Ford requires that you cascade it down the supply chain. I would think GM and Chrysler would expect the same.
It is about risk management. For example any heat treat process in the supply chain could cause quality problems in the end product (for example fasteners made by tier 4, who has outsourced the heat treament).
It is about risk management. For example any heat treat process in the supply chain could cause quality problems in the end product (for example fasteners made by tier 4, who has outsourced the heat treament).