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Th400 Transmission

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3. With the engine out we did a filter change on the TH400 and planned on a deep pan from TCI. We found that our factory pan was just as deep as the aftermarket pan, and we wanted a bung for a transmission cooler sending unit, so we kept the stock steel pan and added the bung. Only five of the bellhousing mounting bolt holes are used when attaching a TH400 to a late-model LS series engine.