Anyone know if the 2.6L and 3.0L block are the same? Reason is for transmission pairing.

Not quite ready to spend anything yet. Just doing some research so I can keep it in mind

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k