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Old 08-19-2006, 01:17 PM   #1
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4.10 gears

Everybody says that 4.10 gears are really bad in gas but exactly how bad? Is it as bad as having a GT or worst?

I have a automatic 2004 V6 and most of my driving is in the city???
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Old 08-19-2006, 03:35 PM   #2
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Re: 4.10 gears

If most of your driving is in the city you might actually see an increase in gas mileage if you can keep your foot off the little right pedal.
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Old 08-19-2006, 04:03 PM   #3
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Re: 4.10 gears

ill be getting mine put in on tuesday, ill keep ya updated. i have a 03 v6 auto
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Old 08-20-2006, 02:19 AM   #4
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Re: 4.10 gears

Thank you
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Old 08-20-2006, 02:31 AM   #5
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Re: 4.10 gears

gas mileage does not get hurt too bad, just get them. Although it makes it alort harder to resist flooring it often. Remeber you will need a tune if you have an automatic to correct yoru speedometer due to the gear change.
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Old 08-20-2006, 09:31 AM   #6
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Re: 4.10 gears

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Originally Posted by STEVE View Post
gas mileage does not get hurt too bad, just get them. Although it makes it alort harder to resist flooring it often. Remeber you will need a tune if you have an automatic to correct yoru speedometer due to the gear change.
That is correct. On 99+ autos you have to get a chip or tuner to compensate for the gear change.

On a manual you can get away with a speed-cal adjuster.
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Old 08-20-2006, 12:47 PM   #7
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Re: 4.10 gears

Here is the deal 4.10's are cool but in the real world unless you are a track dog you really wont notice the difference between 4.10's and 3.73's You say most of the miles you use is City then you will be OK but with gas prices as high as they are you will notice the drop in fuel mileage with 4.10's at 75mph on the interstate. basically you will cut around 40 miles off per tank. It is all in what is important. It is your car and you decide.

4.10's are cool but 3.73's are not to shabby either.
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Old 08-20-2006, 03:41 PM   #8
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Re: 4.10 gears

I was thinking of the 3.73 but people the get them always regret getting them instead of the 4.10
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Old 08-20-2006, 03:45 PM   #9
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Re: 4.10 gears

I'd get the 4.10s. I had them in the '90 for a while and wish I would never have gotten rid of them. The small trade-off in mileage is worth it for the extra punch in my opinion.
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Old 08-20-2006, 06:35 PM   #10
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Re: 4.10 gears

I started with 3.73's and now have 4.10's Should have made the big jump first.

I was lucky and a friend needed 3.73's so I was able to resell them.
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Old 08-20-2006, 06:44 PM   #11
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Re: 4.10 gears

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Here is the deal 4.10's are cool but in the real world unless you are a track dog you really wont notice the difference between 4.10's and 3.73's You say most of the miles you use is City then you will be OK but with gas prices as high as they are you will notice the drop in fuel mileage with 4.10's at 75mph on the interstate. basically you will cut around 40 miles off per tank. It is all in what is important. It is your car and you decide.

4.10's are cool but 3.73's are not to shabby either.
I beg to differ, I have driven my friends car with 3.73's (stick) and my car has 4.10's (stick). My car seems quite a bit quicker, we both have the same other mods too ebay cai, and magnaflows.
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Old 08-20-2006, 06:53 PM   #12
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Re: 4.10 gears

In daily driving I noticed a very measurable difference.
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Old 08-31-2006, 03:37 PM   #13
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Re: 4.10 gears

how much do those cost + install?
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Old 08-31-2006, 03:42 PM   #14
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Re: 4.10 gears

You are also forgetting and auto has worse gearing compared to a manual tranny'd mustang. The final gear ratio (calculating though the transmission) as you go though the gears will be closer to a manual with 4.10s compared to 3.73s. I would go 4.10s dont fear the gear.

