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Old 11-16-2014, 09:53 PM   #1
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4:10s - Tune? Pros and cons?

Ordered me some 4:10s
Wasn't sure if needed to tune the car. It's bone stock.

Waiting for Lund to drop a new tuner before I take that plunge.


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Old 11-16-2014, 09:55 PM   #2
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Auto or manual?
Auto - waste
Manual - they are a waste with your car being stock

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Old 11-16-2014, 10:07 PM   #3
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4:10s - Tune? Pros and cons?

Auto

:-/

Why waste?
I'm not running tracks. Stop lite to stop lite. 10s in back soon with good tires.


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---------- Post added at 11:07 PM ---------- Previous post was at 11:06 PM ----------

I had 4:10s in a 88 GT manual and loved them.
Everyone I talk to says the rule of thumb is 4:10s auto and 3:73s manual.



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Old 11-16-2014, 10:13 PM   #4
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That was the rule of thumb for the older cars the.
The 5.0 automatic is a 6r80 and has a first gear of 4.17 in it.


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Old 11-16-2014, 10:15 PM   #5
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Yea the 3.73 for manual and 4.10 for auto does not go to all mustangs in general. It was only for the 04 and down, can be argued for the 05-10, but definitely not for the newer 11+.
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Old 11-16-2014, 10:16 PM   #6
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So ..... I screwed up?

I'm not a good numbers guy. If 4:10s go in, what will I feel different in the car? Worse take offs?

The few ppl that put me over the edge to buy them said Id never be able to keep rubber on the wheels

So of course I was like "fun!"


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Old 11-16-2014, 10:17 PM   #7
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I wonder if AM will let me switch.

What should I look at to give me that extra punch in the seat?


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Old 11-16-2014, 10:18 PM   #8
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^ first gear of 4.17 and a final drive of 4.10 speaks for itself.

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Old 11-16-2014, 10:19 PM   #9
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You will never plant the tires in 1st, it may be fun for red light to red light

I run 4.10's in my 2012 5.0 it's a manual

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---------- Post added at 10:19 PM ---------- Previous post was at 10:19 PM ----------

3.31's for you

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Old 11-16-2014, 10:20 PM   #10
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The car is going to have almost no 1st gear, and you are going to top out pretty quick. The 5.0 has plenty of power, no need for such extreme gears. Most go 3.31 or 3.15 (stock) for the autos.
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Old 11-16-2014, 10:22 PM   #11
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Not to mention. AM has nothing but 5 star reviews of 11-14 guys putting in 4:10s


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Old 11-16-2014, 10:22 PM   #12
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^ try it then

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Old 11-16-2014, 10:23 PM   #13
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Bummer...

Thanks guys. Glad I asked.
Guess I got some thinking to do.


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Old 11-16-2014, 10:27 PM   #14
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Still it'd need a tune with them correct?


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Old 11-16-2014, 10:28 PM   #15
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Quote:
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Not to mention. AM has nothing but 5 star reviews of 11-14 guys putting in 4:10s


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Most of them think the exact same thing as you thought. You do feel a difference in acceleration because gears are shorter and you go through them quicker. Realistically though its just how the car "feels", gears like 3.31 will still be "faster"
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Old 11-16-2014, 10:53 PM   #16
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4.10's is good with the magnum tranny.

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Old 11-16-2014, 10:59 PM   #17
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4.10's is good with the magnum tranny.

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Different gearing. Assume you are talking about the T-56 Magnum? That has 2 different choices for gearing available, the 2.97 and the 2.66, both completely different than the 6R80's 4.17.

A 4.17 1st gear with 3.31s is a total of 13.8 (4.17x3.31)
A 2.66 1st gear with 4.10s is a total of 10.9

So realistically 4.10s in the T-56 magnum that uses a 2.66 1st gear is going to be LESS aggressive than the 6R80 with 3.31s.
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Old 11-17-2014, 12:10 AM   #18
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As already mentioned 4.10's in the auto are way to much gear and a waste.

I've been 11.2 @ 122 mph still on my stock 3.15's. Those gears work just fine.


Regardless though a gear change requires a tune which should be the first thing you should do performance wise.
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Old 11-17-2014, 11:23 AM   #19
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Thanks grabber




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Old 11-17-2014, 12:32 PM   #20
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The fastest auto guy's have tried all the ratio's. You just got sold more parts for no real gain. 3.31's for auto I think were the fastest. Your factory 3.15's would have been fine. Money much better spent elsewhere...
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Old 11-18-2014, 09:58 PM   #21
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I have the ford racing 4.10's installed on my 2014, I don't race or any of that I personally like the low geared cars . True it shortens the shifting but I like it
I think it wakes the car up

Also if you do a year change you will need a tuner to adjust your speedo

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Old 11-18-2014, 10:11 PM   #22
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^ it will wake the car up if it's set up for the gears in a manual. If not then it will have the car slower.

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Old 11-18-2014, 10:14 PM   #23
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Not to mention. AM has nothing but 5 star reviews of 11-14 guys putting in 4:10s


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Trusting reviews from AM is like listening to the food babe for legit nutrition/health advice... Also the reviews on AM are just for the 4.10s and most people get the manual transmissions so MOST of them will be from manual trans guys where it does help to have the 4.10s. The manual has a 3.5x first gear and no converter to multiply the torque off the line like the auto does.

