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Old 10-22-2013, 02:48 PM   #1
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thoughs on 390 gears?

i wana buy gears im thinking 390s any thiughts for a 13 5.0 track apps autmatic?
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Old 10-22-2013, 02:57 PM   #2
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Usually people with autos go with 4.10s but it's really up to you
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Old 10-22-2013, 03:01 PM   #3
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As long as you go FRPP(ford racing performance parts) you will be good.
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Old 10-22-2013, 03:02 PM   #4
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^^ +1 heard a lot of good things about them, that's what I will be going with
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Old 10-22-2013, 03:04 PM   #5
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The 3.90s usually whine a lot
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Old 10-22-2013, 03:37 PM   #6
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Usually people with autos go with 4.10s but it's really up to you
You mean the uneducated people?

I say stick with your stock gears. What other mods have you done? What is your intended usage of the car?
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Old 10-22-2013, 03:43 PM   #7
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You mean the uneducated people? I say stick with your stock gears. What other mods have you done? What is your intended usage of the car?
I mean I wouldn't call them uneducated.... If that is what a person wants to do to there car they can. It sounds like he already has his mind set on the gears. But i understand that there is things you should think about before getting gears.
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Old 10-22-2013, 03:52 PM   #8
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I mean I wouldn't call them uneducated.... If that is what a person wants to do to there car they can. It sounds like he already has his mind set on the gears. But i understand that there is things you should think about before getting gears.
But you have to be very careful when giving advice. You suggested people go with 4.10's usually but that's actually not true. Do you actually own a 2011+ GT with the auto?
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Old 10-22-2013, 03:55 PM   #9
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But you have to be very careful when giving advice. You suggested people go with 4.10's usually but that's actually not true. Do you actually own a 2011+ GT with the auto?
If you read the post I did not recommend him anything I just stated what I have heard other people go with. And at the end of my post I stated it was really up to him on what he should do.
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Old 10-22-2013, 08:08 PM   #10
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its an automatic with roush intake and i wana switch the gears idk which ones i have my car is a 2013 5.0 gt premuim track app
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Old 10-22-2013, 08:59 PM   #11
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its an automatic with roush intake and i wana switch the gears idk which ones i have my car is a 2013 5.0 gt premuim track app
You probably have 3.31. Call the dealer
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Old 10-22-2013, 09:25 PM   #12
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The fastest autos in the country. Are all running 3.31's.
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Old 10-22-2013, 09:28 PM   #13
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Maybe OP doesn't want a ton of power... Maybe he just wants a little more get up and go. If so then the best choice for him would be 3.73s
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Old 10-22-2013, 10:18 PM   #14
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its an automatic with roush intake and i wana switch the gears idk which ones i have my car is a 2013 5.0 gt premuim track app
Dude, just check your driver side door jam...here are the axle ratio codes.

BB - 3.73 ratio
CC - 2.73 ratio
DD - 3.55 ratio
GG - 3.31 ratio
YY - 3.15 ratio
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Old 10-22-2013, 10:21 PM   #15
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Crawl your *** under the car and look at the diff. It will tell you what gears you have.
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Old 10-22-2013, 10:46 PM   #16
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Crawl your *** under the car and look at the diff. It will tell you what gears you have.
Ha...yea that'll work too.
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Old 10-22-2013, 10:52 PM   #17
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FYI, mine didn't say on the pumpkin... Got the axle code off the door which was GG FOR 3.31. So jacked up the car, marked the drive shaft , spun the wheels full rotation and yep , driveshaft went bout 3.31 turns so no gear swap in there......
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Old 10-23-2013, 04:56 AM   #18
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its an automatic with roush intake and i wana switch the gears idk which ones i have my car is a 2013 5.0 gt premuim track app
Automatics come with 3.15's.
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You probably have 3.31. Call the dealer
See above.
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The fastest autos in the country. Are all running 3.31's.
Yep. Matched with a 28" tire.
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Maybe OP doesn't want a ton of power... Maybe he just wants a little more get up and go. If so then the best choice for him would be 3.73s
Any experience here? How are you basing your answer?
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Old 10-24-2013, 08:49 AM   #19
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Depends on what size tire you want to run...taller gear with stock tire height won't net any gains. At least not within a significant tolerance to show reputable gains. If you plan to go taller tire, 3.31.
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Old 10-24-2013, 01:38 PM   #20
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Automatics come with 3.15's. See above. Yep. Matched with a 28" tire. Any experience here? How are you basing your answer?
Nice response, grabber. This forum has too much rumor advice than real knowledge.
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Old 10-25-2013, 03:37 AM   #21
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Automatics come with 3.15's. See above. Yep. Matched with a 28" tire. Any experience here? How are you basing your answer?
Pretty simple really. Gears make you accelerate faster. Yes a higher stall torque converter will help 1/4 mile times more than gears but what if that's not what he is looking for.

