How can I tell what Gears are in my 03 GT? - Mustang Evolution

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Old 02-17-2013, 03:57 PM   #1
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How can I tell what Gears are in my 03 GT?

Hey guys, I am new to this forum so don't hate too bad.

I purchased my car in October 2011. It is a 2003 GT. Mostly stock under the hood. It has aftermarket exhaust and the previous owner had put in a set of gears in the rear end. No documentation came with the car and I have been unable to get in touch with the previous owner to ask questions.

What can I do to check myself to see what gears are in the car? I am getting ready to put in a new clutch and everything will be open and accessible and I would like to know what I am running on.

Thanks in advance for all help.
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Old 02-17-2013, 04:20 PM   #2
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I believe u lift rear wheels and turn them by hand, then count drive shaft revolutions.
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Old 02-17-2013, 04:21 PM   #3
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There is a YouTube video on how to do it.
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Old 02-17-2013, 04:28 PM   #4
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I will check youtube then. Hadn't even thought of that. Thanks.
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Old 02-17-2013, 04:30 PM   #5
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Very welcome.
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Tint, louvers, Shelby brake light cover, sequentials, brake vent ring delete, Shorty antenna, JLT cold air intake, BAMA tune, VMP 2.5 S/C pulley, Ford racing shifter, MRT OR-H, SLP loudmouths, BMR adj PHB, BMR LCA, Eibach Pro-Kit, cobra jet big oval TB.
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Old 02-17-2013, 05:00 PM   #6
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I found this in another thread on here. The original poster is listed as well. Not trying to steal anyone else's thunder. I think that this is what fomoco4life was talking about. Again, thanks guys for the info. This should be easy to check once I get the care in the air.

GrabberBlue5.0

The ratios have to do with numbers of turns of the driveshaft vs the rear wheels. A 3.55 gear is actually 3.55:1 ratio. For everytime the driveshaft turns 3.55 turns, the rear wheels will complete one revolution. The shorter the gear (gears get shorter as their ratio number increases) the higher the tq multiplication and you will get more of that being sucked into the seat feeling. But it also takes higher rpms to go the same speed. For example (not exact numbers but used to prove a point) with 3.31 gears you will be traveling 70 mph at 1800 rpms and with 4.10's the same speed might be achieved at 2600 rpms
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Old 02-17-2013, 05:04 PM   #7
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There you go brother. There's your answer. It's the same thing the YouTube video shows. Awesome stuff.
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Old 02-17-2013, 07:42 PM   #8
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Just use the spin the wheel trick...its a sure fire way to know everytime.
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Old 02-17-2013, 10:14 PM   #9
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That's what I plan on doing. I will have it up on stands Saturday to start the teardown for the clutch. Thats the first thing I plan on doing.

---------- Post added at 11:14 PM ---------- Previous post was at 11:13 PM ----------

My speedometer is off by about 5mph at around 40, and 11mph at 100. I saw that AM makes a piece that can re-tune your speedo.
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Old 02-17-2013, 10:16 PM   #10
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you're better off just saving for a tuner then fixing it that way
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Old 02-17-2013, 10:44 PM   #11
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I didn't realize that a tune would re-cal the speedo, but that was the main reason I was trying to find out the gears that it has in it. I plan on doing that later this spring. Thanks again for the info.
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