Difference in Speedo After Gear Install - Mustang Evolution

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Old 02-23-2015, 02:11 PM   #1
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Difference in Speedo After Gear Install

So my 3.73 gears are being delivered today. Of course I want to get them put in ASAP but Im still deciding if I want to wait for a drive shaft or not...

Anyway, when going from 2.73 to 3.73 gears how much is the speedo off by? I dont have a tuner and to be honest I dont plan on tuning it right now, so Ill have to live with my speedo being off a bit.
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Old 02-23-2015, 02:30 PM   #2
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what size tires are you running
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Old 02-23-2015, 02:31 PM   #3
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SoCal if you have the money for the driveshaft buy it but if if not then you can wait a little before buying it. A lot of people run new gears without a aluminum driveshaft.


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Old 02-23-2015, 02:33 PM   #4
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Well if your auto you need a tune to adjust your shift points

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Old 02-23-2015, 02:36 PM   #5
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Well, I would say, hold off on the driveshaft and get a tuner so you can fix the speedo and stuff. Unless you are doing over 110, then the stock shaft should hold you over for a bit.
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Old 02-23-2015, 02:45 PM   #6
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As far as the drive shaft goes, I have the money but yet I dont have it. I would have to use a CC to buy it and Im not sure I want to do that. The car will never see over 100, I just dont drive like that.

Im running 20's with a 6 speed manual.
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Old 02-23-2015, 02:50 PM   #7
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When I changed from 2.73 to 3.55 the speedo was off over 10 mph. Yours will be even more.


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Old 02-23-2015, 02:56 PM   #8
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When I changed from 2.73 to 3.55 the speedo was off over 10 mph. Yours will be even more.


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Damn that much huh?
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Old 02-23-2015, 02:56 PM   #9
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Will you be accelerating really hard or something? If not that or high speeds, I don't think an aluminum driveshaft is gonna give you what you will be spending on it? The MPG change and performance is almost non-existent. Since you have a manual, it would be $700 to get rid of the vibration issue that some of those have. But that is about it.

However, it is your car and you are the Staff here! So whatever choice you make, the rest of us can live with

I bought into the Driveshaft gimmick and wish I spent the $700 on some good headers and something else. lol
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Old 02-23-2015, 03:03 PM   #10
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Damn that much huh?

Yea. I used a gps for a while until my tuner could make the change.


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Old 02-23-2015, 03:03 PM   #11
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Will you be accelerating really hard or something? If not that or high speeds, I don't think an aluminum driveshaft is gonna give you what you will be spending on it? The MPG change and performance is almost non-existent. Since you have a manual, it would be $700 to get rid of the vibration issue that some of those have. But that is about it.

However, it is your car and you are the Staff here! So whatever choice you make, the rest of us can live with

I bought into the Driveshaft gimmick and wish I spent the $700 on some good headers and something else. lol
Lol, thanks Kevin and yes Im the staff here so dont make me mad...

To be honest I feel kind of the same way. Yes the DS has advantages, but will it be worth it for me? I guess I could always add it later like some one else said. I just thought since it will be in the shop getting the gears done they could do the DS too. My gut tells me to wait. Thanks for the advice guys!!
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Old 02-23-2015, 03:03 PM   #12
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Quote:
Originally Posted by Socal Stangman View Post
So my 3.73 gears are being delivered today. Of course I want to get them put in ASAP but Im still deciding if I want to wait for a drive shaft or not...

Anyway, when going from 2.73 to 3.73 gears how much is the speedo off by? I dont have a tuner and to be honest I dont plan on tuning it right now, so Ill have to live with my speedo being off a bit.
I just went from 2.73 to 3.73. The car was done about 30 minutes before the snowstorm in VA. I didn't want to risk getting stuck while tuning it at the shop so I drove home without tuning it for the updated gears.

My car is a 2014 v6 Automatic. If I remember correctly, the speedo said 70, but my actual speed was 45-50. I'm not sure how much, if at all, it differs on a manual. But hopefully that gives you a rough idea. Since you have a manual, you won't have to worry about the shift points.

-edit for your last post-

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Lol, thanks Kevin and yes Im the staff here so dont make me mad...

To be honest I feel kind of the same way. Yes the DS has advantages, but will it be worth it for me? I guess I could always add it later like some one else said. I just thought since it will be in the shop getting the gears done they could do the DS too. My gut tells me to wait. Thanks for the advice guys!!
I also really wanted the aluminum driveshaft. I wanted to get it installed at the same time as my gears. The shop convinced me that the advantages don't justify the money for my intentions. The first questions they asked me were "do you track the car?" "how often do you need to go over 110mph?" both answers being no/never, they told me not to waste my money and put it towards something else/save it.
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Old 02-23-2015, 03:04 PM   #13
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As far as the drive shaft goes, I have the money but yet I dont have it. I would have to use a CC to buy it and Im not sure I want to do that. The car will never see over 100, I just dont drive like that.

