3.55 vs 3.73 vs 3.31 Automatic - Mustang Evolution

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Old 05-10-2013, 06:28 PM   #1
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3.55 vs 3.73 vs 3.31 Automatic

I want this thread to be focused just on the 2011 & up auto trannys.
Too many manuals threads are confusing those with automatics.
Which is better and why? Hope this thread is useful for those seeking the right answers.
From my research
3.31 is for future f/i or turbo
3.55 want a great start but you do a lot of highway driving, so better mpg
3.73 better city mpg and great launch, ideal for those running 20s

Please if i am wrong correct me!
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Old 05-10-2013, 06:43 PM   #2
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Nice little write up, i have manual but i know its confusing for those with auto.
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Old 05-10-2013, 06:43 PM   #3
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If your not obsessed with top speed, I would do 3.73 or 4.10.
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Old 05-10-2013, 06:46 PM   #4
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I'd put a bull gear in it.
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Old 05-10-2013, 07:04 PM   #5
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this is assuming a 27" tall tire and hitting redline at 6900.

A manual 5.0 with 3.73 in first gear will hit 40mph.

an auto 5.0 with 3.31 in first gear will hit 40mph.

an auto 5.0 with 3.31 in second gear will hit 71mph.

a manual 5.0 with 3.73 in second gear will hit 61mph

now if for the auto with 3.73 to compare.

first gear = 35mph

second gear = 63mph.

now for the manual with 3.31 to compare.

first gear = 45mph.

second gear = 68mph
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Old 05-10-2013, 09:11 PM   #6
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if only it was as easy as saying "pick one of these 3 gears for your auto"

auto gears depend so much on what your doing with the car & wanting to get out of the car, there are no one size fits all combo's out there.

just using the three mentioned, if you drag race at the track & you want to get the most out of a mild n/a- d/d style build (most cars will fit this category) 3.55's & 3.73's are out since they will have you going accross in the middle of third & show no real gains.

3.31's may pick up .05-.10 but hardly worth the price.

an auto gear thread IMO, needs to start with "what do you want to get out of your car" more than which gear to pick.

that said, if the person never, ever has plans of going to the track or f/i, go 3.73's.

like stated above (but I would tell the person to do gears last in this case) 3.31's will be good if your doing f/i soon.
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Old 05-10-2013, 10:51 PM   #7
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Originally Posted by casper gt View Post
if only
that said, if the person never, ever has plans of going to the track or f/i, go 3.73's.

.
So your saying 3.73 are not good for the strip? so what would be in your opnion the best gear for a well built (suspension,, tires, boltons) n/a stang?
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Old 05-10-2013, 10:55 PM   #8
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that said, if the person never, ever has plans of going to the track or f/i, go 3.73's.
The track pack comes with 3.73's
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Old 05-10-2013, 10:58 PM   #9
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The track pack comes with 3.73's
how does this help? Track pack only comes in a manual trannie. They are talking about autos here.
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Old 05-10-2013, 10:59 PM   #10
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how does this help? Track pack only comes in a manual trannie. They are talking about autos here.
I won't even edit my comment, so I can learn my lesson.
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Old 05-10-2013, 11:00 PM   #11
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Originally Posted by OzzyLiriano View Post
So your saying 3.73 are not good for the strip? so what would be in your opnion the best gear for a well built (suspension,, tires, boltons) n/a stang?
from what I posted seems like 3.31 really are best. Will take off like 3.73 gears on a manual but has a slightly taller second gear that gets it to a higher mph at the top of 2nd gear than a manual 3.73

this is just going by the numbers. Not having ever driven an auto mustang I have no idea how bad 3.73 would really be on an auto, but since they would be worse than 4.10 on a manual for first gear, I wouldn't think they'd be that great. Your going to be out of first gear before you even realize you hit the gas pedal haha.

below is 1st gear only.
auto with 4.10 will hit 6900RPM with 27" tall tire at 32 MPH.
auto with 3.73 same as above will hit 35

manual with 4.10 will hit 37
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Old 05-11-2013, 12:05 AM   #12
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Originally Posted by OzzyLiriano View Post
So your saying 3.73 are not good for the strip? so what would be in your opnion the best gear for a well built (suspension,, tires, boltons) n/a stang?

