Gears and RPM's...

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HogStang

New Member

Mar 25, 2004

193

0

0

Apr 4, 2004

#1

• Apr 4, 2004

• #1

Well.. I'm getting 3.90's on my AOD 03 GT after hearing people say that the stock is obviously not enough and any where from the 3.73's to the 4.10's are good.. but my question is.. I've heard someone on this forum say they can only top out their Auto (forgot what year, not 03) at 110 MPH due to the RPM's going so high in 4th gear (on 4.10's may I add)... well what should I be able to top out at? Will I be able to go over 110MPH hopefully with the 3.90's? I know it's not as much as the 4.10's, but it's a little more then the 3.73's.. any input would be great.. thanks guys.

 

01GTConv

New Member

Jan 16, 2004

25

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0

Highlands Ranch, CO

Apr 4, 2004

#2

• Apr 4, 2004

• #2

Playing with the rpm calculator it looks to me like if a 4.1 maxed you out at 110mph (assuming that is true), then 3.9 would max you out at about 116mph. That would get you pretty close rpm wise. I am not exactly sure how you know what the max speed is though. I am assuming your rev limiter would stop ya. Good question.

http://www.allfordmustangs.com/Detailed/608.shtml

 

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HogStang

New Member

Mar 25, 2004

193

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0

Apr 4, 2004

#3

• Apr 4, 2004

• #3

Ok, well I don't know how well this works.. but doesn't OD count as sort of another gear? Let's say I'm in OD.. and I'm in 4th.. well would the car then drop into OD as a gear? I remember one time I floored my V6 (laf) anyways.. I got it up to 120 and it dropped into another gear when the RPM's peaked.. could this have been my OD and would this also be true in the V8? I would have to say yes seeing as my V6 was also an AOD as well.. but I'm not sure.. I'd still love to go over 120-130 MPH with my GT and I'm hoping I can with these new 3.90's.

 

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TARZAN

New Member

Apr 25, 2003

446

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0

Philly MS

Apr 5, 2004

#4

• Apr 5, 2004

• #4

WEll, I have 4.30's in my 00 Auto, and I can go well past the 110 you thought you read about.....

-Will

 

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HogStang

New Member

Mar 25, 2004

193

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0

Apr 5, 2004

#5

• Apr 5, 2004

• #5

Holy sh**... well then I'm not at all worried. LOL

 

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RacerGT

Founding Member

Jun 28, 2002

2,371

0

0

St. Charles, Missouri

Apr 5, 2004

#6

• Apr 5, 2004

• #6

I have 4.10s and my top speed in 3rd is 117mph. I have had my car up to 145mph in 4th with 1000rpms to go, so top speed should not be an issue.

BTW, going that fast is stupid... i know.

 

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HogStang

New Member

Mar 25, 2004

193

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0

Apr 5, 2004

#7

• Apr 5, 2004

• #7

LOL, no it's not.. it's awesome. And thanks for the input.. I was worried for a sec. Heh.

 

O

ONZZ

New Member

Feb 22, 2004

238

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0

Hawaii

Apr 5, 2004

#8

• Apr 5, 2004

• #8

RacerGT-thanks for the info. your car is a PIMP but you sites mod list isn't working. Nice 1/4 mile times

 

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cronin49

Banned

Aug 12, 2003

432

1

16

SC

Apr 5, 2004

#9

• Apr 5, 2004

• #9

rpm

RacerGT said:

I have 4.10s and my top speed in 3rd is 117mph. I have had my car up to 145mph in 4th with 1000rpms to go, so top speed should not be an issue.

BTW, going that fast is stupid... i know.

Click to expand...

Thats BS! With 410's your top speed in 3rd is about 85 mph. 4th tops out at around 112 mph. 145 indeed! try getting your speedo recalibrated, numbnuts! its idiots like you who need to shutup and stop putting out false information.

 

StngStr

Member

Jun 24, 2003

616

0

17

Central Florida

Apr 5, 2004

#10

• Apr 5, 2004

• #10

I hit 150 mph (5000 rpms in 5th) yesterday. Of course, I have 4.10's, not 3.90's and a 5 speed, not an auto. I don't think I'll be doing that again anytime soon. It was still slowly climbing and i'm sure with enough road I could have gone 160, but the road was coming up to an end, and my 20k mile old tires were vibrating.

 

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RacerGT

Founding Member

Jun 28, 2002

2,371

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0

St. Charles, Missouri

Apr 5, 2004

#11

• Apr 5, 2004

• #11

cronin49 said:

Thats BS! With 410's your top speed in 3rd is about 85 mph. 4th tops out at around 112 mph. 145 indeed! try getting your speedo recalibrated, numbnuts! its idiots like you who need to shutup and stop putting out false information.

Click to expand...

You're a damn moron. Notice I have an AUTOMATIC. Please do some research before you post something so damn stupid. God, what a tool.

You're just jealous that your sh** is slow. Bring on the 5spd, i'll put buslengths on ya.

 

StngStr

Member

Jun 24, 2003

616

0

17

Central Florida

Apr 5, 2004

#12

• Apr 5, 2004

• #12

RacerGT said:

You're a damn moron. Notice I have an AUTOMATIC. Please do some research before you post something so damn stupid. God, what a tool.

You're just jealous that your sh** is slow. Bring on the 5spd, i'll put buslengths on ya.

Click to expand...

 

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shane93nc

Member

Apr 18, 2003

208

0

16

charlotte,nc

Apr 5, 2004

#13

• Apr 5, 2004

• #13

RacerGT said:

You're a damn moron. Notice I have an AUTOMATIC. Please do some research before you post something so damn stupid. God, what a tool.

You're just jealous that your sh** is slow. Bring on the 5spd, i'll put buslengths on ya.

Click to expand...

ya that was kinda mean for him to say about you.

 

Dark Knight GT

I can't get it up......ok that didn't sound right.

May 26, 2003

3,653

2

56

Ozark, Missouri

Apr 5, 2004

#14

• Apr 5, 2004

• #14

Guys, I did some research. With a 4r70w automatic, you can tap out 3rd gear at approx. 110mph@6,200 rpms. Thus, I think 4.30 gears is a perfect gear for n/a automatic without internal motor work. If you have a higher rev-limiter than 6200rpms, then go with 4.56's.

 

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lilcgt

New Member

Nov 3, 2003

5

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0

Apr 5, 2004

#15

• Apr 5, 2004

• #15

I Have 4:10 in 03 5spd i had mine at 160 coming back from bike week and had more to go so Go with 4:10 youll love it