Go Back   The Mustang Source - Ford Mustang Forums > Mustang by Model Year > 2005-2009 Mustang
Sign in using an external account
Register Forgot Password?
Search

2005-2009 Mustang
S197 Discussion & News

Welcome to The Mustang Source!
Welcome to The Mustang Source,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 2/25/12, 11:27 PM   #1
Mach 1 Member
 
mrp5150's Avatar
 
Mark

Join Date: July 5, 2011
Location: La Jolla, CA
Posts: 890
2008 Bullitt
Garage
4.10 gears = lower top speed?

Hey guys, I'm sure this is probably a stupid question, but if I had a stock 05-09 GT and wanted to put in 4.10 gears, how much would that lower the top speed...if at all? I'm not really worried since I'm not going to be racing it or driving 140 mph on the highways, just curious. And how much would that increase the 0-60 time by? Also, would I need any other mods if I wanted to do that? I read somewhere that if you change the gears like that, the speedometer doesn't give the correct reading? Thanks in advance!
mrp5150 is online now   Reply With Quote
Old 2/26/12, 6:21 AM   #2
I Have No Life
 
Glenn's Avatar
 
Glenn

Join Date: August 7, 2006
Location: Lockport il
Posts: 12,110
06 LL GT
I don't know how much top end you would lose but you would lose some. You will need a tuner to correct the speedo after a change of gears
__________________
Hers 2010 lexus IS250 mine 06 legend lime GT, Shaftmasters alum drive shaft, under drive pulley's, Steeda sport springs, Koni strt S/S, JLT cai w/bama tunes, Hankook V12's 255/35 275/35/20" pinnacale wheels, BBK headers W/high flow BBK catted X-pipe, Pype's Violator Axle-Back. 3k oil change tires
Glenn is offline   Reply With Quote
Old 2/26/12, 9:25 AM   #3
Mach 1 Member
 
Kevin509's Avatar
 
Kevin

Join Date: October 30, 2011
Location: Spokane, WA
Posts: 845
'06 Satin Silver GT
You'd have to do some math with the gear ratios and tire size and what not, but potentially you could lose some top speed. However, you'd get to that top speed quicker. aggressive gears like that are going to affect your cruising rpms. If you do a lot of freeway daily driving that's something to keep in mind because your fuel economy is going to be affected.

Edit: I did the math, assuming your car is a 5 speed manual, with 4.10 gears 5th revs out at over 180 mph. So, you won't loose any top speed. Your car will loose it's battle with the air resistance long before it reached that point.
__________________
2006 Satin Silver GT: 3.73's - Magnaflow Axle Backs - Pypes O/RX - Spectre/K&N CAI - Bama 91 performance tune

"...the engine pulsing against backpressure like Zeus casually farting in his Olympian hot tub." -Car and Driver Magazine on the Boss 302 exhaust :D

Last edited by Kevin509; 2/26/12 at 9:32 AM.
Kevin509 is offline   Reply With Quote
Old 2/26/12, 11:57 AM   #4
Mach 1 Member
 
mrp5150's Avatar
 
Mark

Join Date: July 5, 2011
Location: La Jolla, CA
Posts: 890
2008 Bullitt
Garage
I do pretty even amounts of city and highway driving. I was looking at the FRPP 4.10 gears on American Muscle and most of the reviews said the gas mileage didn't change much at all, and some even said it improved by a couple MPG?

And just to give me a rough idea, how much would it cost for the gears to be installed and the speedometer to be tuned by a shop?
mrp5150 is online now   Reply With Quote
Old 2/26/12, 12:21 PM   #5
Mach 1 Member
 
Kevin509's Avatar
 
Kevin

Join Date: October 30, 2011
Location: Spokane, WA
Posts: 845
'06 Satin Silver GT
Quote:
Originally Posted by mrp5150 View Post
I do pretty even amounts of city and highway driving. I was looking at the FRPP 4.10 gears on American Muscle and most of the reviews said the gas mileage didn't change much at all, and some even said it improved by a couple MPG?

