.
Check / test all suspension components (CV joints, ties rods, control arms, sway bar links and related bushings
At each corner, rotate the wheels by hand for "true" rotation.
Check the fluid levels in the differentials and look for "metal shaving contamination" (drain and fill)

CV shafts that are worn / damaged will have "roughness associated" with rotation and with turns of the steering.
ALL BY HAND!

If too difficult, hire a professional.

Fix it before your drive the vehicle. It's a disaster in the making.