I'm not really saying they are a disaster but with 3.73's & the typical 27"+ tire most folks use on these cars, 3.73's will have you going across the finish line in the high 5k rpms/low 6k rpms, far from where you need to be.

if the car has a stock converter, well built as you outlined above, either leave the stock 3.15's in the car & give up the 60'/run & high 11's or 4.10's, 60' as good as a stock converter car can (very low 1.8's) & run mid 11's.
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Old 05-11-2013, 12:28 AM   #13
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Quote:
Originally Posted by OzzyLiriano View Post
I want this thread to be focused just on the 2011 & up auto trannys.
Too many manuals threads are confusing those with automatics.
Which is better and why? Hope this thread is useful for those seeking the right answers.
From my research
3.31 is for future f/i or turbo
3.55 want a great start but you do a lot of highway driving, so better mpg
3.73 better city mpg and great launch, ideal for those running 20s

Please if i am wrong correct me!
I have a 2011 v6 automatic and installed 3:73 gears. I just have the stock 17 inch tires and freaking love my new gears. In my opinion, the 3:73 gears are the way to go. I drive 99 % highway and am getting around 26 mpg . Assuming I can keep my foot from working that gas pedal like a stripper working a pole for tips. Traveling 80 mph, I am around 2700 rpm's give or take some. lol. It's not a digital rpm display so its hard to get an exact reading. The car shoots off hard from a dead stop and get very little to no tire spin on dry surfaces. Just from my own personal experience of having 3:73 gears, I say that's the way to go. I don't track my car but I still ride her the way a pony needs to be driven. Just my 2 cents.
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Old 05-11-2013, 12:38 AM   #14
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I just installed 4.10 about 3 weeks ago and love them. If you don't go with 4.10 just leave it stock, MO

80 Mph = 2600-2700 RPM on the highway.
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Old 05-11-2013, 12:47 AM   #15
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I have a 2011 v6 automatic and installed 3:73 gears. I just have the stock 17 inch tires and freaking love my new gears. In my opinion, the 3:73 gears are the way to go. I drive 99 % highway and am getting around 26 mpg . Assuming I can keep my foot from working that gas pedal like a stripper working a pole for tips. Traveling 80 mph, I am around 2700 rpm's give or take some. lol. It's not a digital rpm display so its hard to get an exact reading. The car shoots off hard from a dead stop and get very little to no tire spin on dry surfaces. Just from my own personal experience of having 3:73 gears, I say that's the way to go. I don't track my car but I still ride her the way a pony needs to be driven. Just my 2 cents.
sorry bud, my references are geared toward coyote cars, I have no idea what a 6er may or may not respond to.

I just assumed since we were having this conversation in the v8/GT section, v8/GT auto info was needed.
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Old 05-11-2013, 01:02 AM   #16
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Originally Posted by casper gt View Post

sorry bud, my references are geared toward coyote cars, I have no idea what a 6er may or may not respond to.

I just assumed since we were having this conversation in the v8/GT section, v8/GT auto info was needed.
Don't worry. The sixxers do this all the time. Come in here and give engine advice on something they have never driven or modded.

I mean my tundra with the iForce V8 has 3.91 gears and is a 6 speed auto so I think 3.91 would be great in an auto 5.0 mustang. Gets my 6500 lb truck moving pretty fast.
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Old 05-11-2013, 01:26 AM   #17
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Originally Posted by casper gt View Post

sorry bud, my references are geared toward coyote cars, I have no idea what a 6er may or may not respond to.

I just assumed since we were having this conversation in the v8/GT section, v8/GT auto info was needed.
Actually that's good info for you, it's all ratio you're just adding 25 percent power

---------- Post added at 01:26 AM ---------- Previous post was at 01:25 AM ----------

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Don't worry. The sixxers do this all the time. Come in here and give engine advice on something they have never driven or modded.

I mean my tundra with the iForce V8 has 3.91 gears and is a 6 speed auto so I think 3.91 would be great in an auto 5.0 mustang. Gets my 6500 lb truck moving pretty fast.
WHAT!? Lmfao "screw the v6 mustang guys advice, let me tell you what my Japanese truck does..."

By the way gears aren't engine advice
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Old 05-11-2013, 01:38 AM   #18
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Actually that's good info for you, it's all ratio you're just adding 25 percent power

---------- Post added at 01:26 AM ---------- Previous post was at 01:25 AM ----------



WHAT!? Lmfao "screw the v6 mustang guys advice, let me tell you what my Japanese truck does..."