And just to give me a rough idea, how much would it cost for the gears to be installed and the speedometer to be tuned by a shop?
Well, based on my math, stock, at 65 MPH the engine turns approx. 1900 RPM in 5th gear. With 4.10s, the engine turns approx 2200 RPM in 5th at 65. Not a huge difference, I admit, and we didn't buy mustang GT's for the gas mileage anyway
__________________
2006 Satin Silver GT: 3.73's - Magnaflow Axle Backs - Pypes O/RX - Spectre/K&N CAI - Bama 91 performance tune

"...the engine pulsing against backpressure like Zeus casually farting in his Olympian hot tub." -Car and Driver Magazine on the Boss 302 exhaust :D
Kevin509 is offline   Reply With Quote
Old 2/27/12, 12:32 PM   #6
V6 Member
 
Franchi's Avatar
 
Brian

Join Date: June 16, 2010
Location: Columbus OH
Posts: 97
2006 Mustang GT
It won't improve your mpg's at all that's for sure. It will knock it down, but not by a ton IF you keep your foot out of it. I saw only about average of 1 mpg less when I did 4:10's when I measured the gas MPG. But considering I normally get about 11 mpg now, I didn't care much. lol

The car will wind up MUCH quicker then before, esp first three gears.
__________________
2006 Mustang GT, 4:10 gears, Underdrive pulleys, O/R H pipe, Bassani exhaust, Xcal 3, C @ L Racer intake, Eibach suspension, Pro 5.0 shifter, Delete plates, Comp Cam Mutha Thumpr series 2 camshafts
Franchi is offline   Reply With Quote
Old 2/28/12, 6:40 AM   #7
Bullitt Member
 
Wades GT's Avatar
 

Join Date: April 25, 2010
Posts: 237
Images: 8
Quote:
Originally Posted by Franchi View Post
It won't improve your mpg's at all that's for sure. It will knock it down, but not by a ton IF you keep your foot out of it. I saw only about average of 1 mpg less when I did 4:10's when I measured the gas MPG. But considering I normally get about 11 mpg now, I didn't care much. lol

The car will wind up MUCH quicker then before, esp first three gears.
I thought I was bad with my 13-15mpg
Wades GT is offline   Reply With Quote
Old 2/28/12, 10:18 PM   #8
Mach 1 Member
 
mrp5150's Avatar
 
Mark

Join Date: July 5, 2011
Location: La Jolla, CA
Posts: 890
2008 Bullitt
Garage
Quote:
Originally Posted by Franchi View Post
It won't improve your mpg's at all that's for sure. It will knock it down, but not by a ton IF you keep your foot out of it. I saw only about average of 1 mpg less when I did 4:10's when I measured the gas MPG. But considering I normally get about 11 mpg now, I didn't care much. lol

The car will wind up MUCH quicker then before, esp first three gears.
11 mpg? That's insane, haha. So I'm guessing if the car is just totally stock other than the 4.10 gears, it would average around 18-20 mpg?
mrp5150 is online now   Reply With Quote
Old 2/29/12, 12:13 PM   #9
Mach 1 Member
 
Shotokan1509's Avatar
 

Join Date: June 22, 2006
Location: CT
Posts: 996
06 Vista GT
Quote:
Originally Posted by mrp5150 View Post
11 mpg? That's insane, haha. So I'm guessing if the car is just totally stock other than the 4.10 gears, it would average around 18-20 mpg?

That's about what I get, mixed driving, manual trans, 4.10's, heavy 20" wheels & bigger Brembo brakes, CAI, offroad Xpipe and a 93 tune (300rwhp/311rwtq).

