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What is the gear ratio for a 2003 mustang gt?

The gear ratios for a 2003 Mustang GT's transmission depend on whether it has the standard Tremec T-45 5-speed manual or the optional 4R70W 4-speed automatic transmission. There's no single answer.

You'll need to specify which transmission type your Mustang has to get the correct gear ratios. You can usually find this information on a sticker inside the driver's side doorjamb or in your owner's manual.