Everyone on here gets so caught up in having the fastest 1/4 time that they forget to ask the OP what they want out of the car performance wise.
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Old 10-25-2013, 04:46 AM   #22
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Pretty simple really. Gears make you accelerate faster. Yes a higher stall torque converter will help 1/4 mile times more than gears but what if that's not what he is looking for.

Everyone on here gets so caught up in having the fastest 1/4 time that they forget to ask the OP what they want out of the car performance wise.
The 6 speed Trans has ratios built into it to assist take off in 1-2nd gear and the gears get taller as they increase. That's why the ford engineers decided 3:15s were a solid choice for decent off the line acceleration and highway cruising rpms. His rpms will be significantly higher going from 3:15 to 3:90.

The better question here is why he feels he needs gears done to his car.
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Old 10-25-2013, 04:49 AM   #23
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Cool For what purpose +1

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Ha...yea that'll work too.
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Originally Posted by Soccerluvr4 View Post
Pretty simple really. Gears make you accelerate faster. Yes a higher stall torque converter will help 1/4 mile times more than gears but what if that's not what he is looking for.

Everyone on here gets so caught up in having the fastest 1/4 time that they forget to ask the OP what they want out of the car performance wise.
I agree, is the op tracking the pony or drag or just enjoying the twisty's? It's all in the usage of the car.
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Old 10-25-2013, 04:58 AM   #24
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What is your intended usage of the car?
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Originally Posted by Soccerluvr4 View Post
Pretty simple really. Gears make you accelerate faster. Yes a higher stall torque converter will help 1/4 mile times more than gears but what if that's not what he is looking for.

Everyone on here gets so caught up in having the fastest 1/4 time that they forget to ask the OP what they want out of the car performance wise.
Ahh, but I did ask him what his intended usage was. And you won't be accelerating faster if your tires are just spinning.
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The 6 speed Trans has ratios built into it to assist take off in 1-2nd gear and the gears get taller as they increase. That's why the ford engineers decided 3:15s were a solid choice for decent off the line acceleration and highway cruising rpms. His rpms will be significantly higher going from 3:15 to 3:90.

The better question here is why he feels he needs gears done to his car.
Someone gets it.
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Old 10-25-2013, 01:41 PM   #25
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We still don't know if he drives all highway or city miles. If it's all highway and he still wants gears that means it's probably because he likes dropping gears and passing cars.

I'm just trying to bring out all the variables so we know what's best for him.
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Old 10-25-2013, 05:40 PM   #26
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We still don't know if he drives all highway or city miles. If it's all highway and he still wants gears that means it's probably because he likes dropping gears and passing cars. I'm just trying to bring out all the variables so we know what's best for him.
Nope, highway driving/downshifting still a win for 3.15s...these trans are not setup like autos of the past.

Again, only reason to change gear is to accommodate the change in tire height. If you don't want to void warranty, get procal before gears.
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Old 10-25-2013, 06:46 PM   #27
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Ok.... I guess we should tell Ford they are idiots to offer a 3.73 gear option, apparently it's useless. But whatever.
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Old 10-25-2013, 07:03 PM   #28
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You must be referring to MT-82. The only guy I've seen run a 3.73 in auto is my buddy and that's ONLY because he's running a 29" tire.
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Old 10-25-2013, 07:07 PM   #29
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Ok.... I guess we should tell Ford they are idiots to offer a 3.73 gear option, apparently it's useless. But whatever.
They don't offer 3.73's in the autos now do they? That's what this discussion is about. Not the manual.
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Old 10-25-2013, 08:03 PM   #30
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They don't offer 3.73's in the autos now do they? That's what this discussion is about. Not the manual.
And for what it's worth, having 3:73s in the manual isn't worth the money to swap them out either. My car has 3:31s and has been 12s more than once with no bolt ons
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Old 10-27-2013, 03:09 PM   #31
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I had 3.73 gears in an auto. I did have a 28 inch tire in the rear though. It felt substantially faster off the line. I could care less my quarter mile times though.
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Old 10-27-2013, 04:10 PM   #32
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I had 3.73 gears in an auto. I did have a 28 inch tire in the rear though. It felt substantially faster off the line. I could care less my quarter mile times though.
Out of curiosity, what are your times?
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Old 10-27-2013, 04:31 PM   #33
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Out of curiosity, what are your times?
Mid 11's. I dont frame my time slips on my living room wall so I dont have slips to show you.
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Old 10-27-2013, 05:23 PM   #34
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Mid 11's. I dont frame my time slips on my living room wall so I dont have slips to show you.
Mid 11's huh? Interesting. What mods do you have to get those times?
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Old 10-27-2013, 06:29 PM   #35
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