The rpm with the exhaust, does get a little annoying at higher cruising speeds on highway for longer than say an hour.
__________________

Shotokan1509 is offline   Reply With Quote
Old 3/1/12, 9:17 PM   #10
Member
 
Heavy Metal Thunder's Avatar
 

Join Date: February 8, 2011
Posts: 27
It will NOT affect your top speed. Our cars come with a speed limiter of 145 mph. So unless you disable the speed limiter with a tune that turns it off your top speed is 145 no matter what gear ratio. Now if you turn off the speed limiter in your tune, your top speed will be whatever speed you are going when you redline in 5th gear. HOWEVER, our cars don't make enough power to redline in 5th gear so it's a moot point. You'll never hit top speed anyways, even on a 1/4 mile dragstrip your nowhere near hitting top speed.
__________________
JLT CAI / Bama 93 / 4.10ís / CMDPís / UDPís / FRPP Hot Rod Cams / MAC LTís / Prothane Mounts / Prochamber / Magnaflow HF Cats
MAC Axle Back / Eibach Prokit / Tokico Struts / BMR Adj. PHB / BMR LCA's / CHE K-Member w/ Tq. Limiters / Some Exterior Stuff
Heavy Metal Thunder is offline   Reply With Quote
Old 3/1/12, 10:19 PM   #11
Mach 1 Member
 
mrp5150's Avatar
 
Mark

Join Date: July 5, 2011
Location: La Jolla, CA
Posts: 890
2008 Bullitt
Garage
Gotcha. Thanks guys!
mrp5150 is online now   Reply With Quote
Old 3/3/12, 10:35 AM   #12
Mach 1 Member
 
Bert's Avatar
 
John

Join Date: January 25, 2010
Location: Massachusetts
Posts: 840
2010 Red Candy GT
Quote:
Originally Posted by Heavy Metal Thunder View Post
It will NOT affect your top speed. . . . if you turn off the speed limiter in your tune, your top speed will be whatever speed you are going when you redline in 5th gear. HOWEVER, our cars don't make enough power to redline in 5th gear so it's a moot point. .
Exactly!

Think of it this way -- the only way that changing the rear end ratio would affect your top speed is if you are hitting redline in 5th right now. Are you doing that?

(hint: probably not . . . 6000 RPM in 5th with the 3.31 rear would be over 200 MPH)

Assuming you have the standard 18" wheels/tires which are about 27.25" overall diameter, 6000 RPM in fifth with 4.10 rear ratio is 175 MPH

On the highway, the 4.10 rear WILL reduce gas mileage for sure. RPM is directly proportional to rear end ratio (at the same speed) and fuel consumption is roughly proportional to RPM . . . so when you go from 3.31 to 4.10 rear you are increasing RPM by 4.10/3.31 = 24.9% (in the same gear at the same speed) so you are also going to increase fuel consumption by about 25%. (a little less in the real world due to other things like wind resistance) Around town the affect is smaller because you are going up and down through the gears so you are not just cruising along at 25% higher RPM.
__________________
2010 GT Coupe
options: Red Candy, 5MT, Premium Pkg, 3.31 rear (a little slow but great MPG), Comfort pkg
mods: Roush CAI, FRPP KR/FR500S, Bama 87S tune for the winter, 35% tint, Steeda UDP's, Shaftmasters Alum d/s . . . lots more still on the wish list

Last edited by Bert; 3/3/12 at 10:40 AM. Reason: more
Bert is offline   Reply With Quote
Old 3/21/12, 9:04 PM   #13
Mach 1 Member
 
nonsensez9's Avatar
 
Calvin

Join Date: July 8, 2005
Location: Northern BC, Canada
Posts: 525
Quote:
Originally Posted by Franchi View Post
The car will wind up MUCH quicker then before, esp first three gears.
I did the 4.10's some time ago. First gear is pretty useless around town. I think the '05 was a 3.73 stock, so gas mileage down a tad, nothing serious.
nonsensez9 is offline   Reply With Quote
Old 3/21/12, 9:09 PM   #14
Swamp Donkey Man Cans
 
