4.10 over 3.73 - Mustang Evolution

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Old 11-05-2013, 05:58 AM   #1
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4.10 over 3.73

I've been in this site for over a year

---------- Post added at 08:58 PM ---------- Previous post was at 08:55 PM ----------

[QUOTE="Polar Bear;1848203"]I've been in this site for over a year and have lots of posts about gears so I apologize for asking this. I purchased a set of 4.10 from AM last year and they have been sitting in a cabinet the whole time. Being in Japan makes it difficult to get help at modding a muscle car. I found some potential help but they quickly shunned 4.10 and say 3.73 is they max for a DD. As this car see very limited highway usage is that so?
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Old 11-05-2013, 06:36 AM   #2
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I've been in this site for over a year ---------- Post added at 08:58 PM ---------- Previous post was at 08:55 PM ----------
Stick with 4.10!!!! It'll be fine for city!
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Old 11-05-2013, 06:37 AM   #3
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Thank you
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Old 11-05-2013, 08:35 AM   #4
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Limited highway mileage means 4.10s would be better. Even on the highway with 4.10s you're only going to be turning around 2500 RPM at 70mph.
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Old 11-05-2013, 01:03 PM   #5
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Limited highway mileage means 4.10s would be better. Even on the highway with 4.10s you're only going to be turning around 2500 RPM at 70mph.

Mine turns 2,800 at 70mph. I think they are way too aggressive for a DD, I'm about to back off to 3.73s. I have 3.73s in my V6 and am about to back off there also to the 3.15s that originally came out of the GT (still better than the stock 2.73s). Probably just me but I have decided that the new and the thrill wore off real quick in both cases. I'm not a pro or a street racer so the taller gears and better gas mileage will work better for me. Good luck on your decision.
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Old 11-05-2013, 01:19 PM   #6
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Mine turns 2,800 at 70mph. I think they are way too aggressive for a DD, I'm about to back off to 3.73s. I have 3.73s in my V6 and am about to back off there also to the 3.15s that originally came out of the GT (still better than the stock 2.73s). Probably just me but I have decided that the new and the thrill wore off real quick in both cases. I'm not a pro or a street racer so the taller gears and better gas mileage will work better for me. Good luck on your decision.
The way the transmissions are designed 4.10s really aren't the best gear for the 11+ V6 or GT, but they are amazing for the older 5 speeds
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Old 11-05-2013, 01:32 PM   #7
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The way the transmissions are designed 4.10s really aren't the best gear for the 11+ V6 or GT, but they are amazing for the older 5 speeds
Exactly, I was basing the anticipated results on my classics. In both of my current cars I have begun to manually shift and start in 2nd in the V6 and even 3rd in the GT.
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Old 11-05-2013, 02:15 PM   #8
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Exactly, I was basing the anticipated results on my classics. In both of my current cars I have begun to manually shift and start in 2nd in the V6 and even 3rd in the GT.
Reminds me of when I autocross I leave it in 2nd. There was a guy with a 5.0 there and he said he was in 3rd because the lower gears were too torquey, he even thought about shifting to 4th lol... Autocrossing lol. Made me feel like my car has no power
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Old 11-05-2013, 02:37 PM   #9
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You won't have any problems driving daily with 4.10s. Check out the sticky about Gear RPM thread or click the link in my signature to go to it. I have a video taken of my dash at different speeds on the interstate showing the RPMs. If you cruise at 65 you turn like 2100. That's still fuel efficient. Most of my tanks yielded around 20-21 mpg mixed hwy/city driving with my 4.10s.
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Old 11-05-2013, 02:44 PM   #10
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Sixpac was able to get 23mpg going 80mph turning about 2300rpm with 3.73s.
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Old 11-05-2013, 04:54 PM   #11
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Sixpac was able to get 23mpg going 80mph turning about 2300rpm with 3.73s.
I just got 22-24 mpg mixed driving with my 4:10s
And I have a heavy foot
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Old 11-06-2013, 07:09 AM   #12
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4V is a little different but I remember getting 24mpg in my old 5.0 Cobra a few times hand calculated.
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Old 11-06-2013, 09:15 AM   #13
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So for a 03 GT it would be best to put 3.73? I do mixed between highway and city but mostly city driving
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Old 11-06-2013, 09:27 AM   #14
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So for a 03 GT it would be best to put 3.73? I do mixed between highway and city but mostly city driving
Its an auto also. If that makes a difference
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Old 11-06-2013, 10:01 AM   #15
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So for a 03 GT it would be best to put 3.73? I do mixed between highway and city but mostly city driving
4.10 all the way
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Old 11-06-2013, 10:46 AM   #16
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4.10s especially being auto. Do the J-mod as well.