Gear install is a tricky thing... the shop needs to know HOW to do it. You simply can not just bolt them up and go. They have to be installed to a specific spec including but not limited to: backlash, pinion depth, crush sleeve set right, pattern matching, etc. If a shop does not know how to do those things or even what they are I wouldnt let them touch it. Also, its far better to pay more for a better job than save a little and wind up having to redo EVERYTHING due to you didnt get the job done right. Just a bit of advice I fell victim to myself.
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Old 08-31-2006, 04:32 PM   #15
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Re: 4.10 gears

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In daily driving I noticed a very measurable difference.
Really??? Kirk you are a lead foot!!! Actual normal driving should actually be no different except for a faster rise in RPM
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Old 08-31-2006, 04:41 PM   #16
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Re: 4.10 gears

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Originally Posted by STEVE View Post
I beg to differ, I have driven my friends car with 3.73's (stick) and my car has 4.10's (stick). My car seems quite a bit quicker, we both have the same other mods too ebay cai, and magnaflows.
Street racing again???? As I said in normal driving is not as noticable. On the track that is different. As I said before if you are not going to go to the track a lot I would go with cheaper fuel and get the 3.73's. If you are going to go to the track get 4.10'. Most of you are young and not nearly as sensible in this approach. Consider the long run in a couple of years when fuel is $5.00 a gallon.
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Old 08-31-2006, 06:27 PM   #17
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Re: 4.10 gears

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Street racing again???? As I said in normal driving is not as noticable. On the track that is different. As I said before if you are not going to go to the track a lot I would go with cheaper fuel and get the 3.73's. If you are going to go to the track get 4.10'. Most of you are young and not nearly as sensible i this approach. Consider the long run in a couple of years when fuel is $5.00 a gallon.
I could notice a difference in normal driving when I went to 4.10s to 3.73s. That's a pretty big jump... Hence, a lot of people are starting to use the 3.90s which are a good compromise.
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Old 08-31-2006, 06:37 PM   #18
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Re: 4.10 gears

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I could notice a difference in normal driving when I went to 4.10s to 3.73s. That's a pretty big jump... Hence, a lot of people are starting to use the 3.90s which are a good compromise.

How the hell do you notice it in NORMAL driving as in normal city driving unless you lead foot and really so what if there is minimal notice. For the reality of it is if you dont go to the track or street race then it is just a choice of mileage.

Once again it is up to the individual and preference. I have never said he should get either I just throw out options and what is his desire to improve. I also want to point out that will gas might be in a slight decline as of right now the world continues to use more gas and increased gas prices will have an effect.

Just something to think about
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Old 08-31-2006, 06:47 PM   #19
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Re: 4.10 gears

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How the hell do you notice it in NORMAL driving as in normal city driving unless you lead foot and really so what if there is minimal notice. For the reality of it is if you dont go to the track or street race then it is just a choice of mileage.

Once again it is up to the individual and preference. I have never said he should get either I just throw out options and what is his desire to improve. I also want to point out that will gas might be in a slight decline as of right now the world continues to use more gas and increased gas prices will have an effect.

Just something to think about
I consider it pretty normal to stomp on the gas every once in a while, especially getting out on the highway. I don't drive around like Speed Racer all the freakin' time like some, but what's the point of spending money on performance parts if you aren't going to have a little fun with them?
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Old 08-31-2006, 07:33 PM   #20
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Re: 4.10 gears

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I consider it pretty normal to stomp on the gas every once in a while, especially getting out on the highway. I don't drive around like Speed Racer all the freakin' time like some, but what's the point of spending money on performance parts if you aren't going to have a little fun with them?
Never said that stomping is not fun. I do it all the time but are you trying to say 3.73's are not fun. If so that is a rather asinine statement.

We here are trying to give people good information and OPTIONS!!! If we are going to be like the other mustang sites and be Nazi's about what we suggest we might as well just move over there with those nimrods.

But alas we are different and opinions are good and options are even cooler. We here seem to be heading into that rutt. I will not assimilate to one option or opinion. There are to many good products or options and reason for the differences.
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Old 08-31-2006, 08:31 PM   #21
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Re: 4.10 gears

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Never said that either stomping is not fun. I do it all the time but are you trying to say 3.73's are not fun. If so that is a rather asinine statement.

We here are trying to give people good information and OPTIONS!!! If we are going to be like the other mustang sites and be Nazi's about what we suggest we might as well just move over there with those nimrods.

But alas we are different and opinions are good and options are even cooler. We here seem to be heading into that rutt. I will not assimilate to one option or opinion. There are to many good products or options and reason for the differences.


To the Thunderdome!!!

