It's likely the clutches in your differential are worn out making the ASD mostly ineffective.

Did the warning lamp illuminate in the cluster? If so the ASD was trying to lock the differential. As I understand it ASD works from a standstill.

It's a very simple system, you could hook the one solenoid up to a manual button if you wanted.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

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2013 Fiat 500E.