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    2001 4R70W slips in first gear but not in manual first

    Like the title says, I have a 2001 Expedition, 2WD, 4.6L engine, with a 4R70W. When in Drive, the tranny slips when starting out from a dead stop. However if I put it into manual first gear, no slippage. Any suggestions on what might be going on?
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