How do determine what gear ratio I have?

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01-09-2007, 01:50 PM

InferRedd

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Location: Lakeland, FL

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How do determine what gear ratio I have?

I recently seen a video of an automatic Mustang's gauge cluster while the drive stomping on the gas 0-40 mph in first gear. The driver claims he has 3:73 gears. My mustang is a 5-speed and does very close the same speed in first. I bought my car about 7 months ago and I'm wondering if I have stock or after market gears. How will I find this out?

I was set to believe the 3:73 gears will have shorter gears than stock. And 4:10â€™s will become even shorter. This video makes me wonder these questions.

If anyone can provide me some information about what gear ratio help for each gear Iâ€™d thank ya.

I understand how the gear ratio works just not sure if they become shorter or longer.

01-09-2007, 01:52 PM

amoosenamedhank

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RE: How do determine what gear ratio I have?

Jack the rear end up. Rotate your tires 360 degress and count how many times your drive shaft rotates. If it goes around 3 3/4 times you have 3.73

01-09-2007, 01:54 PM

InferRedd

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RE: How do determine what gear ratio I have?

True I'll check that out when I get a chance.

01-09-2007, 03:00 PM

99GTvert

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RE: How do determine what gear ratio I have?

what year is your car?

01-09-2007, 03:16 PM

CobraSnake

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RE: How do determine what gear ratio I have?

automatics are 4 speeds so 0-40 in first sounds right with 3.73s in a auto. If you have a 5 speed and its very similar then i would say you have the stock 3.27s i believe.

01-09-2007, 05:08 PM

Js 99 GT

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RE: How do determine what gear ratio I have?

Quote:

ORIGINAL: CobraSnake

automatics are 4 speeds so 0-40 in first sounds right with 3.73s in a auto. If you have a 5 speed and its very similar then i would say you have the stock 3.27s i believe.

+1 me too