By the way gears aren't engine advice
Gears are engine advice in the sense that a V6 just won't have the same torque output a V8 will and having the same gears on the two different engines will produce different results even though the trannies have the same gears. That was all I was really getting at. Haha.
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Old 05-11-2013, 02:15 AM   #19
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Originally Posted by nosympathy View Post

Don't worry. The sixxers do this all the time. Come in here and give engine advice on something they have never driven or modded.

I mean my tundra with the iForce V8 has 3.91 gears and is a 6 speed auto so I think 3.91 would be great in an auto 5.0 mustang. Gets my 6500 lb truck moving pretty fast.
Haha you crack me up bro! Almost like their a different breed lol
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Old 05-11-2013, 02:30 AM   #20
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Haha you crack me up bro! Almost like their a different breed lol
probably gonna get yelled at for that comment, but I just don't get it. Completely different engines and exhaust setup and yet they come in here all the time and tell people what makes their sixxer sound good or what mods worked well for their car. Somedays i feel like i should go in the sixxer forum and tell them how much the boss mani improved my car and how they should get one....wait...

and sorry, done derailing.
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Old 05-11-2013, 02:59 AM   #21
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Haha yea I know what ya mean just made me chuckle lol
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Old 05-11-2013, 03:36 AM   #22
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I posted this thread to kill this subject for those always looking for an answer, i appreciate the inputs, but all this sixxer or tundra stuff has to stop, auto mustangs only, unless you have some time of topic opinion.
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Old 05-11-2013, 06:05 AM   #23
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Ozzy, do you ever plan to run a converter? The 3.31's don't make of a difference unless you go with a converter. That will change things a lot. Also how is the car used mainly? Are track times really important or are you just looking for a fun car on the street? Me personally I'm going with a converter and sticking with my 3.15's. I've had many different gear combos over the years including 4.30's in my Mach1 and sometimes more isn't better. One more thing is the tire size. I see 27" tires mentioned but the majority of the sizes out there are closer to 28" I believe.

And as far as the sixxer guys coming on here giving feedback please don't. It's not an apples to apples comparison so just stop.
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Old 05-11-2013, 06:10 AM   #24
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That was me using 27" and it was just to have a static number for tire size when showing the difference in the gears between an auto and a manual to point out 3.31 in an auto are closer to 3.73 in a manual.

I could have picked a 3" tire size and the point would have been the same. My bad though should have just used 28.
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Old 05-11-2013, 06:20 AM   #25
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I copied and pasted this courtesy of Kris Danner from another forum that helps explain the already steep 1st gear in our autos. Anyone that has used a C4 transmission over the years would agree that a 5.61 rear gear would have been too much. Well 4.10's in these cars is the equivalent. The Mach 1's had the 4R70W transmission among others but no one put 4.86 rear gears in. 4.10's would be the same. I realize 4.10's weren't one of your options but you can do the math with 3.73's. So when you see guys just throwing out numbers one can understand that they don't truly understand what they are talking about. (Not directed at you Larry)


C4 - 2.46
4R70W - 2.84
6R80 - 4.17

Take the 4.17 and multiply it by the 3.31, you get 13.8 for an overall gear ratio in 1st. Now take that 13.8 and divide it by the first gear ratios of the other transmissions and this tells you what axle ratio would give you the equivalent with those transmissions:

C4 - 5.61
4R70W - 4.86

So, although 3.31 "sounds like" not much gear, you can see that in the end, it is quite a bit of gear with the 6R80.

We can do the same with the second gear ratios:

6R80 - 2.34
C4 - 1.46
4R70W - 1.55

That puts the 6R80/3.31 at 7.75, which is like a 4R70W with a 5.00 axle, or a C4 with a 5.31 axle.

And finally 3rd gear, where the 6R80 is 1.52*3.31=5.03, the others are 1 to 1, so 5.03 would be the equivalent axle there.


You'd all agree that an axle in the 5.00 range is a lot of gear, well, we're doing exactly the same thing with the 3.31/6R80, we just have 3 more gears to go after that.


Going the other way, a 4.10/6R80 in first gear is like having a C4 with a 6.95 gear, or a 4R70W with a 6.02 gear. You can see why hooking it is a problem. __________________

---------- Post added at 07:20 AM ---------- Previous post was at 07:18 AM ----------

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That was me using 27" and it was just to have a static number for tire size when showing the difference in the gears between an auto and a manual to point out 3.31 in an auto are closer to 3.73 in a manual.

