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Old 01-09-2009, 03:26 PM   #1
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3.73 vs 4.10 gears

I see a lot of conflicting opinions on which gears to upgrade to.

For an every day driver 2008 GT manual in which gears would you recommend?

I am looking for performance upgrade but not at the expensive of significant wear and tear, as this is the first car I plan on keeping for more than 2 years.

Thank you in advance.
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Old 01-09-2009, 03:33 PM   #2
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Re: 3.73 vs 4.10 gears

neither will add wear and tear to the car...

Typically, it is recommended that you should go 3.73 with a manual, and 4.10 with an auto. It will really come down to personal preference.

I would suggest the 3.73's as they will keep you a little more reasonable RPM wise when running down the interstate at 70-80 mph. The 4.10's will put you over 3k rpms at that speed where as the 3.73's should keep you under that while still giving you a decent seat of the pants performance increase.
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Old 01-09-2009, 03:48 PM   #3
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Re: 3.73 vs 4.10 gears

Unless you are a hardass and dont mine the higher rpms/engine noise/drone/gas mileage drop go with 3.73s if manual
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Old 01-09-2009, 04:10 PM   #4
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Re: 3.73 vs 4.10 gears

3:73 I turn about 2,300 RPM at 70 MPH
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Old 01-09-2009, 05:00 PM   #5
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Re: 3.73 vs 4.10 gears

I am also looking into gears, and have faced the same question. I don't want a 3.73 because i feel its too close to the stock ratio and I'm not hardcore enough for 4.10. To me it seems that a 3.90 ratio would be perfect but I have heard bad things about them.
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Old 01-09-2009, 06:01 PM   #6
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Re: 3.73 vs 4.10 gears

Great info so far.

Do the gears void the warranty? Anyone have experience with this?
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Old 01-09-2009, 06:33 PM   #7
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Re: 3.73 vs 4.10 gears

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Great info so far.

Do the gears void the warranty? Anyone have experience with this?
Depends on who you deal with. If your dealership is "cool", they won't care unless it is directly related to the problem your having. But, yes it can.
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Old 01-09-2009, 08:38 PM   #8
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Re: 3.73 vs 4.10 gears

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neither will add wear and tear to the car...

Typically, it is recommended that you should go 3.73 with a manual, and 4.10 with an auto. It will really come down to personal preference.

I would suggest the 3.73's as they will keep you a little more reasonable RPM wise when running down the interstate at 70-80 mph. The 4.10's will put you over 3k rpms at that speed where as the 3.73's should keep you under that while still giving you a decent seat of the pants performance increase.
I have always read 3.73 for auto and 4.10 for manual. I have manual with 4.10s. at 80 MPH I am just under 3K.
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Old 01-09-2009, 08:44 PM   #9
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Re: 3.73 vs 4.10 gears

I love my 4.10s. My car is my D/D and I drive over 70 miles per. day 5 days. per. week. Don't worry about your mpg, overall mine stayed about the same.
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Old 01-10-2009, 08:44 AM   #10
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Re: 3.73 vs 4.10 gears

Just go with a 4.30 and say screw the driveability.

Trust me, you'll thank me the first time you launch.

But seriously...unless you have a 4V stay with a 4.10 or 3.73.
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Old 01-10-2009, 10:15 AM   #11
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Re: 3.73 vs 4.10 gears

It all depends on what YOU want. If you want as much acceleration as possible then get 4.10s. If you are going to penny pinch on the gas then get 3.73s. You know how you like to drive better than anyone else . . .
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Old 01-10-2009, 10:37 AM   #12
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Re: 3.73 vs 4.10 gears

the new gt's have an option from the factory (2010) for up to 3.73 *great idea if you ask me.

Thats where I would go all day long with a manual
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Old 01-13-2009, 11:28 AM   #13
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Exclamation Re: 3.73 vs 4.10 gears

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Originally Posted by gmantheman View Post
I have always read 3.73 for auto and 4.10 for manual. I have manual with 4.10s. at 80 MPH I am just under 3K.
Should be the other way around 4:10 for auto 3:73 manual
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Old 01-13-2009, 02:01 PM   #14
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Re: 3.73 vs 4.10 gears

^^ yea he had it reversed. Also keep in mind where you want to be at when at the track if you go to the track. That can help you determine what gear is better, you dont want to shift in the last little bit as it will hurt your times. You want to pull your gear and have it run out right as you pass the line.
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Old 01-13-2009, 03:29 PM   #15
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Re: 3.73 vs 4.10 gears

i also think it is a matter of preference, you should try to ride in someones car that has the gear ratios u are considering. it could be helpful. i drove my friends conver. fox wit 4.10 5 speed, i hated it. wit flowmater 40's @ 75mph i thought the car was gonna blow up! but i also know guys that drive 4.30 gear to work everyday and think it is the best thing since sliced bread. so it is definatly a matter of preference. i have 3.42's but im try'n to limit the low end torque cause i run a blower. in my opinion though, the more h.p. u have the less steep of a gear u need (on a daily driver), unless it is a "all out" race car with slicks, or u like fry'n the tires everytime u go wot.
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Old 01-13-2009, 10:47 PM   #16
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Re: 3.73 vs 4.10 gears