J-mod

Here is a good reaction video from a guy who just did it. The look on his face as it nails 3rd says it all.
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Old 11-06-2013, 06:37 PM   #17
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4.10s especially being auto. Do the J-mod as well. J-mod Here is a good reaction video from a guy who just did it. The look on his face as it nails 3rd says it all.
Hahaha thats awesome thanks man

---------- Post added at 07:37 PM ---------- Previous post was at 07:35 PM ----------

Sorry for stupid question but what is jmod?
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Old 11-06-2013, 10:25 PM   #18
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Watch the video. Its basically a shift kit for $60 worth of gaskets and a few drill bits and is way more effective.
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Old 11-07-2013, 03:52 AM   #19
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Anyone by chance know what speedo I will need after installing the 4.10s. It's a 97 so it's not an easy tuner fix.
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Old 11-07-2013, 06:08 AM   #20
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Watch the video. Its basically a shift kit for $60 worth of gaskets and a few drill bits and is way more effective.
I did watch it his face is priceless and ok thanks
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Old 11-07-2013, 07:50 AM   #21
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No, the first link is the j mod how to. I included two.
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Old 11-07-2013, 10:13 AM   #22
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No, the first link is the j mod how to. I included two.
Oops sorry i only clicked one of them didnt realize they were two different links thanks
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Old 11-07-2013, 01:02 PM   #23
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Anyone by chance know what speedo I will need after installing the 4.10s. It's a 97 so it's not an easy tuner fix.
A 97 GT is still the 4.6l, you could easily change the speedo with a tune.
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Old 11-07-2013, 09:04 PM   #24
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A 97 GT is still the 4.6l, you could easily change the speedo with a tune.
Not to argue but I'm hearing otherwise. I will look into it some more.
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Old 11-07-2013, 09:08 PM   #25
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Not to argue but I'm hearing otherwise. I will look into it some more.
The 96-98GT had the NPI 4.6 2v, then in 99 it got the PI motor. The 94-96 had the 5.0
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Old 11-08-2013, 12:05 AM   #26
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The 96-98GT had the NPI 4.6 2v, then in 99 it got the PI motor. The 94-96 had the 5.0
The question isn't about the motor. It was about the speedo and re calibrating it after installing 4.10s.
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Old 11-08-2013, 12:30 AM   #27
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The question isn't about the motor. It was about the speedo and re calibrating it after installing 4.10s.
I know, but you said "it's a 97 so it's not an easy tuner fix". I assumed you meant tuner as in something like a handheld tuner. And since it's the 4.6 you can use the tuner to re calibrate the speedometer...

This is what I assumed you meant, my apologies if that isn't what you meant.
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Old 11-08-2013, 02:08 AM   #28
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Cannot use tuner to fix speedo. Only 99-04.
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Old 11-08-2013, 03:10 AM   #29
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Cannot use tuner to fix speedo. Only 99-04.
Which is what I thought so I asked if anyone knew what speedo I needed to use.
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Old 11-08-2013, 10:58 AM   #30
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Oops. Tried to copy a link. Lol.

---------- Post added at 11:58 AM ---------- Previous post was at 11:55 AM ----------

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Oops. Tried to copy a link. Lol.
You need a speedometer recalculation tool. About $144 on AM. Or a speedo gear. About $15
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Old 11-08-2013, 11:08 AM   #31
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Late model restoration has a calculator on their web page to help you figure out what speedo gear you need.

You will never get the exact right speed using the gears. Just a heads up.

Also do not use the white 23 tooth gear if it tells you you need that one. People have only had problems.
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Old 11-08-2013, 11:22 AM   #32
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Imma drop my car off to get my gears installed today!!

Im so excited!
And i just cant hide it!
Im about to lose control and i think i like it!

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Old 11-08-2013, 07:28 PM   #33
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Imma drop my car off to get my gears installed today!! Im so excited! And i just cant hide it! Im about to lose control and i think i like it!
Well?
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Old 11-08-2013, 07:30 PM   #34
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Well?
not ready yet :'-(
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Old 11-08-2013, 07:47 PM   #35
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not ready yet :'-(
Ahh that blows man... Where they busy or something?? Doesn't take long to swap gears
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