gears for a 04 3.9 mustang - Mustang Evolution

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Old 04-16-2009, 11:25 AM   #1
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gears for a 04 3.9 mustang

what kinda gears would be good for my 04 3.9 mustang? i know NOTHING about this department so any help would be great! i hear it will improve acceleration and thats what im looking for? how much would they cost to get and whats a ball park on the cost of installing? thanks for the help!
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Old 04-16-2009, 11:57 AM   #2
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Re: gears for a 04 3.9 mustang

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what kinda gears would be good for my 04 3.9 mustang? i know NOTHING about this department so any help would be great! i hear it will improve acceleration and thats what im looking for? how much would they cost to get and whats a ball park on the cost of installing? thanks for the help!
Auto - 3.73-4.10
5 Speed - 3.73-3.90
IMO
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Old 04-16-2009, 12:03 PM   #3
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Re: gears for a 04 3.9 mustang

Saleen Fiend is right on with the gear ratios.
I've heard at least $400 for an install for the gears...but then you want a shop/person who is going to do it right the first time.

Here is a quote from the almighty Spec a while back. I saved it myself since it was quite helpful:

"dont skimp on this install as doing it wrong can cost you much more than just a redo as once the gears get worn wrong.. you have to buy new ones.

Basically if the shop tells you when they install them they set the backlash, pinion crush sleeve, gear wear pattern and the likes then they know what they are doing, you dont just bolt them up and go.

Get a warranty (here is the tricky part for some) IN WRITING stating that you are covered for X miles from whine or breakage or any other issues. If one of the little bolts around the ring gear comes off say bye bye to the entire rear end."
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Old 04-16-2009, 12:10 PM   #4
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Re: gears for a 04 3.9 mustang

thanks guys! this prick at the auto shop just gave me a $700 QUOTE lol! i take it i better shop around lol! if this is a ball park price then would the results be worth that kinda of money?
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Old 04-16-2009, 12:20 PM   #5
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Re: gears for a 04 3.9 mustang

If you install a tlok along with the gears I'm guessing it would be worth it. Gears/tlok installs are pricey, but they are an effective mod. You'll also have to tune afterwards to adjust the speedo.

I'd also think about where you want to go with the car. I see in your sig that you are working on a turbo. You may want to upgrade to an 8.8 inch rearend from a GT to support the f/i power. Its stronger than the stock 7.5 and you could just swap out the gears for the ones you want.
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Old 04-16-2009, 01:25 PM   #6
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Re: gears for a 04 3.9 mustang

Mustang Cobra 8.8" Ford Racing 3.73 Rear End Gears
Ford Racing 3.73 Ring & Pinion Kit M-4209-F373N
This Brand New Ford kit comes complete with the Following:

- 3.73 Ring & Pinion Gears M-4209-F373N
- Ford Pinion Shim Kit
- Ford Pinion Nut
- Ford Crush Sleeve
- Made by Ford NOT Motive


This is what im looking to go with! even though its for a cobra would this fit my car?
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Old 04-16-2009, 02:27 PM   #7
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Re: gears for a 04 3.9 mustang

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Originally Posted by Zebs5408 View Post
Mustang Cobra 8.8" Ford Racing 3.73 Rear End Gears
Ford Racing 3.73 Ring & Pinion Kit M-4209-F373N
This Brand New Ford kit comes complete with the Following:

- 3.73 Ring & Pinion Gears M-4209-F373N
- Ford Pinion Shim Kit
- Ford Pinion Nut
- Ford Crush Sleeve
- Made by Ford NOT Motive


This is what im looking to go with! even though its for a cobra would this fit my car?
That will fit any 8.8 Rear End. If you have a V6 you have a 7.5 Rear End
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Old 04-16-2009, 05:10 PM   #8
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Re: gears for a 04 3.9 mustang

Yah, if it says it is for a 8.8 rear, its not going to work. You have to find gears that are for the 7.5 rear.

American Muscle has the Motive Racing ones, other places have the FRPP ones.
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Old 04-17-2009, 02:22 PM   #9
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Re: gears for a 04 3.9 mustang

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how do these look? there used 3.73 gears with a used t lock! he said theyll fit any ford 7.5" rear end! the guy says the t lock needs new bearing? he wants $200 for these! what you guys think?
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Old 04-17-2009, 02:51 PM   #10
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Re: gears for a 04 3.9 mustang

The t-lok can be rebuild so for 200 it's not a bad deal I personal wouldn't install used gears
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Old 04-17-2009, 03:07 PM   #11
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Re: gears for a 04 3.9 mustang

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The t-lok can be rebuild so for 200 it's not a bad deal I personal wouldn't install used gears
Why? You don't like the whine or roars associated with it?
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Old 04-17-2009, 06:17 PM   #12
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Re: gears for a 04 3.9 mustang

so if u were me u would go with new gears? i heard if there oem there still good as long as there not cheap after market ones! so what kinda power can i expect by adding 3.73 gears with t lock
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Old 04-17-2009, 07:31 PM   #13
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Re: gears for a 04 3.9 mustang

It doesn't add power, just gets you into your power band quicker.