Seriously though, I did not, nor will I ever say 3.73s aren't fun. I just said that I could tell a difference between them and 4.10s in every day driving, which I could. I personally would kinda rather have the 3.73s for a daily driver. Kinda. It really depends a lot on the car and the driver too though.

The OP has an automatic V6. Lower gears are more important to an automatic V6 than they are to a ~300rwhp 5.0 with a T5. Which is why I recommend he go with the lower gear. Not to mention the fact that he said most of his driving is done in the city. This means the difference in mileage for him will be pretty negligible.
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Old 08-31-2006, 09:38 PM   #22
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Re: 4.10 gears

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To the Thunderdome!!!

Seriously though, I did not, nor will I ever say 3.73s aren't fun. I just said that I could tell a difference between them and 4.10s in every day driving, which I could. I personally would kinda rather have the 3.73s for a daily driver. Kinda. It really depends a lot on the car and the driver too though.

The OP has an automatic V6. Lower gears are more important to an automatic V6 than they are to a ~300rwhp 5.0 with a T5. Which is why I recommend he go with the lower gear. Not to mention the fact that he said most of his driving is done in the city. This means the difference in mileage for him will be pretty negligible.

I would agree
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Old 09-01-2006, 12:38 AM   #23
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Re: 4.10 gears

My foot is a bit heavy, I would definatly notice the difference in normal driving.
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Old 09-01-2006, 12:39 AM   #24
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Re: 4.10 gears

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Street racing again????
Me? No, never.
Just spirited driving with friends.
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Old 09-01-2006, 06:56 AM   #25
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Re: 4.10 gears

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Me? No, never.
Just spirited driving with friends.
Sure you're not. Your atheist *** is going to hell????
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Old 09-28-2006, 02:24 AM   #26
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Re: 4.10 gears

last questions about gears. if i get 4.10 do i still be able to s/c my car
and if i get 3.73 will i feel a big difference from stock gears
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Old 09-28-2006, 07:03 AM   #27
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Re: 4.10 gears

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last questions about gears. if i get 4.10 do i still be able to s/c my car
and if i get 3.73 will i feel a big difference from stock gears
Yes and yes.
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Old 09-28-2006, 10:05 AM   #28
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Re: 4.10 gears

get the 4.10's, i do alot of highway driving everyday to and from work and and a bunch of city driving and i still get about 21 mpg:woo: ...and if your going into your rear end, get the t-lok. bcuz your going to be spinning that single wheel alot if you dont get the t-lok. i cant keep track of how many times a day i am making a sharp turn from a stop and the tires break loose a little and im not even on the gas that much, so imagine how the single wheel will react...just my $.02
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Old 09-30-2006, 08:49 PM   #29
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Re: 4.10 gears

I'm also considering going w/ different gears and I was wondering if someone might know what the rpms would be if I were going 70 mph on the freeway w/ 3.73s and 4.10s. Maybe someone that's got them can try it out for me. My car going 70 is at 2100 rpms. When I hit the O/D it goes up to 3100, I think, but that's too much. I'd like my car to cruise around 2.5k or 2.6k.
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Old 09-30-2006, 08:53 PM   #30
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Re: 4.10 gears

if you want your car to cruise around at 2.5 idk if you want to go with gears at all. i cruise at around 75-80 and the rpms run at 3k and higher. and with over drive...well lets not talk about o/d...
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Old 10-01-2006, 06:05 PM   #31
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Re: 4.10 gears

Driving around the city I get bad mialage, but that's from my driving, but when I was moving up to college I got 22-23 mpg cruising at about 70-75mph.
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Old 10-01-2006, 06:23 PM   #32
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Re: 4.10 gears

I would go for 4.10s
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Old 06-04-2008, 07:33 PM   #33
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Re: 4.10 gears

I have a 4.10 in my 1991 5.0....and my speedometer is all out of whack. I have heard different things, from buying a pack of gears and by trial and error figuring out which one you need, to having to mess with the tranny. Anyone know by experience what to do?
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Old 06-04-2008, 10:50 PM   #34
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Re: 4.10 gears

you can get the black 6 gear tooth for the output shaft and then get the 21 tooth for the speedo cable.....that will get your speedo back to stock for 4.10's......i have the 6 tooth and an 18 tooth for my 3.73's and my speedo is dead on.
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