[MOONRNR]

I would think the RDU (rear diff) is binding. Have you checked the fluid level?

 

[MOONRNR]

The shuddering feels like it is coming from the left front wheel area.

It only shudders during/after a left turn?

Is there any sensation in the steering wheel while this is happening? All tires the same size and correct pressure? Did the mech check all CV JOINTS? Wheel bearings? Brakes (ABS) seems to be functioning correctly, no sensation or overheating? Has the brake fluid been changed in the car's service history?

Did the mech run any possible DTC CODES? You can have ABS problems without it throwing a code.

Has either the PTU and/or the RDU ever been serviced? If the RDU is acting up, you should feel that in the seat of your pants.

Just trying to give ideas. Hard to diagnose over the net.

 

[MOONRNR]

Here is a similar thread describing RDU SHUDDER -

Rear diff / rear end noises AWD models SSM 46965 / TSB...

From Rear wheel noise like something hitting Two page document. First page covers 2017-2019 Escapes, second page mentions most 2013-2018 Ford models equipped with AWD (Escape and Kuga.)

www.fordescape.org

There is a referring URL TSB 21-2077 posted. CLICK on that and on the 2nd page find SSM 46965.