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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Is there a feeling that comes along with this sound you get?
Like a sudden bump which may be the steering stop causing this.
Hello again Chris here,
The rear axle in the Ford Fusion does not have limited slip.
My suggestions would be to get the vehicle on a rack to inspect the rear suspension to see if there are signs bolts have been moving and wearing into the chassis from not being torqued correct. Remove the rear driveshaft and retest to see if the noise still occurs.