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Old 01-04-2010, 06:55 PM   #1
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top end speed

whats the best way that i can get more acceleration in the higher gears, and a higher top speed? i have a 04 v6 auto.
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Old 01-04-2010, 06:58 PM   #2
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re: top end speed

4.10 gears.
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Old 01-04-2010, 07:31 PM   #3
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re: top end speed

More power is the simple answer to this.
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Old 01-04-2010, 07:46 PM   #4
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re: top end speed

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4.10 gears.
plus posi
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Old 01-04-2010, 08:58 PM   #5
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re: top end speed

Gears will increase your acceleration but will decrease your top speed. If you just want a higher top speed you can get the governor taking off by a hand held tuner. But is there need to go 140?!?!?
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Old 01-04-2010, 09:01 PM   #6
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re: top end speed

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Gears will increase your acceleration but will decrease your top speed. If you just want a higher top speed you can get the governor taking off by a hand held tuner. But is there need to go 140?!?!?
agreed. not sure if'd youd even be goin 140 though haha. maybe 130 with gov off. work on gettin off the line!
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Old 01-04-2010, 09:06 PM   #7
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re: top end speed

yes this is true, but what is the difficulty rating in replacing the gears? ive seen all over that auto needs 4.10, and man needs 3.73, but if i went with the 4.10 my gas mileage would be down the drain. and i no a crank pulley is like the difference maker in it. any ideas how i can fix how my rpms are never constant. when changing into 4th at about 2300 the rpms will drop to about 2000 then back to about 2400 then shift into 4th. could that be a programming problem or something internal?
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Old 01-04-2010, 10:24 PM   #8
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re: top end speed

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yes this is true, but what is the difficulty rating in replacing the gears? ive seen all over that auto needs 4.10, and man needs 3.73, but if i went with the 4.10 my gas mileage would be down the drain. and i no a crank pulley is like the difference maker in it. any ideas how i can fix how my rpms are never constant. when changing into 4th at about 2300 the rpms will drop to about 2000 then back to about 2400 then shift into 4th. could that be a programming problem or something internal?

Could be an IAC issue, could be a few different things actually. Quick question is what is the goal you have set for your car overall.
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Old 01-04-2010, 10:28 PM   #9
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re: top end speed

well, a few months ago, i went to the drag strip, and half of my teeth on my lsd broke off, and my wife wont let me drag anymore. but i still do some street racing. id also like to try some autocross when it comes back around near me, and i do plan on going back to the track again, just without the wife knowing, sshhh...
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Old 01-04-2010, 10:32 PM   #10
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re: top end speed

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Originally Posted by v6stang04 View Post
yes this is true, but what is the difficulty rating in replacing the gears? ive seen all over that auto needs 4.10, and man needs 3.73, but if i went with the 4.10 my gas mileage would be down the drain. and i no a crank pulley is like the difference maker in it. any ideas how i can fix how my rpms are never constant. when changing into 4th at about 2300 the rpms will drop to about 2000 then back to about 2400 then shift into 4th. could that be a programming problem or something internal?
Go with the 4.10's. I went from 2.73 to 3.73 and I use exactly 1 more gallon of gas per fill up driving to & from work. The rpms @ 75 went from 1800 to 2600. Going from 3.27 to 3.73 isn't worth it. I'm only staying with the 3.73 because I will be swapping to a 5spd in the near future. My car is begging for more gear. As far as difficulty rating, I would let a mechanic do it. The transmission should shift from third to fourth then the torque converter should lock in. ( extra few hundred rpm drop )
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Old 01-04-2010, 10:58 PM   #11
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re: top end speed

Yes more power will definitely net you the most improvement in top speed and acceleration...but in the mean time, as the others have said, taller gears (preferably 4.10s), tlok (if you don't already have one), and a solid tune will make you quicker down low. The tune alone will alter your shift points and firm them up so much you'll feel like you gained 30hp. From what I've heard, the slight decrease in mpg's is worth the rewards of 4.10 gears. Most who have autos and go with 3.73's regret it and wish they'd gone with 4.10's. If you are really concerned about mileage, you could do 3.90's, but I haven't seen them for a 7.5" rearend, only the 8.8".
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Old 01-04-2010, 11:10 PM   #12
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re: top end speed

What kind of decreases are ppl seeing (like numbers of mpg lost) 4 or more like 10?
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Old 01-04-2010, 11:27 PM   #13
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re: top end speed

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What kind of decreases are ppl seeing (like numbers of mpg lost) 4 or more like 10?
not even...many people from other forums are saying 1-1.5 mpgs lost with 4.10's, and most were v8's. You will see the biggest decrease if you do a ton of highway driving, and even then...1-1.5 mpgs??? no biggie to me
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Old 01-05-2010, 12:10 AM   #14
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re: top end speed

The in town mileage is a ton better kinda averages out.
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Old 01-05-2010, 12:11 AM   #15
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re: top end speed

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Originally Posted by sonicpony03 View Post
Yes more power will definitely net you the most improvement in top speed and acceleration...but in the mean time, as the others have said, taller gears (preferably 4.10s), tlok (if you don't already have one), and a solid tune will make you quicker down low. The tune alone will alter your shift points and firm them up so much you'll feel like you gained 30hp. From what I've heard, the slight decrease in mpg's is worth the rewards of 4.10 gears. Most who have autos and go with 3.73's regret it and wish they'd gone with 4.10's. If you are really concerned about mileage, you could do 3.90's, but I haven't seen them for a 7.5" rearend, only the 8.8".
I'm a prime example of regret.
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Old 01-05-2010, 05:08 AM   #16
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re: top end speed

