2:73 to 3:31 Gear Swap Speedometer Recalibration Process - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > 2011-2014 V6 Mustang



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 04-06-2017, 09:33 PM   #1
Registered User
Newbie
 
Greg14SGM's Avatar
 
Join Date: May 2014
Location: Derby
Region: Kansas
Posts: 17
2:73 to 3:31 Gear Swap Speedometer Recalibration Process

So I've been doing research and read that going from a 2:73 to 3:31 gear needs a speedometer recalibration that a Ford dealer can do because it was a factory option. I asked my dealer and they seemed very unsure about it. I know it is possible, but my question is if anyone knows the actual process the dealer would take. All I've read is that they flash the ECU and it has something to do with Ford IDS. My assumption would be that they load a tune from a VIN that came with the 3:31 option, but you know what they say about assuming. Any help would be greatly appreciated, thanks!

Edit: it is a 2013 model if it matters.
Greg14SGM is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-06-2017, 11:07 PM   #2
Registered Member
Regular
 
iguanaman3's Avatar
 
Join Date: Jun 2014
Location: Bokeelia
Region: Florida
Posts: 333
Quote:
Originally Posted by Greg14SGM View Post
So I've been doing research and read that going from a 2:73 to 3:31 gear needs a speedometer recalibration that a Ford dealer can do because it was a factory option. I asked my dealer and they seemed very unsure about it. I know it is possible, but my question is if anyone knows the actual process the dealer would take. All I've read is that they flash the ECU and it has something to do with Ford IDS. My assumption would be that they load a tune from a VIN that came with the 3:31 option, but you know what they say about assuming. Any help would be greatly appreciated, thanks!

Edit: it is a 2013 model if it matters.
Most of us have a tune which specifies the axle ratio and given what a dealer will probably charge you, I would recommend getting a tuner instead and flashing your own ECU.. If you went to the trouble (and expense) of changing your gears why not get the most out of it? Tunes make a world of difference in our cars and are pretty darn safe too.
iguanaman3 is offline   Reply With Quote
Old 04-07-2017, 04:27 AM   #3
Staff

Regular
Staff
 
Strange Mud's Avatar
 
Join Date: Aug 2013
Location: Small Town
Region: Connecticut
Posts: 5,101
or find another dealer...great upgrade btw.
__________________
2012 V6 traded for a 2017 VW GTI
Strange Mud is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-07-2017, 04:42 AM   #4
Registered Member
Regular
 
3.7Cyclone's Avatar
 
Join Date: Dec 2013
Location: Mansfield
Region: Massachusetts
Posts: 198
Is this an auto?
__________________
16 Mustang Ecoboost Prem Fast Back | 2.3L | 3.55 gears | 201A Package | 20" Foundry Wheels P265/35R20 Continental DWS tires | Interior Trim package | Shaker Audio with SYNC 3 | Redline Elite Hood Struts | Mishimoto catch can | Mishimoto Intercooler(Black) | TS Vee port supersonic BOV | Tune+ tuning | Driveshaft Shop aluminum DS | Map big turbo kit | AEM Meth injection w/Mishimoto charge pipe and bung | http://www.youtube.com/user/eclypse3d
3.7Cyclone is offline   Reply With Quote
Old 04-07-2017, 05:36 AM   #5
Registered Member
Regular
 
David Young's Avatar
 
Join Date: Feb 2013
Location: Clinton
Region: Tennessee
Posts: 1,068
If you have a good relationship with your Ford dealer it will cost you $50 to flash your Mustang's computer. If you don't have a good relationship with your Ford dealer, it will cost you $100
__________________
Little Red. 2011 V6. Automatic Trans., C&L CAI, JLT Catch Can, BBK Ceramic Coated Long Tube Headers with BBK Catted X Pipe, Axle Exchange (American Muscle) Aluminum DriveShaft, GT 500 Lower Control Arms, Koni (orange) Dampers, Steeda Watts Link, Ford Racing 3.73 Gears, Magnaflow Street Series Axle Backs and a few more mods....Wifes car, 2014 Ford Edge Limited.
David Young is offline   Reply With Quote
Old 04-07-2017, 06:12 AM   #6
Registered Member
Regular
 
Voltwings's Avatar
 
Join Date: May 2014
Location: Houston
Region: Texas
Posts: 3,654
Quote:
Originally Posted by David Young View Post
If you have a good relationship with your Ford dealer it will cost you $50 to flash your Mustang's computer. If you don't have a good relationship with your Ford dealer, it will cost you $100
^^ I got a quote for $115 and decided going with the 3.31 factory option just wasnt worth it for the price, so we went 3.55 with an aftermarket tune.
Voltwings is offline   Reply With Quote
Old 04-07-2017, 09:05 AM   #7
Registered User
Newbie
 
Greg14SGM's Avatar
 
Join Date: May 2014
Location: Derby
Region: Kansas
Posts: 17
Quote:
Originally Posted by iguanaman3 View Post
Quote:
Originally Posted by Greg14SGM View Post
So I've been doing research and read that going from a 2:73 to 3:31 gear needs a speedometer recalibration that a Ford dealer can do because it was a factory option. I asked my dealer and they seemed very unsure about it. I know it is possible, but my question is if anyone knows the actual process the dealer would take. All I've read is that they flash the ECU and it has something to do with Ford IDS. My assumption would be that they load a tune from a VIN that came with the 3:31 option, but you know what they say about assuming. Any help would be greatly appreciated, thanks!

