Lower oil pan could be feasible, but bed-plate no way. Bed-plate is also part of lower crankshaft bearing journals. My bed-plate has had a minor seep since truck was new, gathers oil slightly on lower bell housing, has not ever gotten any worse, so it's not worth the work to me to repair and I didn't trust anyone doing it under warranty way back when. Best way to tackle these operations would be to pull the engine.
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