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not even...many people from other forums are saying 1-1.5 mpgs lost with 4.10's, and most were v8's. You will see the biggest decrease if you do a ton of highway driving, and even then...1-1.5 mpgs??? no biggie to me
i dont notice a difference really, i still stop for gas the same days every week!
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Old 01-05-2010, 01:32 PM   #17
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re: top end speed

i was also kinda worried about age mileage. 1- 1.5 is great news
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Old 01-05-2010, 01:37 PM   #18
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re: top end speed

how much on average would the install cost for a shop to do it, i know it varies on the kind of shop, and how fast they can do it, and the rack fees and everything. but on average, what would it cost?
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Old 01-05-2010, 01:38 PM   #19
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re: top end speed

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how much on average would the install cost for a shop to do it, i know it varies on the kind of shop, and how fast they can do it, and the rack fees and everything. but on average, what would it cost?
for gears? i am getting my 4.10's + tlok on this week for $250 but others have told me - expect to pay up to $400.
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Old 01-05-2010, 01:46 PM   #20
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re: top end speed

well i just replaced the lsd with a ford racing lsd, so i wnt be getting a tlok, just the gears, ive read articles on how to do it, i just dnt no if when i would put it all in and back together if i would miss something really small and not even notice it, or if i were to think something is right, and it end up not being right.
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Old 01-05-2010, 01:55 PM   #21
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re: top end speed

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well i just replaced the lsd with a ford racing lsd, so i wnt be getting a tlok, just the gears, ive read articles on how to do it, i just dnt no if when i would put it all in and back together if i would miss something really small and not even notice it, or if i were to think something is right, and it end up not being right.
Gears are one of those things where you don't want to take chances. Unless you've successfully installed them before, I wouldn't attempt it. Even with all the proper tools you can still miss something or do something incorrectly. It's all about detail and precision. Experience plays a large part in installing gears. There have been a couple members who attempted to install them and almost succeeded, but made one mistake and ended up having to have it redone by a professional. Then it costs quite a bit for them to fix it.

Just make sure to have whoever is installing it write up and sign a warranty for their work. Usually you won't have this issue with a Ford dealership. However, most Ford dealerships won't install anything other than Ford...
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Old 01-05-2010, 02:05 PM   #22
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re: top end speed

well i have a pretty well known shop, in our local area anyways. they also do special made parts. i know i can get the gears from am, but does anyone no of some place thats cheaper, or are theirs gonna be the cheapest around?
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Old 01-05-2010, 02:12 PM   #23
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re: top end speed

Well through a quick google search, I found motives for $142 from nationaldrivetrain.com.
I've never heard of them nor do I now anyone who has dealt with them. Personally, for $20 more, you get piece in mind with American Muscle...I'd say they're the cheapest around.

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Old 01-05-2010, 02:31 PM   #24
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re: top end speed

when i had the lsd replaced, i used the motive gear bearings, gaskets and everything else, its worked good so far. im also looking for something that will be strong and not break after a few months, or if like last time, go to the track and break half the teeth off of my lsd, that was a nightmare driving home that night.
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Old 01-05-2010, 02:38 PM   #25
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re: top end speed

Was your first tlok used before you had it installed?
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Old 01-05-2010, 02:44 PM   #26
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re: top end speed

the one i have in there now, is only the 2nd one ever in the car.
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Old 01-05-2010, 04:59 PM   #27
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re: top end speed

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when i had the lsd replaced, i used the motive gear bearings, gaskets and everything else, its worked good so far. im also looking for something that will be strong and not break after a few months, or if like last time, go to the track and break half the teeth off of my lsd, that was a nightmare driving home that night.
8.8
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Old 01-05-2010, 05:00 PM   #28
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re: top end speed

7.5
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Old 01-05-2010, 05:37 PM   #29
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7.5
You said you was looking for something that wouldn't break. 8.8 !!
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Old 01-05-2010, 05:45 PM   #30
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Re: top end speed

I'v heard a lot of people talk about how the 7.5 pooping out on them.
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Old 01-05-2010, 06:53 PM   #31
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Re: top end speed

i never said anything about my having an 8.8. i was surprised when they told me what i did, what they said was that there is a lot of extra slack when the rear end is not moving, and i guess the all of a sudden jerk, grinded half the teeth off.
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Old 01-05-2010, 07:20 PM   #32
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Re: top end speed

7.5 will be fine as long as your not pushing over 300hp on your v6. shouldnt "poop out" to easily
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Old 01-05-2010, 07:29 PM   #33
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Re: top end speed

well im not to sure on how much hp it has right now. i know they come standard with 193, it should be closing in on 300 here shortly, ill gain some more if i retune it. thats another question i have, when i tried to tune it, it said i had to unplug the FMP fuel fuse or something like that. can anyone tell me what or where that is.
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Old 01-05-2010, 08:50 PM   #34
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Re: top end speed

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I'v heard a lot of people talk about how the 7.5 pooping out on them.
They've been pooping out since ford started making them. That's why ford canned them from the V8 line in 1986.
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Old 01-05-2010, 09:02 PM   #35
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Re: top end speed

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They've been pooping out since ford started making them. That's why ford canned them from the V8 line in 1986.
lol, Yah and then made them our problem once we start putting down some real power.
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