Why change gears? - Forums at Modded Mustangs
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post #1 of 74 Old August 28th, 2011, 10:44 PM Thread Starter
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Why change gears?

Ok I opened one topic awhile back about which gears to buy so sorry about this. What exactly do upgrading the gears do? The different ratio determines how many times the tires turn correct? I want more power in the low gears. Faster takeoff is what I want. I drive mostly in the city everyday so that's what I enjoy most. Then just the one or two long trips a year to see family. I read 4:10s is what I need for what I want. That will not tear anything up on my long trips will it? Also I'd need to adjust my speedometer then correct? Thanks


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post #2 of 74 Old August 28th, 2011, 10:48 PM
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4.10s will give you alot better acceleration and will slightly decrease your fuel milage on the freeway. long term nothing will be bothered. have a professional install them and you will need a handheld to reprogram the speedo


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post #3 of 74 Old August 28th, 2011, 11:04 PM Thread Starter
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I will definitely have a professional install them. Yeah after I buy the gears I'm going to purchase a CAI and tuner combo. Will the tuner fix the speedometer or do I need to purchase something else for that?


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post #4 of 74 Old August 28th, 2011, 11:08 PM
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Yes the programmer will fix the speedometer.
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post #5 of 74 Old August 29th, 2011, 01:23 AM
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Damn here I thought I could help but Yur and Nasty covered it pretty much.

Depending on how you like to drive and how much highway speeds you see then I would say 4.10s or 3.73s. I love my 4.10s but with my louder exhaust its a pain sometimes on the highway which I see hardly any of so im ok with them.

If you do drive on the highway once or twice a week I would say 3.73s. Your low end would pick up but the fuel mileage should be great. I can get about 20+ on the highway now but the city driving kills me. Its mostly my cams but the gears dont help.


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post #6 of 74 Old August 29th, 2011, 01:44 AM
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Why change gears?
Because race car!

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post #7 of 74 Old August 29th, 2011, 03:40 AM
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you'll love the 4.10's and they will also be fine on the highway and possibly improve city gas mileage.

w/ heads, cams, & 4.10's i was getting 18 city 21 highway. that's also with a 26" diameter tire which is smaller than stock so actually turning the wheels faster. if you're on stock height tires and since you don't have the other mods you may see better than that.

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post #8 of 74 Old August 29th, 2011, 03:49 AM
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Don't fear the gear. When I was learning about gears my dad told me this and I realized it made more sense to me. 3.73 means if you turn the driveshaft one the wheels turn three full turn and 3/4 but 4.10 is just over four times.

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post #9 of 74 Old August 29th, 2011, 06:31 AM Thread Starter
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Ok that's what I was thinking they do. I think I'm gonna throw 4.10s on it along with some 17s


2008 Mustang GT
-Pypes off road x-pipe
-Axle-back SLP Loudmouth
-4.10 Gears waiting to install
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post #10 of 74 Old August 29th, 2011, 07:27 AM
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You didn't mention auto or manual. Gears are especially good for people wanting max accelleration from a dead stop, that have the tires and suspension to hook up the power on tap. On my car with near stock engine, 1st gear will rarely hook up so the main advantage would be making 2nd gear lower. Also, changing ratios changes the spacing between the gears, making more of a close ratio transmission.

"back in the day" (im one of the old guys of this forum) many cars, especially autos had rediculously high gearing (low numerically). It wasn't uncommon to shift into 2nd at 60 mph. Combine that with a tight torque converter, and it makes for pretty sluggish takeoff. Our cars have much lower 1st gear so in my opinion not as much of an advantage. I've held off on gears because it seems like as is I"m already shifting out of 1st before I cross the intersection. But I'm thinking with lower gears I might be able to take off in 2nd without hurting the clutch.
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post #11 of 74 Old August 29th, 2011, 07:39 AM Thread Starter
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I own a stock 2008 GT which is a manual. After I install gears I think CAI and tune is next. Then a short throw shifter. Another question. Should I get my tune after I mod everything else that way it's tuned to what all mods I have installed. For instance; install gears, CAI, Short throw shifter, and wheels and then tune or what? Thanks


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-Pypes off road x-pipe
-Axle-back SLP Loudmouth
-4.10 Gears waiting to install
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post #12 of 74 Old August 29th, 2011, 08:11 AM
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Quote:
Originally Posted by napoleonpp View Post
I own a stock 2008 GT which is a manual. After I install gears I think CAI and tune is next. Then a short throw shifter. Another question. Should I get my tune after I mod everything else that way it's tuned to what all mods I have installed. For instance; install gears, CAI, Short throw shifter, and wheels and then tune or what? Thanks
You need a tune right away for the CAI. And you need to reprogram the speedo (which a handheld tuner will do) when you do the gears.

So just buy the handheld now

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post #13 of 74 Old August 29th, 2011, 08:13 AM
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Originally Posted by anothermustanguy View Post
Also, changing ratios changes the spacing between the gears, making more of a close ratio transmission.

.
Not to jump all over you, but that is just flat out wrong. Gear ratios are gear ratios. Changing the final drive, changes the final drive, it doesnt somehow get inside the transmission and change the gears, which is the only way you can change gear ratios inside the tranny.

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post #14 of 74 Old August 29th, 2011, 08:52 AM
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when you are shopping for a cai. do not even bother w/ one that doesn't require a tune. just do yourself a favor and go straight to a C&L or JLT.

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post #15 of 74 Old August 29th, 2011, 08:54 AM Thread Starter
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Ok so I guess I will just get the short throw shifter after the gears, CAI and tune. Should I get a tune after the short throw or is there no need for that?


2008 Mustang GT
-Pypes off road x-pipe
-Axle-back SLP Loudmouth
-4.10 Gears waiting to install
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post #16 of 74 Old August 29th, 2011, 09:04 AM
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the shifter has nothing to do with the tune.

when you get the cai/tune combo you are able to adjust the parameters for things like gear ratio, tire rotation (changes depending on tire height), rev limiter, speed limiter, ect...

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post #17 of 74 Old August 29th, 2011, 09:21 AM
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Quote:
Originally Posted by psycho bob View Post
when you are shopping for a cai. do not even bother w/ one that doesn't require a tune. just do yourself a favor and go straight to a C&L or JLT.
100% agree with that. I cant see any reason to buy one that doesnt require a tune. Sure, ok if you are at lowish mod levels, there wont be a power difference (I doubt there would be anyway), but why set up a possible future bottleneck, and there is a 99% chance you will buy a tuner anyway, so just get one that needs a tune (bigger)

I love the JLT, its the cheapest (at least I think it is) and its HUGE.

BAMA tune JLT CAI FRPP manifold J&M adj panhard bar/LCAs UMI LCA reloc brackets Eibach Prosystem GT500 strut tops Hot Rod Cams JBA LTs GT500 TB Meziere EWP FRRP 4.10
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post #18 of 74 Old August 29th, 2011, 09:48 AM
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Quote:
Originally Posted by wrathchild View Post
100% agree that......... its HUGE.
that's what she said

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Last edited by psycho bob; August 29th, 2011 at 09:53 AM.
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post #19 of 74 Old August 30th, 2011, 01:56 PM
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What about new gears (3.73) with a blower? I do not want to stay N/A for much longer and have been a little nervous about changing gears with the plan for a supercharger? I've heard that it won't hurt and then I've heard horror stories.
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post #20 of 74 Old August 30th, 2011, 02:20 PM
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From everything I have read. 3.73 is too much gear for a positive displacement blower, I would go like 3.55


But centrifugal blowers, 3.73/4.10 seems to be good.


This is just going off what I have read here.

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