Im running 20's with a 6 speed manual.

Can't really give you an exact number unless you give what tire size you are running.
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Old 02-23-2015, 03:07 PM   #14
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Can't really give you an exact number unless you give what tire size you are running.

Lol sorry. 275/35/20 and 255/35/20
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Old 02-23-2015, 03:13 PM   #15
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I mean, if you REALLY want the DS then go for it. But the install is soo easy it is stupid. I did it myself. 8 bolts. Thats all that is holding it on. So if it had to wait, you wouldn't be missing out on a 1 time thing.



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Old 02-23-2015, 03:22 PM   #16
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I mean, if you REALLY want the DS then go for it. But the install is soo easy it is stupid. I did it myself. 8 bolts. Thats all that is holding it on. So if it had to wait, you wouldn't be missing out on a 1 time thing.



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Yeah I think Ill hold off.
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Old 02-23-2015, 03:23 PM   #17
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Socal, what kind of setup do you have so far? I don't see a garage published for you and no signature with mods.
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Old 02-23-2015, 03:35 PM   #18
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Quote:
Originally Posted by Socal Stangman View Post
So my 3.73 gears are being delivered today. Of course I want to get them put in ASAP but Im still deciding if I want to wait for a drive shaft or not...

Anyway, when going from 2.73 to 3.73 gears how much is the speedo off by? I dont have a tuner and to be honest I dont plan on tuning it right now, so Ill have to live with my speedo being off a bit.
That's a 37% increase in revolutions of your driveshaft and a 37% increase on your speedometer. That a lot more than a bit. You'll definitely show a big improvement on your 0-60.
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Old 02-23-2015, 03:37 PM   #19
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That's a 37% increase in revolutions of your driveshaft and a 37% increase on your speedometer. That a lot more than a bit. You'll definitely show a big improvement on your 0-60.

LOL! This may be related to another heated thread on here.
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Old 02-23-2015, 03:48 PM   #20
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LOL! This may be related to another heated thread on here.
I almost made reference to it.LOL
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Old 02-23-2015, 03:50 PM   #21
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This must be the breakthrough people are using to set records. Even better then adding a procharger or getting a 5.0. Who would've thought? Lol

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Old 02-23-2015, 04:01 PM   #22
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Lol sorry. 275/35/20 and 255/35/20
oops one more question are you running an auto to stick?
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Old 02-23-2015, 04:07 PM   #23
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I think he said he was running the 6 speed manual.
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Old 02-23-2015, 04:25 PM   #24
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just do the math in differance between 2.73 and 3.73 approx 30% is your answer.

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Old 02-23-2015, 06:23 PM   #25
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Thanks for all the great replies everyone.

Kevin, I don't have a list on the stuff I've done to my Mustang. I'll have to come up with a sig or something with my mods.
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Old 04-06-2015, 01:47 AM   #26
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So I'm kind of in the same boat as the OP. On Tuesday I get my car back with my 3.73 gears and I have a bama x4 tuner that I will use as soon as the shop hands me my keys. When I ordered my tuner they asked me the questions about the upgrades I have in my car and I selected 3.73 gears. My question is, when I install the performance tune (for break in period) will my speedo be calibrated or do I have to do something extra to get it right. I'm totally new to tuners btw. 2014 mustang v6 auto


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Old 04-06-2015, 02:38 AM   #27
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When you selected 3.73 in the tune request sheet, that told the tuner to build the tune for those gears, including the speedo calibration.

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Old 04-06-2015, 06:52 AM   #28
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I know this isn't required but I like this little calculation table so much, I wanted to share it.
Speedometer Correction Calculator
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Old 04-07-2015, 03:38 PM   #29
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It will be correct


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Old 04-07-2015, 03:56 PM   #30
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If you have a smart phone, get a speedometer app and just use that until you can get your tuner. It's free.
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Old 04-07-2015, 04:03 PM   #31
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It will be correct


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What do you mean?
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Old 04-07-2015, 04:29 PM   #32
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Stang man how's the gears??


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Old 04-07-2015, 04:38 PM   #33
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Stang man how's the gears??


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I'm supposed to get it back tomorrow. The shop was real busy so he had to keep it for a couple of days
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Old 04-07-2015, 04:41 PM   #34
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Lol....they did the same thing to me. He had for a day and a half lol....it seemed forever!!


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Old 04-07-2015, 04:55 PM   #35
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Lol....they did the same thing to me. He had for a day and a half lol....it seemed forever!!


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I know. I had to rent a car...its a crappy Nissan Versa. It has a whopping 107HP 4 banger...oh yeah.
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