I thought with turbo set ups you're suppose to stick with the stock gearing to help the turbo do it's thing.
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Old 04-17-2009, 07:40 PM   #14
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Re: gears for a 04 3.9 mustang

so wait a min.....i want get any performance difference from the gears? ive heard all these storys that it really makes you get up and go! that u can really feel the take off difference and makes it feel like a v8! any truth to this?
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Old 04-17-2009, 09:35 PM   #15
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Re: gears for a 04 3.9 mustang

Gears allow your car to reach its powerpand or potential much quicker! It then allows you to use all that acceleration much quicker. It does not produce any HP or TQ numbers.

By adding gears you are multiplying the intensity of the acceleration in your rear axle. You will notice a signifigant diferance in the vehicle and will love it. It is hands down one of the best mods of any vehicle.

Most of the stock lower gear ratios leave a power band in an undesired area such as 100+ but at that point your transmission is robbing the veh of thats powerband. The gears allow that powerband to be present earlier along the RPM range.
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Old 04-21-2009, 10:15 PM   #16
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Re: gears for a 04 3.9 mustang

ok gentlement i got a set of used 7.5" 3.73 gears with a t-lok! now my question is i bought a "motive" 7.5" 3.73 installation kit and but im not sure what brand the gears are! now do the brand of the gears and installation kit have to match? or is a Motive 7.5" 3.73 installation kit for any 7.5" 3.73 gears? and is there anything i need to do before installing them? like clean them up or anything? and they been inspected and said to be in "great shape"! any help would be great!
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Old 04-22-2009, 08:42 AM   #17
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Re: gears for a 04 3.9 mustang

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ok gentlement i got a set of used 7.5" 3.73 gears with a t-lok! now my question is i bought a "motive" 7.5" 3.73 installation kit and but im not sure what brand the gears are! now do the brand of the gears and installation kit have to match? or is a Motive 7.5" 3.73 installation kit for any 7.5" 3.73 gears? and is there anything i need to do before installing them? like clean them up or anything? and they been inspected and said to be in "great shape"! any help would be great!
Gears and Install kit do not need to match. And Unless there is something unusual about the gears there is not really a cleaning?? Make sure you check run out on the differential and have someone install them that knows what they are doing.
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Old 04-22-2009, 09:18 AM   #18
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Re: gears for a 04 3.9 mustang

thanks i have never messed with gears before so i didnt know if they need to be cleaned up or whatnot! but yes im having them proffesionally installed at a well known shop in town! i honestly am not ready nor have the time to install something that critical! thanks for the help man!
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Old 04-22-2009, 11:22 AM   #19
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Re: gears for a 04 3.9 mustang

you will have to get the speedometer calibrated (a tuner or a speed cal unit) or it will be off and the odometer will also read faster
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Old 04-22-2009, 11:40 AM   #20
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Re: gears for a 04 3.9 mustang

yea i heard about that! i have a predator diablo tuner! im pretty sure i can adjust it on that but not sure how...any advice?
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Old 04-22-2009, 12:13 PM   #21
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Re: gears for a 04 3.9 mustang

Do you have the manual that comes with the tuner? All the info is in that. It's really easy to do. If not, just plug it in and look around on the tuner. I forgot the exact steps but you won't mess anything up just poking around with it.
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Old 04-22-2009, 03:43 PM   #22
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Re: gears for a 04 3.9 mustang

will do bro thanks! i was looking around on other forums and this guy said his 0-60 take off is in the 5 sec range now that he has gears on his slightly moded v6! ( the mods were true dual exhuast and a intake i think) any truth to that? my mods are almost the same so that would be sweet but i just dont see it happening unless the gears are alot more serious than i thought (which would be kick ***)
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Old 04-22-2009, 04:34 PM   #23
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Re: gears for a 04 3.9 mustang

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will do bro thanks! i was looking around on other forums and this guy said his 0-60 take off is in the 5 sec range now that he has gears on his slightly moded v6! ( the mods were true dual exhuast and a intake i think) any truth to that? my mods are almost the same so that would be sweet but i just dont see it happening unless the gears are alot more serious than i thought (which would be kick ***)
Is that the guy we are talking about?
http://www.mustangevolution.com/forum/t111524/
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Old 04-22-2009, 09:04 PM   #24
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Re: gears for a 04 3.9 mustang

LOL....Not that i know of i saw it in another forum but it might have been him...it sounds like a load of crap he would say! anyway i thought i would ask! does anybody know with my mods listed that i have a ball park of what my 0-60 would be after posi and 3.73 gears? thanks for the help!
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Old 04-23-2009, 02:34 AM   #25
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Re: gears for a 04 3.9 mustang

Less than it is now...


3.73's are great for a stick, 4.10's are worthless. Waaaaay too short, I'd only recommend them for an auto.
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Old 04-24-2009, 06:30 PM   #26
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Re: gears for a 04 3.9 mustang

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LOL....Not that i know of i saw it in another forum but it might have been him...it sounds like a load of crap he would say! anyway i thought i would ask! does anybody know with my mods listed that i have a ball park of what my 0-60 would be after posi and 3.73 gears? thanks for the help!
You should see an increase of .2 to .3 through 60 and the quarter, it's usually the same amount because 0-60 is a race to a speed and the 1/4 is a race to a distance, they end up being about the same improvement.