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i also think it is a matter of preference, you should try to ride in someones car that has the gear ratios u are considering. it could be helpful. i drove my friends conver. fox wit 4.10 5 speed, i hated it. wit flowmater 40's @ 75mph i thought the car was gonna blow up! but i also know guys that drive 4.30 gear to work everyday and think it is the best thing since sliced bread. so it is definatly a matter of preference. i have 3.42's but im try'n to limit the low end torque cause i run a blower. in my opinion though, the more h.p. u have the less steep of a gear u need (on a daily driver), unless it is a "all out" race car with slicks, or u like fry'n the tires everytime u go wot.
dude your scaring me lol im getting 410s next week and i got no cats and super 40 flows lol was it really that loud!?
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Old 01-14-2009, 12:01 AM   #17
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Re: 3.73 vs 4.10 gears

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dude your scaring me lol im getting 410s next week and i got no cats and super 40 flows lol was it really that loud!?
im not tryn to scare you. you may very well like it. you see there are mixed opinions. for me, light to light city drive'n is awsome with a 4.10. but im not sure how practical it is for a car that gets highway use. also, keep in mind we had the top down in his car...lol. so it probaby seemed louder than what it would in a hard top..i imagine. however, if your motor is mostly stock, u will definatley love 4.10's at least in the city. dont take my word for it though, it's just an opinion.... u should keep askn around or do wut i suggested with some ride alongs in other ppl's cars if possible
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Old 01-14-2009, 09:38 AM   #18
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Re: 3.73 vs 4.10 gears

considering that i have a v6 i have been told to go with 410s and its an auto. yah if you had the top down that makes a big diffrence, just having my windows open makes a diffrence lol

thanks
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Old 01-14-2009, 09:40 AM   #19
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Re: 3.73 vs 4.10 gears

you most likely will love the 4.10's on a v6.
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Old 01-14-2009, 10:25 AM   #20
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Re: 3.73 vs 4.10 gears

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considering that i have a v6 i have been told to go with 410s and its an auto. yah if you had the top down that makes a big diffrence, just having my windows open makes a diffrence lol

thanks
with a auto you'll be fine with 4:10 due to the trans gearing

Auto--3.250:1 first gear ratio, 2.440:1 second gear ratio, 1.550:1 third gear ratio, 1.000:1 fourth gear ratio, 0.750:1 fifth gear ratio and 3.070:1

Manual--- 3.750:1 first gear ratio, 2.190:1 second gear ratio, 1.410:1 third gear ratio, 1.000:1 fourth gear ratio, 0.720:1 fifth gear ratio
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Old 01-14-2009, 10:27 AM   #21
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Re: 3.73 vs 4.10 gears

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with a auto you'll be fine with 4:10 due to the trans gearing

Auto--3.250:1 first gear ratio, 2.440:1 second gear ratio, 1.550:1 third gear ratio, 1.000:1 fourth gear ratio, 0.750:1 fifth gear ratio and 3.070:1

Manual--- 3.750:1 first gear ratio, 2.190:1 second gear ratio, 1.410:1 third gear ratio, 1.000:1 fourth gear ratio, 0.720:1 fifth gear ratio
ohhhh, he has the 5spd. auto right?
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Old 01-14-2009, 10:44 AM   #22
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Re: 3.73 vs 4.10 gears

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ohhhh, he has the 5spd. auto right?
44L 4-Speed Automatic Transmission|V6 CO
Automatic five-speed transmission with lock-up, electronic control, shift lever on floor, 3.250:1 first gear ratio, 2.440:1 second gear ratio, 1.550:1 third gear ratio, 1.000:1 fourth gear ratio, 0.750:1 fifth gear ratio and 3.070:1 reverse gear ratio 5R55S; Fuel economy EPA highway (mpg): 25 and EPA city (mpg): 19; Weights: curb weight (lbs) 3386; Automatic drive indicator on dashboard; Standard on Prem Conv for Fleet orders; Excludes: [44F] 5-Speed Manual Transmission
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Old 01-14-2009, 11:09 AM   #23
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Re: 3.73 vs 4.10 gears

