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Old 10-12-2015, 02:52 PM   #1
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How to find out what gears i have

So it has come to my attention from my friends, that i do not have stock gears.

They think i have 3.53 or 3.73s. Well i wanna know how i can find out. If i have to take it to a shop i will but if i can do it at home please inform me.


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Old 10-12-2015, 03:19 PM   #2
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Jack the rear end up and turn the driveshaft. Pick a lug nut and see how many revolutions it makes for one revolution of the driveshaft.


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Old 10-12-2015, 03:25 PM   #3
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Slater's way is best, but if you don't have access to a jack and jack stands, you could try this:
Mustang Rear Gear Ratio to RPM Chart | AmericanMuscle

See how many RPMs @ 65mph and you should be able to figure out the gear. If you are going to jack your car up, please use stands or some other form of support. Going under the car and moving things with just the jack is playing with fire. Let us know what you come up with! If you do have non-stock gears that must be a pleasant surprise.
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Old 10-12-2015, 03:38 PM   #4
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Originally Posted by Slater2111 View Post
Jack the rear end up and turn the driveshaft. Pick a lug nut and see how many revolutions it makes for one revolution of the driveshaft.


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You got it the other way around.

You see how many times the driveshaft turns per 1 wheel revolution.
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Old 10-12-2015, 03:40 PM   #5
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Yea that's what I meant. It would have gotten him there. Lol. Just would have had to come back and ask why it was only 1/3 of a turn. Lol


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Old 10-12-2015, 07:28 PM   #6
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I have a tuner. And at 70 mph the rpms are 1850-1900.




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Old 10-12-2015, 07:34 PM   #7
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Everyone who i am friends with who have cars, or who owned 2 valves say that my car is the best running 2 valve they cam across. Besides speed mister who lives near us.

They say i do not have stock gear but i do. I really think i do.


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Old 10-12-2015, 11:38 PM   #8
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You should have 3.27 if your rpms are under 2k at 70 mph.

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Old 10-13-2015, 12:21 AM   #9
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You should have 3.27 if your rpms are under 2k at 70 mph.

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They are. But everyone says there not stock, i swear..


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Old 10-13-2015, 12:31 AM   #10
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I would say stock with those rpms at 70 mph. Mines a 96 and with 410s in a manual in 5th at 70 Im around 2300-2400 rpms

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Old 10-13-2015, 07:07 AM   #11
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It's awesome that you enjoy your car's speed with the stock gear set. Any other mods your car might have that might contribute to fast feeling? Maybe the tune you're running? I know stock vs tune makes a pretty big difference in feel, even with a mild street tune.
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Old 10-13-2015, 07:08 AM   #12
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what year is your car? the transmission gears are different in certain years. a mid 01 to 04 has a tr3650 which is 3.27 stock and will run 18k rpms at 70mph roughly.

if your friends have similar mustangs, and yours is the best running one, then their's must be busted or something. are they driving yours or are they sitting in the passenger seat? because sitting in the passenger seat, a car always feels faster. maybe yours is louder so they think your rpms are higher when not looking at the gauges?
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Old 10-13-2015, 07:09 AM   #13
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Also tire size, specifically tire height, will have an impact like gears. Shorter tires will have similar effect on acceleration as shorter gears. Are your stock or aftermarket?
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Old 10-13-2015, 11:20 AM   #14
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Also some cars, for whatever reason, run like a scalded dog from the factory.

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Old 10-13-2015, 01:28 PM   #15
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Originally Posted by VeryVeryEvilGuy View Post
It's awesome that you enjoy your car's speed with the stock gear set. Any other mods your car might have that might contribute to fast feeling? Maybe the tune you're running? I know stock vs tune makes a pretty big difference in feel, even with a mild street tune.

My mods are a bassani off road x pipe, with slp catback

X4 tune by mpt running 93 performance

Mgw short throw


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---------- Post added at 06:28 PM ---------- Previous post was at 06:27 PM ----------

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Originally Posted by fenixignition View Post
what year is your car? the transmission gears are different in certain years. a mid 01 to 04 has a tr3650 which is 3.27 stock and will run 18k rpms at 70mph roughly.

if your friends have similar mustangs, and yours is the best running one, then their's must be busted or something. are they driving yours or are they sitting in the passenger seat? because sitting in the passenger seat, a car always feels faster. maybe yours is louder so they think your rpms are higher when not looking at the gauges?

Late 01, yes i have 3650.


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Old 10-13-2015, 01:30 PM   #16
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Also tire size, specifically tire height, will have an impact like gears. Shorter tires will have similar effect on acceleration as shorter gears. Are your stock or aftermarket?

I have aftermarket tires.

Fronts 245/45 17s

Rear 285/40 17s


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Old 10-13-2015, 01:31 PM   #17
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Quote:
Originally Posted by fenixignition View Post
what year is your car? the transmission gears are different in certain years. a mid 01 to 04 has a tr3650 which is 3.27 stock and will run 18k rpms at 70mph roughly.

if your friends have similar mustangs, and yours is the best running one, then their's must be busted or something. are they driving yours or are they sitting in the passenger seat? because sitting in the passenger seat, a car always feels faster. maybe yours is louder so they think your rpms are higher when not looking at the gauges?

I also let them drive it. And they act like they never came across a 2v. They say something is done


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Old 10-13-2015, 01:39 PM   #18
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A lighter and less restrictive exhaust system like yours coupled with a Race Tune will definitely get a noticeable jump off the line. 285/40/17 tires have just under 26 inch height, if I'm not mistaken. If your friends have tires that are taller, then that accounts for your difference in acceleration. Sorry, don't know the stock tire heights for the earlier 2000's GTs.
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Old 10-14-2015, 02:35 AM   #19
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A lighter and less restrictive exhaust system like yours coupled with a Race Tune will definitely get a noticeable jump off the line. 285/40/17 tires have just under 26 inch height, if I'm not mistaken. If your friends have tires that are taller, then that accounts for your difference in acceleration. Sorry, don't know the stock tire heights for the earlier 2000's GTs.

Ohh yea, my exhaust set up is top end. Gained power at higher rpms, but lowest slight low end


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Old 10-14-2015, 06:18 AM   #20
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245/45/17 for new edge gts. 3.8's have a close wheel base, but slimmer, longer tire and smaller rim.

but either way, theres a lot to factor here. were talking about butt dyno.

mine doesnt launch very well, and by that i mean simply taking off in normal traffic. but in reverse, i can practically drag race backward. Im assuming its because of my worn rear suspension.
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Old 10-14-2015, 06:50 AM   #21
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Good point about butt dyno. Sometimes a car just feels faster. Your wide tires are definitely going to give some good traction, which might make the car feel more responsive and quick. Have you tried timing your launch to see how fast it actually is say 0-60 or 1/4 mile vs your friends? I really think that the traction from the wider wheels, lighter exhaust, and the race tune are what's giving you such a power boost, or at least feel, over what your friends drive. An aggressive tune alone will do wonders to a car, especially a GT. Now, imagine if you changed up your gears on top of all that jaja
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Old 10-14-2015, 08:28 AM   #22
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Drop some 4.10s 👍

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