I just did this on my 4.0 with intake exhaust and a tune, I can walk a hemi charger from a roll, probably not off the line but the posi definitely makes it closer.
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Old 04-27-2009, 06:07 PM   #27
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Re: gears for a 04 3.9 mustang

aight gentlemen i have my appt at 8am in the morning to have the gears and t lok installed! when i was dropping it off this afternoon i asked the guy "am i really gonna be able to feel the difference?" he asked what kinda of gears i had on now! i said "3.27" he said "no u really want be able to tell the difference"......im hurt lol! you guys all know that excited feeling u get as u have a new mod added to your car? well he has destroyed that feelin is he just messin with me or is he forreal? i have asked this question before and i was told that its the most effective mod on a v6 besides the obvious turbo, supercharger! i need that excitment back gentlemen! is this baby gonna get up and go or what?
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Old 04-27-2009, 07:41 PM   #28
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Re: gears for a 04 3.9 mustang

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aight gentlemen i have my appt at 8am in the morning to have the gears and t lok installed! when i was dropping it off this afternoon i asked the guy "am i really gonna be able to feel the difference?" he asked what kinda of gears i had on now! i said "3.27" he said "no u really want be able to tell the difference"......im hurt lol! you guys all know that excited feeling u get as u have a new mod added to your car? well he has destroyed that feelin is he just messin with me or is he forreal? i have asked this question before and i was told that its the most effective mod on a v6 besides the obvious turbo, supercharger! i need that excitment back gentlemen! is this baby gonna get up and go or what?
There will be a difference but here's an analogy, I test drove the 2008 4.0 and the GT a day apart (not back to back) and after 24 hours of down time between they feel like the same car. So the gears wont really feel too different but they definitely make a difference, you'll probably be pulling about 10 cars more at the end of a quarter than you were, and there are a lot of other cars that fit into that gap, so cars that you would have lost to you will now beat, you won't necessarily be smoking them, but you'll notice a lot more wins
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Old 04-27-2009, 08:38 PM   #29
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Re: gears for a 04 3.9 mustang

thanks man! im a grown *** man bro but that man hurt my feelings lol! im looking forward to the take off! thats the thing my car is lacking is a good launch! im hoping this will do the trick! ill let u know tomorrow nite!
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Old 04-27-2009, 09:38 PM   #30
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Re: gears for a 04 3.9 mustang

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thanks man! im a grown *** man bro but that man hurt my feelings lol! im looking forward to the take off! thats the thing my car is lacking is a good launch! im hoping this will do the trick! ill let u know tomorrow nite!
Off the line will be night and day, forgot to mention that part... Lol, the launch alone will be a huge advantage because it just gets up and goes no matter what, and you can still burnout if you absolutely have to, drop it at 4k and leave two stripes on the ground for once, LOL let me know how it feels, I just did this mod last week,well worth it!
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Old 04-28-2009, 08:43 AM   #31
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Re: gears for a 04 3.9 mustang

ill let u know in about 6-8 hrs! its in the shop now! im watching the clock lol! i love this feeling man lol
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Old 04-28-2009, 06:15 PM   #32
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Re: gears for a 04 3.9 mustang

I picked my car up 4 hrs ago and just now got done driving it LOL....all i can say is WOWWWWWWW! 2nd and 3rd gear u can really and i mean really feel the difference! THANKS TO EVERYBODY! i apperciate all the help and answers everybody has giving me! NOW ITS TRACK TIME!
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04' mustang 3.9 40th Anniversary Edition- (V2 Vortech Supercharger, 38# injectors, 3.73 gears w/ T-lok, Predator Diablo, Mac cold air intake, Port & polished upper AND lower intake manifold, Mac Long Tube Headers, Mac o/r H pipe, flowmasters, 2.5 flowmaster tips)


03' Mustang GT (20" Cobra R's, 40 series Flowmasters)
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Old 04-28-2009, 07:12 PM   #33
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Re: gears for a 04 3.9 mustang

Be careful in the rain until you get used to it.
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Old 04-29-2009, 07:38 AM   #34
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Re: gears for a 04 3.9 mustang

yea i bet it gonna be tricky! i alreayd look like idiot trying to spin tires doing a U turn yesterday! i didnt realize how much different it would be and instead of the car spinning a few and takin off i just went all the way around in a half cicle lol! i was probably frowned upon by other ppl in traffic lol! but hey it was fun to me!
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04' mustang 3.9 40th Anniversary Edition- (V2 Vortech Supercharger, 38# injectors, 3.73 gears w/ T-lok, Predator Diablo, Mac cold air intake, Port & polished upper AND lower intake manifold, Mac Long Tube Headers, Mac o/r H pipe, flowmasters, 2.5 flowmaster tips)


03' Mustang GT (20" Cobra R's, 40 series Flowmasters)
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