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44L 4-Speed Automatic Transmission|V6 CO
Automatic five-speed transmission with lock-up, electronic control, shift lever on floor, 3.250:1 first gear ratio, 2.440:1 second gear ratio, 1.550:1 third gear ratio, 1.000:1 fourth gear ratio, 0.750:1 fifth gear ratio and 3.070:1 reverse gear ratio 5R55S; Fuel economy EPA highway (mpg): 25 and EPA city (mpg): 19; Weights: curb weight (lbs) 3386; Automatic drive indicator on dashboard; Standard on Prem Conv for Fleet orders; Excludes: [44F] 5-Speed Manual Transmission
and it will be 19hwy with 4.10's?
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Old 01-14-2009, 11:53 AM   #24
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Re: 3.73 vs 4.10 gears

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and it will be 19hwy with 4.10's?
Why don't you research that ? Might give you something useful to do
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Old 01-14-2009, 01:44 PM   #25
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Re: 3.73 vs 4.10 gears

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and it will be 19hwy with 4.10's?
Easily. With about 85%hwy and 15% city I am getting around 19MPG. On the hwy driving 75-85 I am getting 24-25MPG.
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Old 01-14-2009, 04:38 PM   #26
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Re: 3.73 vs 4.10 gears

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Easily. With about 85%hwy and 15% city I am getting around 19MPG. On the hwy driving 75-85 I am getting 24-25MPG.
nice, its a win win situation lol
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Old 01-14-2009, 05:08 PM   #27
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Re: 3.73 vs 4.10 gears

wut was i thinkn? i shoulda went wit a 4.56 based on that...lol. just kidding. he will most likeky like the gear though.
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Old 01-15-2009, 08:09 AM   #28
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Re: 3.73 vs 4.10 gears

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nice, its a win win situation lol
You 'll love'em !!! Did you get the 5 sp auto ??? I could not find any final gears ratio for the 4 sp auto
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Old 01-15-2009, 02:36 PM   #29
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Re: 3.73 vs 4.10 gears

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You 'll love'em !!! Did you get the 5 sp auto ??? I could not find any final gears ratio for the 4 sp auto
to be honest withyou i dont know. its an 05 v6 mustang. i think its 5 gears, but im not positive on that. pretty sad i should know! lol

yah im looking forward to the gears! it wasnt easy to find the 410s for a 7.5 rear either. im getting them from yukon gears.
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Old 01-16-2009, 06:22 AM   #30
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Re: 3.73 vs 4.10 gears

I have 3:73, I might go to 4:1 this summer, not quite what I expected. I want a little more..
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Old 01-16-2009, 07:53 AM   #31
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Re: 3.73 vs 4.10 gears

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to be honest withyou i dont know. its an 05 v6 mustang. i think its 5 gears, but im not positive on that. pretty sad i should know! lol

yah im looking forward to the gears! it wasnt easy to find the 410s for a 7.5 rear either. im getting them from yukon gears.
seriously?... i thought ford racing offered a gear for that. most of the ratios available for 8.8. are available for 7.5. not all...but most. i have a 7.5, so like u i was definatley look'n, which i ended up leaving the stock 3.42 and just put in a new trac-lok.
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Old 01-16-2009, 08:33 AM   #32
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Re: 3.73 vs 4.10 gears

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seriously?... i thought ford racing offered a gear for that. most of the ratios available for 8.8. are available for 7.5. not all...but most. i have a 7.5, so like u i was definatley look'n, which i ended up leaving the stock 3.42 and just put in a new trac-lok.
yah belive it or not, ford does NOT make it for the 7.5 rear end once again we were left out like the lepards of mustangs. the mustang outcasts. lol i only found two companies. motive and yukon. they are the only once.
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Old 01-16-2009, 09:40 AM   #33
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Re: 3.73 vs 4.10 gears

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seriously?... i thought ford racing offered a gear for that. most of the ratios available for 8.8. are available for 7.5. not all...but most. i have a 7.5, so like u i was definatley look'n, which i ended up leaving the stock 3.42 and just put in a new trac-lok.
Yeah, like was said above, ford stopped making gears for the 7.5". You're left with motive and yukon as a choice now. Ford does still provide the t-lok though.
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Old 01-16-2009, 11:14 AM   #34
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Re: 3.73 vs 4.10 gears

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Yeah, like was said above, ford stopped making gears for the 7.5". You're left with motive and yukon as a choice now. Ford does still provide the t-lok though.
thank god atleast they do that much! thats the one part i bought aftermarket that says ford on it lol
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Old 01-18-2009, 12:29 AM   #35
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Re: 3.73 vs 4.10 gears

With a man and 4.10s with at 70 your RPMS would be just under 2400. With an auto and 4.10s at 70 your RPMS would be just under 2600. On the other hand with 3.73s and an auto at 70 your RPMS would be about 2300-2400.
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