I'm looking to change the gears in my V6. I have a 2001 Manual 5 speed V6 Mustang and I want to know the difference between the two gears 4.10 and 3.73. and is there any other mod I should have done with changing gear ratios? I would just like the fastest take off I can get.Thanks.

 

4.10 would be great on the street but would suck on the highway
u would get horrible gas mileage, but if you dont car 4.10 is the fastest get up and go.

 

I can't say anything about the v-6, but 4.10's on the GT are great. I have no regrets and the fuel economy is about the same as with the 3.27's.

Gears do not suck up gas, load does. So, just because you are turning more rpms, does not mean you are using more fuel.

Also, when I had stock gears, I would always have to downshift to 4th on the highway a lot. No so with the 4.10's. But, the 4.10's are soo much quicker, you always want to nail it. They really make the car more fun to drive....and that I am sure might cost you at the pump.

 

you contradicted yourself,
here you are saying that gears dont suck up gas but here......

here you said they are....Truth is higher rpms mean more fuel dumped from injectors, means more fuel consumed, means runs out quicker. If rpms dont burn gas then why dont we have a 2 gear tranny with a redline of 18000rpms?

 

if you want a detailed lesson on Internal Combustion engines hit me up on Aim and I can tell you how it works, only time your not burning fuel is when the car is off.

 

you only lose about 2 mpg...at most, which is minimal IMO

 

Nope. I did not contradict myself, though it may seem that way.

Load and rpms are not the same. Just because your car is turning at higher rpms does not equate to more fuel except for a little bit of extra friction.

Load is how much power the car is making. If you are driving your car at 3,000 rpms going 50 mph in one gear and switch to another gear and go 50 mph at 4,000 rpms and keep the car at the same speed, it is not taking more fuel. In both instances, it takes the exact same amount of energy to make the car go. The weight of the car, the amount of rolling resistance, and wind resistance are consistent in both situations. The only thing different is the amount of internal engine friction.

What I was trying to show was that there really is not anything magical about gears that result in a loss of fuel economy, but I think drivers tend to run there cars more agressively when they have them.

Additionally, if you talk to most drivers who have made the switch they will tend to say that they experience the same fuel economy or loose about 1 - 2 mpg. For the most part, I think it is up to if the driver changes his driving habits with the new gears.

 

thats very true :brushteet

 

true and its hard enuff that our engines run up to what like 6200rpms.... theres no way in hell they can hit 18000rpms lol not even my bike can do that.....dumbass...it had to be a v6 guy lol

 

To further my point, I could drive my Suburban downhill at 3500 rpm or tow uphill at the same engine speed. While towing the load is much higher and so would my fuel usage.

 

I heard with 4.10s on a v6 it cuts ur top speed down to like ****in 80 is that true.

 

it was sarcasm jackass :tool:

 

I pretty much agree with Blake on this but I did a little diggin to see what I could come up with about gear changes and what happens to fuel economy.
I found on a couple other forums,(one of which was a truck forum for people who have tow vehicles) a couple replys to a similar Q was that switching from 3:73s to 4:10s would result in roughly 10% decrease in mileage runnin down the highway. Less load on the motor would increase your mileage in stop and go driving by that much or slightly more. I guess its personal preference.

 

no, it does drop the top speed alot but yuo still wont ever go that fast. hell the tranny in my car with 4.10 can still do 180mph. at 6k in 5th just to give an example but we will never see those speeds anyhow.

 

Hum, top speed and gears? Theoretically, your top speed will decrease by going from 3.27's to 4.10's.

Imagine if you could go down a steep grade for as long as you like, so the car is capable or being speed limited only by engine rpms. In this instance, your top speed will drop by going to 4.10's. It is a simple fact of life. In 5th gear at 6,000 rpms you will simply not be traveling as fast with 4.10's.

In reality, with 4.10's in 5th gear, you are higher into the power band and able to overcome wind resistance better than at the same speed at lower rpms with 3.27's. While I have never seen how fast my car could go before or after swapping gears, I have talked to people who have and they claim that their car actually achieved a higher top speed with 4.10's, but not by much.

 

e-catfight! e-catfight!

 

I have to agree with Blake on the first part. People who achieved more speed with lower gears were allowing the engine to be used to its fullest potential by decreasing load on it. But add enough ponies to the engine and you would run out of gear. I remember the Ferrari F355 specifically, it would run to the redline in top gear just about when it was runnin out of power to go any faster. If you put lower gears in you would lose a little top end.

 

Crap, Dustin and I have not agreed on things before. We always get through it. - LOL

Actually, if you read my post again, I was really not arguing with him. He is technically correct. Top speed should drop with 4.10's.

 

Crap, Dustin and I have not agreed on things before. We always get through it. - LOL

Actually, if you read my post again, I was really not arguing with him. He is technically correct. Top speed should drop with 4.10's and it does if you are not taking into account wind resistance. In truth, I have never actually seen anyone do a top speed check before and after a gear swap, so I am merely speculating.

 

My questions was for the v6. I know the gts can run it fine. From what im hearing 4.10s in a v6 you top out at like 80

 

I can't help you there. No experience with the 6'ers. Good point, though, I forget we were originally taking about a V-6.

 

Yeah. My dad told me that. He said I'd be nuts to go with 4 10s on a v6. I think I will take his word for it scince he used to drag race and restore cars.