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Make sure your tail pipes,mufflers, mid pipes, are secure and not tapping on anything at the rear of vehicle. have a friend tap the gas pedal and watch when the pipes flex under exhaust pressure, may have to be under a load with brakes applied. If the exhaust system has been replaced the shop may had install it without checking clearances between pipes and frame. I had my exhaust changed in my 95 mustang gt from the headers back and the mufflers were turned 45 degrees, which only gave me a less then a half inch clearance near the frame. Every time I took off it would sound like my tranny was going to fall out! I hope this helps let me know what you find out.

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14y ago
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Q: What is cause knocking felt under floor board on driver on a 1998 mustang gt?
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