I could have picked a 3" tire size and the point would have been the same. My bad though should have just used 28.
I understand and I was pointing out who or what. Just trying to simplify things.
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Old 05-11-2013, 09:39 AM   #26
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sorry bud, my references are geared toward coyote cars, I have no idea what a 6er may or may not respond to.

I just assumed since we were having this conversation in the v8/GT section, v8/GT auto info was needed.
My mistake. Sorry. I missed this was for v8 section. My bad.
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Old 05-11-2013, 10:38 AM   #27
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Originally Posted by Grabber Blue5.0 View Post
Ozzy, do you ever plan to run a converter? The 3.31's don't make of a difference unless you go with a converter. That will change things a lot. Also how is the car used mainly? Are track times really important or are you just looking for a fun car on the street? Me personally I'm going with a converter and sticking with my 3.15's. I've had many different gear combos over the years including 4.30's in my Mach1 and sometimes more isn't better. One more thing is the tire size. I see 27" tires mentioned but the majority of the sizes out there are closer to 28" I believe.

And as far as the sixxer guys coming on here giving feedback please don't. It's not an apples to apples comparison so just stop.
Im debating about getting a converter, im planning to keep the car aslong as i can, I want it to run 11 n/a...but in the very farrrr future I am planning to go fi, 10 years from now so let's scratch that off.... my car is the luxury option I have if u want to put it like that, I don't have plans of making a super drag car, but I really enjoy my car and I want it to be as fast as my budget can take me...I'm in no hurry but I like to do things right, in my opnion and most ppl that see my car I did agreat job with the exterior, now I would like to imply the same to my engine......I want to ask you some questions, maybe we continue in the messager thing here...what tire/ rim setup are you using, and why are you choosing to stay 3.15?
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Old 05-11-2013, 11:12 AM   #28
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Dude seriously get 4.10 you will love them. I think I'm the only one that poster in this thread that has a 2013 auto like your car. When u go FI just change them out. Your car is a dd why in the world would you want to change out the converter. I have first hand experience with the 13 auto with 4.10 or just listen to the guys that know every thing.

The 4.10 in sport mode which I think only the 13-14 auto has is very aggressive. Your car will drive and sound like a manual.
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Old 05-11-2013, 12:35 PM   #29
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Dude seriously get 4.10 you will love them. I think I'm the only one that poster in this thread that has a 2013 auto like your car. When u go FI just change them out. Your car is a dd why in the world would you want to change out the converter. I have first hand experience with the 13 auto with 4.10 or just listen to the guys that know every thing.

The 4.10 in sport mode which I think only the 13-14 auto has is very aggressive. Your car will drive and sound like a manual.
I have a 2013 auto as well and I agree. I've got 3.73 gears though. Op...your not going to like the converter if its your dd. my brother has circle d converter and it sucks in traffic. It's not for everyone.
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Old 05-11-2013, 02:23 PM   #30
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I have a 2013 auto as well and I agree. I've got 3.73 gears though. Op...your not going to like the converter if its your dd. my brother has circle d converter and it sucks in traffic. It's not for everyone.
+1^
a converter isn't for everyone, certainly not for someone who just want's to get into the 11's but doesn't want to have aa purpose built drag car or set any records.

as to compairing these tranny's to others on paper, it doesn't translate well into the real world.

basically, there are only a few choices of gears that make sence with the typical tires run on these cars (ie. 27"-28") stock 3.15's, 3.31's, 4.10's, 4.30's & 4.56's.

all those are mod/end use dependent but 3.27's, 3.55's, 3.73's & 3.90's all leave something on the table somewhere & IMO shouldn't be used.

there is quite a bit of misinformation floating around about the steep 1st gear in 6r80's, but with the propper tires on a well prepped track, you should have no problem with any of the gears I mentioned.
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Old 05-11-2013, 02:31 PM   #31
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I copied and pasted this courtesy of Kris Danner from another forum that helps explain the already steep 1st gear in our autos. Anyone that has used a C4 transmission over the years would agree that a 5.61 rear gear would have been too much. Well 4.10's in these cars is the equivalent. The Mach 1's had the 4R70W transmission among others but no one put 4.86 rear gears in. 4.10's would be the same. I realize 4.10's weren't one of your options but you can do the math with 3.73's. So when you see guys just throwing out numbers one can understand that they don't truly understand what they are talking about. (Not directed at you Larry)


C4 - 2.46
4R70W - 2.84
6R80 - 4.17

Take the 4.17 and multiply it by the 3.31, you get 13.8 for an overall gear ratio in 1st. Now take that 13.8 and divide it by the first gear ratios of the other transmissions and this tells you what axle ratio would give you the equivalent with those transmissions:

C4 - 5.61
4R70W - 4.86

So, although 3.31 "sounds like" not much gear, you can see that in the end, it is quite a bit of gear with the 6R80.