07S197's Avatar
 
Jim

Join Date: August 20, 2007
Location: Massachusetts
Posts: 4,055
2007 GT
Garage
Quote:
Originally Posted by nonsensez9 View Post
I did the 4.10's some time ago. First gear is pretty useless around town. I think the '05 was a 3.73 stock, so gas mileage down a tad, nothing serious.
05-09 GT 5MT
05 & 06 stock rear gears were 3.55's
07 and up standard was 3.31's with an option for 3.55's
__________________
"I know that you believe you understand what you think I said, but I'm not sure you realize that what you heard is not what I meant."

The Main Ride: 2007 GT Premium Coupe in Alloy Gray Metallic, 5/MT, IUP, Shaker 1000, GT app pkg, Security pkg.
Mods: SLP Loudmouths, MGW shifter, Sequential turn signals, Bama 93R tune, C&L CAI, V6 spoiler, 19" GT500 rims, FRPP 4.10 grears, FRPP "P" springs, GT500 strut mounts, Bullitt grill & STB, CDC chin spoiler.
Other Rides: 2013 Passat TDI SE & 2003 Honda GL1500 Valkyrie
07S197 is offline   Reply With Quote
Old 3/21/12, 9:23 PM   #15
Bullitt Member
 
Wades GT's Avatar
 

Join Date: April 25, 2010
Posts: 237
Images: 8
Quote:
Originally Posted by nonsensez9 View Post
I did the 4.10's some time ago. First gear is pretty useless around town. I think the '05 was a 3.73 stock, so gas mileage down a tad, nothing serious.
No....... Thats the annoy all your neighbors gear
Wades GT is offline   Reply With Quote
Old 3/21/12, 9:25 PM   #16
Swamp Donkey Man Cans
 
07S197's Avatar
 
Jim

Join Date: August 20, 2007
Location: Massachusetts
Posts: 4,055
2007 GT
Garage
I love the 4.10's in my car. I still average around 19 mpg on the highway and the response from the car is great.
__________________
"I know that you believe you understand what you think I said, but I'm not sure you realize that what you heard is not what I meant."

The Main Ride: 2007 GT Premium Coupe in Alloy Gray Metallic, 5/MT, IUP, Shaker 1000, GT app pkg, Security pkg.
Mods: SLP Loudmouths, MGW shifter, Sequential turn signals, Bama 93R tune, C&L CAI, V6 spoiler, 19" GT500 rims, FRPP 4.10 grears, FRPP "P" springs, GT500 strut mounts, Bullitt grill & STB, CDC chin spoiler.
Other Rides: 2013 Passat TDI SE & 2003 Honda GL1500 Valkyrie
07S197 is offline   Reply With Quote
Old 3/21/12, 9:39 PM   #17
Mach 1 Member
 
nonsensez9's Avatar
 
Calvin

Join Date: July 8, 2005
Location: Northern BC, Canada
Posts: 525
Quote:
Originally Posted by nonsensez9 View Post
I did the 4.10's some time ago. First gear is pretty useless around town. I think the '05 was a 3.73 stock, so gas mileage down a tad, nothing serious.
but back to the original question.... I don't think top end was reduced. It might even have increased a bit. Hard to tell as the speedo isn't all that accurate over 100 anyways, and with a re-calibration, who knows.... However, I would suspect that the best top end would be with a gear that allows you to just barely reach red-line in 5th gear. Maybe a 4.3, or even lower. As an example, many corvettes reach top speed in 5th gear rather than 6th.
nonsensez9 is offline   Reply With Quote
Old 3/21/12, 9:39 PM
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


 

Sponsors



 

MotM Winners
December 2012 MotM Winner November 2012 MotM Winner September 2012 MotM Winner August 2012 MotM Winner

All times are GMT -6. The time now is 9:08 AM.


Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.