If there is one trans that is UNDER rated it's MB. We have a ML430 with their 5 speed auto. If you look at it's as big as a Allison and doesn't miss a beat. If you ever see one apart man is it big over built clutch packs and a perfect converter. My friend has a 240D not exactly a power house but does have 350K miles on it. I really think MB diesel tranny would be moving me to the dodge side. They are sweet vehicles.
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