The rear suspension was loosely based off the old E-Class but made in steel instead of aluminium.
So more of a redesign than a transplant for certain.
The 5-Speed auto that is built in Indiana is a Merc design too. And they share some bits like the turn signal stalk and what not but nothing too major. The AWD system is based on the Merc 4-Matic (Magnum and 300 only for now). I think the stability program and brake assist are also.