Edit: it is a 2013 model if it matters.
Most of us have a tune which specifies the axle ratio and given what a dealer will probably charge you, I would recommend getting a tuner instead and flashing your own ECU.. If you went to the trouble (and expense) of changing your gears why not get the most out of it? Tunes make a world of difference in our cars and are pretty darn safe too.
I've looked at it but the total cost of doing gears parts and labor is going to run me only $480. So getting a tuner and a tune would seem to add $400 which nearly doubles it. That and I wanted to avoid a tune, I think it bothers me that the car could never run a stock tune again if I went that route.
Greg14SGM is offline   Reply With Quote
Old 04-07-2017, 09:06 AM   #8
Registered User
Newbie
 
Greg14SGM's Avatar
 
Join Date: May 2014
Location: Derby
Region: Kansas
Posts: 17
Quote:
Originally Posted by 3.7Cyclone View Post
Is this an auto?
It is a manual.
Greg14SGM is offline   Reply With Quote
Old 04-07-2017, 09:35 AM   #9
Registered Member
Regular
 
Voltwings's Avatar
 
Join Date: May 2014
Location: Houston
Region: Texas
Posts: 3,654
Quote:
Originally Posted by Greg14SGM View Post
I've looked at it but the total cost of doing gears parts and labor is going to run me only $480. So getting a tuner and a tune would seem to add $400 which nearly doubles it. That and I wanted to avoid a tune, I think it bothers me that the car could never run a stock tune again if I went that route.
That seems too low... The gears themselves are $200-300 depending on where you buy, install kit with new bearings and shims is ~$75, and you'll need 3 qts of fluid at ~$25 a pop (if you buy the good stuff) and a bottle of friction modifier from Ford. That leaves you like $50 for labor...
Voltwings is offline   Reply With Quote
Old 04-07-2017, 09:40 AM   #10
Registered User
Newbie
 
Greg14SGM's Avatar
 
Join Date: May 2014
Location: Derby
Region: Kansas
Posts: 17
Quote:
Originally Posted by Voltwings View Post
That seems too low... The gears themselves are $200-300 depending on where you buy, install kit with new bearings and shims is ~$75, and you'll need 3 qts of fluid at ~$25 a pop (if you buy the good stuff) and a bottle of friction modifier from Ford. That leaves you like $50 for labor...

Gears are I think $160 on American Muscle, kit with shims is $95 and fluid $15 a piece. Labor is going to be $200.
Greg14SGM is offline   Reply With Quote
Old 04-07-2017, 10:04 AM   #11
Registered Member
Regular
 
Voltwings's Avatar
 
Join Date: May 2014
Location: Houston
Region: Texas
Posts: 3,654
Quote:
Originally Posted by Greg14SGM View Post
Gears are I think $160 on American Muscle, kit with shims is $95 and fluid $15 a piece. Labor is going to be $200.
Yes, Sorry, i was looking at gears that werent Ford Racing brand that were more expensive.
Voltwings is offline   Reply With Quote
Old 04-07-2017, 10:05 AM   #12
Staff

Regular
Staff
 
Strange Mud's Avatar
 
Join Date: Aug 2013
Location: Small Town
Region: Connecticut
Posts: 5,101
just a warning....make sure the installer knows how to do it AND will stand by his work. Gears are fussy and the can make noise if not properly done. Not that you asked but I would consider 3.55 or 3.73. I have the 3.31 and don't do much hwy...for my driving it would be to make 3rd gear more useable on two lane black top.
__________________
2012 V6 traded for a 2017 VW GTI
Strange Mud is offline   Reply With Quote
Old 04-07-2017, 11:38 AM   #13
Registered User
Newbie
 
Greg14SGM's Avatar
 
Join Date: May 2014
Location: Derby
Region: Kansas
Posts: 17
Quote:
Originally Posted by Strange Mud View Post
just a warning....make sure the installer knows how to do it AND will stand by his work. Gears are fussy and the can make noise if not properly done. Not that you asked but I would consider 3.55 or 3.73. I have the 3.31 and don't do much hwy...for my driving it would be to make 3rd gear more useable on two lane black top.
Definitely! My dad was a mechanic back in his day, so he's already warned me on that. Its a local guy that does it independently. He's somewhat of a specialist on the 8.8 rear end, done tons of them from practically every year they've been in the stangs.

So a question for those who say go with the tune. Who did you tune with/recommend? I'm really only familiar with AM/Bama because of its popularity. My main concern is making the car even slightly less reliable in anyway, because I want to have it for a LONG time. I've heard good and bad about it, but I am still considering it considering my first gear choice is 3.55.
Greg14SGM is offline   Reply With Quote
Old 04-07-2017, 12:33 PM   #14
Staff

Regular
Staff
 
Strange Mud's Avatar
 
Join Date: Aug 2013
Location: Small Town
Region: Connecticut
Posts: 5,101
I don't need no stinking tune.....mine came with the 3.31.
__________________
2012 V6 traded for a 2017 VW GTI
Strange Mud is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > 2011-2014 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ford Racing Speedometer Recalibration Tool Miri Pre-2005 V6 Mustang 0 08-15-2014 10:28 AM
2013 Speedometer Recalibration After Gear Change Old Sailor 2011-2014 Mustang GT 4 08-01-2013 04:41 AM
Motor Swap process 02StangGT 1996-2004 Mustang GT 57 03-25-2013 12:30 PM
speedometer recalibration shsfresh87 1996-2004 Mustang GT 2 02-07-2013 11:11 PM
98 Speedometer Recalibration Gears? Mustang414 Pre-2005 V6 Mustang 12 06-27-2004 07:48 PM

» Like Us On Facebook



02:50 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.