The average cost of a transmission repair for a 2003 Mercury Grand Marquis typically ranges from $1,500 to $3,000, depending on whether you opt for a rebuilt or new transmission. A rebuilt transmission usually costs between $1,500 and $2,500, while a brand-new transmission can run from $2,500 to $3,500, including labor costs. Prices may vary based on location and the specific repair shop's rates. Always consider getting multiple quotes for the best deal.
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