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Old 05-25-2014, 09:49 PM   #1
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What gears should I get?

I have a 1998 Ford mustang gt and I'm looking to get a
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Old 05-25-2014, 09:50 PM   #2
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auto 4:10 if it's manual then 3:73
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Old 05-25-2014, 09:54 PM   #3
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auto 4:10 if it's manual then 3:73

What exactly do these gears do? Noob here talking .. Lol It's also my daily driver, fwy and streets?
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Old 05-25-2014, 09:58 PM   #4
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The higher the number means the faster you accelerate, but the shorter your gears are (shift sooner and lower top speed).
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Old 05-25-2014, 10:00 PM   #5
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Well the bottom line is that the smaller the pinion gear or higher the numerical ratio i.e. 4.10 to 1 (a typically high ratio) means that the quicker your acceleration will be and the lower your car’s top speed that can be reached will be as well. You will be going through the transmission gears more quickly while driving and achieving a faster acceleration but will be losing fuel economy as well. For example with a 3.41 gear you maybe be at 1800 rpm in 6th gear on the highway at 80 miles per hour but with a 3.73 gear you would be at say 2100 rpm at the same speed 80 miles per hour in 6th gear. So you will be burning more fuel at the same highway speed because you are at a higher rpm. See the manual transmission section for an explanation of how one wastes more fuel at a higher rpm.
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Old 05-25-2014, 10:01 PM   #6
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What exactly do these gears do? Noob here talking .. Lol It's also my daily driver, fwy and streets?
Seriously? the differential gears raise or lower the final drive ratio. The higher the numerical ratio (i.e. 4.10), the easier it is for the transmission to spin the tires, which can result in quicker acceleration but at the expense of higher cruising RPMs and lower top speed.

The opposite is true for lower numerical ratio (i.e. 2.73)
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Old 05-25-2014, 11:32 PM   #7
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I did notice an improvement in city mpg since the car doesn't work as hard to go through the gears. Now on the highway I'm turning 3k rpm at 80mph with my 4.10s so I noticed a difference in highway mpg.
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Old 05-26-2014, 08:17 AM   #8
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I got the 4.10 gears wish would of went 4.30 instead! Gained mpg in town. Have not driven out of town really so can't tell you highway mileage.
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Old 05-26-2014, 12:12 PM   #9
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Thanks it really helped ! I think I'm going to back off a little because of the lose in fuel Economy and not being able to hit my top speed -.- thanks anyway !!!!
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Old 05-26-2014, 12:14 PM   #10
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Thanks it really helped ! I think I'm going to back off a little because of the lose in fuel Economy and not being able to hit my top speed -.- thanks anyway !!!!
Yes because cruising at 150mph is commonplace.



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Old 05-26-2014, 12:23 PM   #11
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Yes because cruising at 150mph is commonplace.



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It's not but I do drive the hwy a lot without my rpm's too high and I also love to drive fast when I'm out in Mexico(go often) with a couple of other mustangs ...
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Old 05-26-2014, 01:49 PM   #12
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3.73 give you both
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Old 05-27-2014, 04:14 PM   #13
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4.10s if you are NA. Don't even mess around with 3.73s. Hell, if you don't do much highway driving get 4.30s. Worrying about hitting top speed is really dumb IMO. Just be aware that with a modular your first gear is right at 3.37 so you will be shifting after only a few seconds. If you prefer to wind out your gears and aren't concerned about 1/4 times then I'd stick with stock gears.
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Old 05-28-2014, 10:14 PM   #14
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Thanks everyone !!!! My uncle who is a mechanic convinced me and promised to put them on.. I'm getting the 3.73.. I was told I might need a master bearing kit? What do you guys think?
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Old 05-28-2014, 10:21 PM   #15
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Thanks everyone !!!! My uncle who is a mechanic convinced me and promised to put them on.. I'm getting the 3.73.. I was told I might need a master bearing kit? What do you guys think?
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Old 05-29-2014, 06:13 AM   #16
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AM sells the bearing kit and the gears as one package. Yes you should get the kit. And again... 3.73s are not really great on a modular. NA the 2V needs as much bottom end as it can get and 4.10s help a lot more than 3.73s do. 3.73s only exist for ppl who are afraid of RPMs being too high on the highway but they aren't with 4.10s unless you want to do 80 all the time. And if that is the case then one should stick with 3.27s.
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