Basically we are all trying to save you a lot of money and having to find out the hard way that you paid money to get slower. But do what you want, not my ride.
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Old 11-18-2014, 10:26 PM   #24
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Yea mine is a manual
I can't speak for an auto
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Old 11-19-2014, 08:07 AM   #25
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Thanks guys.
Some of you can be blunt but I just take that as old timers knowing what they talking about. Been talking to Alex at AM and kudos to him, he will take them back and exchange.

Like I told Alex, I'm not a track guy. I'm just the local guy on the town cruise that like to show off.

I'm playing with guys in like 350zs and chargers.


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Old 11-19-2014, 08:24 AM   #26
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I like watching the guys with autos and 4.10's at the track when they shift into 2nd before the 60'.
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Old 11-19-2014, 09:06 AM   #27
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Or shift into 4th before the 1/4 pole...

OP, what did you exchange them for? You probalby don't need to get rid of the 3.15s honestly, that $$$ for the gears and the $$$ to have a shop install can go elsewhere and get you way better bang for the buck.
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Old 11-19-2014, 09:14 AM   #28
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Grabber

You think you would be willing to talk on phone?


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Old 11-19-2014, 09:15 AM   #29
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OP, what did you exchange them for? You probalby don't need to get rid of the 3.15s honestly, that $$$ for the gears and the $$$ to have a shop install can go elsewhere and get you way better bang for the buck.
This. Your money can be better spent somewhere else.
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Old 11-19-2014, 09:35 AM   #30
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Grabber

You think you would be willing to talk on phone?
Sure. PM sent.
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Old 11-19-2014, 12:04 PM   #31
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Still it'd need a tune with them correct?
Yes, you'll need to get a tuner OR the dealer (or any mechanic shop with the Ford IDS system) can program your car for stock ratios/options.

For modern 5.0's the general rule, IF you're going to get gears, you get:

3.31 for auto, maybe 3.55

3.73 for manual, maybe 4.10

Just going up one notch works well. Up 2 notches and your run out of room at the top end and you're shifting way too often... losing time.

As grabber is probably going to tell you.... spend your money on a Circle D torque converter.
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Old 11-19-2014, 12:10 PM   #32
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Honestly for the auto the guys leave the 3.15s or go 3.31s, 3.55s will have the trans shifting into 4th and out of the peak powerband before the 1/4 mile. For the stick, just go 4.10s or even 4.30s and call it a day. People get all scared off by the highway RPM with the steeper gears. If you're already at 3.73s, another 100-150 RPM on the highway isn't going to kill you. Go up half or 1 inch on rear tire size and it'll come right back down for cruising.
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Old 11-19-2014, 12:28 PM   #33
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4:10s - Tune? Pros and cons?

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Honestly for the auto the guys leave the 3.15s or go 3.31s, 3.55s will have the trans shifting into 4th and out of the peak powerband before the 1/4 mile. For the stick, just go 4.10s or even 4.30s and call it a day. People get all scared off by the highway RPM with the steeper gears. If you're already at 3.73s, another 100-150 RPM on the highway isn't going to kill you. Go up half or 1 inch on rear tire size and it'll come right back down for cruising.

4.10 and people would be shifting into 5th as they cross the line. With my 28.4" tall tires I will top at 116mph in 4th gear on 4.10 gears. With 3.73 I top at like 128mph in 4th.

I can't imagine needing to cross the 1/4 mile line needing to shift to 5th which for sure 4.30 would require me to and I have tall as hell tires. This coming from me shifting at 7600rpm.


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Old 11-19-2014, 01:01 PM   #34
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Eh, I dunno then, gotta look at the whole combo, some ppl have them tuned to shift even closer to 8k apparently.
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Old 11-19-2014, 04:48 PM   #35
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4:10s - Tune? Pros and cons?

As a general rule, look at what speed you will likely trap crossing the line. You want to cross with as little gearing as possible so long as you have the HP to pull in the taller gears.

So if your mods and tune should let you cross the line at about 117mph then the 4.10 gear with 4th gear maxing at 110-116mph will make you bang the limiter a split second right before crossing. Might lose 0.05-.3s or whatever.

But if you have 650whp you can go with taller gears and tires so tall that you may cross with a 125-130mph and you will need to gauge what gears net the best run. A 3.31 gear on 28.4" tires will net a third gear max of 115mph and a 4th gear max of 147mph. But a 3.73 ratio will net 4th max at just about 130mph. All of this shifting at 75-7600rpm.

In short there is no perfect gear. You must gauge what your intentions are. Highway rolls then 4.10 or 4.30 gears maybe so short that you will shifting into 5th and crest 6th gear depending on tire size before the run is near done. Whereas with 3.31 gears on highway rolls maybe too tall because your HP isn't enough to run through the gears fast enough.

I guess that's why with Coyotes most owners find the 3.73 the best gear because it's short enough to feel quicker than the 3.31 and the HP is high enough to do a decent highway pull with just enough gearing to get to speed without shifting into 5th like you would need to with a 4.10 or 4.30 by the time you hit 110-115mph in 4th. If you're shifting into 5th on the highway son you might wanna slow down. Lol

But this is for the MT82. The OP wants to know about gears for his auto set up. For automatics 3.31 is max you should go if you're a bolton car.


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