We can do the same with the second gear ratios:

6R80 - 2.34
C4 - 1.46
4R70W - 1.55

That puts the 6R80/3.31 at 7.75, which is like a 4R70W with a 5.00 axle, or a C4 with a 5.31 axle.

And finally 3rd gear, where the 6R80 is 1.52*3.31=5.03, the others are 1 to 1, so 5.03 would be the equivalent axle there.


You'd all agree that an axle in the 5.00 range is a lot of gear, well, we're doing exactly the same thing with the 3.31/6R80, we just have 3 more gears to go after that.


Going the other way, a 4.10/6R80 in first gear is like having a C4 with a 6.95 gear, or a 4R70W with a 6.02 gear. You can see why hooking it is a problem. __________________

---------- Post added at 07:20 AM ---------- Previous post was at 07:18 AM ----------


I understand and I was pointing out who or what. Just trying to simplify things.
hooking a problem with 4.10's, lol, mabie for some............

heres 4.10's with a 5c converter, do you see a problem?


heres some videos of a mild street build without a converter


& after a mild converter


those are just to give you an Idea of a stock geared car.
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Old 05-11-2013, 02:43 PM   #32
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Originally Posted by OzzyLiriano View Post
I want to ask you some questions, maybe we continue in the messager thing here...what tire/ rim setup are you using, and why are you choosing to stay 3.15?
We can take it to PM's if you like. My wheels are Weld RT-S 15x10's in the rear with M/T 295/55-15's and in the front I'm running 17x5 with Hoosier front runners. I've been 11's already with my stock 3.15's and stock converter so I know neither is needed.
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Old 05-11-2013, 02:50 PM   #33
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Originally Posted by casper gt View Post

there is quite a bit of misinformation floating around about the steep 1st gear in 6r80's, but with the propper tires on a well prepped track, you should have no problem with any of the gears I mentioned.
The information is what it is with 1st gear. The numbers don't lie. Sure with the proper tires anything can hook.
And it's "proper."
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Originally Posted by casper gt View Post
hooking a problem with 4.10's, lol, mabie for some............
It's spelled "maybe."

You cannot compare your car to others.
A. You have a speed shop helping you.
B. You're on E85 which is not available to everyone or not everyone is available to use.
C. You have lightweight body parts and seats removed. You have to give the full story when you're telling it.
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Old 05-11-2013, 03:03 PM   #34
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Originally Posted by Grabber Blue5.0 View Post
The information is what it is with 1st gear. The numbers don't lie. Sure with the proper tires anything can hook.
And it's "proper."

It's spelled "maybe."

You cannot compare your car to others.
A. You have a speed shop helping you.
B. You're on E85 which is not available to everyone or not everyone is available to use.
C. You have lightweight body parts and seats removed. You have to give the full story when you're telling it.

again, spewing misleading info Scot?

everyone should know the full story by now, but here goes,

all these cars are tuned, so the shop help doesn't count for what you think it does (anyone at this level has close ties to a shop though, so don't kind yourself)

take away the e-85 if you like, most forlks have access to it, but take it away (but don't forget your hero is on it as well) it only added less than 20 rwhp.

there are no lightweight body parts only tubular bumper supports (-25 lbs)

again, your hero has no pass side seat or back seat.

my car still weighs 3512 with driver, hardly a "lightweight" race car only setup.

full story..........

now we can get to your claims, where is your 11 sec time slip?
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Old 05-11-2013, 03:16 PM   #35
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Nowhere did Ozzy say he was interested in 4.10's or did you see something I didn't? And again you're comparing your car that has removed or lightweight body parts of which the majority of us are not willing to do. As far as E85 is concerned there are ZERO gas stations in the state of CT that carry it. So it is not available for everyone. Brett is not hero, not by a long shot. And then you tell Ozzy converters aren't for everyone and then post two videos with cars with unknown gears and converters. You don't make any sense. I'm looking out for Ozzy here, nothing more. If he chooses a different route so be it. Let's not make this thread about us. Remember, it's Ozzy that is looking for the help.
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