NEW GEARS 3:55 or 3:73
 

Hey;

Getting new gears
But which to get?

2004 GT
5 SPEED

I do quite a bit of highway driving but also do a lot of AROUND TOWN driving

I am just under 1500 RPM in 5th at 100KM/HR with the stock gears

I dont want to loose my gas milegae(I know I will loose some but thats why I am not going 4:10)

I am getting 32MPG highway

Are there any charts or anything that shows the RPM in each gear per REAR END RATIO?

Please let mw know all your opinions and what you are all running!

I was told by many I might as well go 3:73?

Thanks!

3.73, night and day difference compared to stock.
u won't be disappointed.
:tup

If I had the 4.6 id be going with 4.10's, but really I wouldn't go any less the 3.73's....
If you had a monster motor then id say go 3.55

4.10s dude!!! I do alot of driving back and forth between Kitchener and London and with the 4.10's and a tune its still great on the highway. I have a 2002 GT 5spd.

4:10 + 4.6 = dead sexay. The fun factor more than makes up for the drop in gas mileage from 3:73's.

To be perfectly honest on the highway I didn't notice a HUGE drop going from my 3.27 to my 4.10 as long as you set the cruise you're laughing. I actually noticed better in the city after a gear changed.

I think I am going to go with the 3:73
Seems to be the best of both worlds

I find 3.73's are fine on the highway. Fuel economy is good. Revs are reasonable. 3.55's would be a waste of money in my view.

^^^what he said^^^

Anyone know a good place online to buy my 3:73?
Does it matter which "BRAND" I get?

When you get them, let us know the RPM's you spin with the gears, I was thinking about doing the same, i get great milage with the stock setup.

Thanks,

Grant

I am partial to Ford Racing goodies. That's just me though:tup

:tup:chacha:

Personally I think 3:73`s are the magic gear,... but if you do ALOT of highway you might want the 3:55.

ford racing gears
:tup

3.73's in a 4.6 mustang is....:bleh:
Been there,and disliked it,to tell you the truth,didn't even notice the gear change from 3.27 to 3.73,lasted a year with 3.73's,then went to 4.10's,and never looked backed.When you think about it,it really isn't much of a jump in gears like the old 5.0 stangs which had 2.73's or 3.08's,then going to 3.73 really wakes them up,but the 4.6 lacks in torque,doesn't start making any til around 3000 or so rpm.In my opininon,if someone wants to do 3.73's in a n/a 4.6 equipped stang,just leave the stockers in there.Save your money.
I have said this once,and i will say it again,anyone giving you advise on gears for your "MODULAR" stang,and have had no expirience with them on a day to day basis,they are wasting there breath.Old school pushrod engines,and the modular over head cam engines have nothing in comparisson to each other when it comes to rpm,hp,and torque.
If you plan on getting the stang blown,yeah,i can see why the 3.73's will be more appropriate.
But if you plan on staying n/a,and want your moneys worth out of a gear swap,and laybour,go with 4.10's minumum.:tup
Do a search on the web,especially modular stang specific web sites,98.5 percent will say 4.10's for a daily driven stang.The other percentage are usually blown.
I'm no expert,but i've done both 5.0,and 4.6.
3.73's in a 5.0L is perfect for everyday usage,and 4.10 in a 4.6 stang is perfect for everyday usage.:wink:

There should be a sticky on this chart i will post up again that i read in a old mustang 'zine......

5.0L to 4.6L
3.55 = 3.73
3.73 = 4.10
4.10 = 4.30

And stick with Ford Racing for the gears.:)

What is your RPM crusing in 5th?
Hows the MPG?
How is 1st with the 4:10's?

When in 5th at 120 kph,she rev's at 2500 rpm(+ or -,depending on the tach's accurassy).
First gear is short at quick accelaration,but under normal driving,feels pretty normal,but shorter then with the stock 3.27's obviously.
The fifth gear still feels like an overdrive with the 4.10's as the fifth gear ratio in the tremec 3650 is .62,no balls so to speak as you would still need to drop to 4th when wanting to do a quick pass around someone on the highway. :wink:

good post 1low03gt

:chacha: Well put Jay.

Thanks guys!!:biggrin:

I'm running 4:10s and a KenneBell and imo it's 410s all the way on the 4.6 2V

mine's a street car and the 4:10s transform the driveability of the car regardless of the blower

Actually,in the current issue of Muscle Mustangs,they installed 4.10's in their project '99 GT mustang that they originally had 3.73's put in a few issues back.They recommend nothing less for the 4.6.Here is the quote....
They originally had 3.73's,and took the advice,and felt the need to up grade....just like i did! :wink:
See it to often. :confused:
4.10's in a 4.6 stang are not what most would think.

Attachment 21487

:biggrin:

If you are pining on the 32 mpg highway you are getting then obviously MPG is more important than SNORT so stick with the 3:31 gear and be light on the throttle go to the coffee shop and chat with your buddies about how you get 32 MPG with her.

Or say to hell with the gas mileage (sure not why I bought my Mustang) fire in a set of 4:10's stomp on it and disturb the peace for a change.

Who gives a $hit what the RPM's and mileage is? If that is what you are looking for get a Ford Focus not a Mustang.

at americanmuscle.com you can get motive gear with purple oil
for a good price

Here is a good chart I found to figure what RPM you'll run with different gears
www.bullittarchive.com/3013.htm
Hope it helps

Thanks for your help
I was just looking for some info on gears before I make the change... not a smart ass answer like that...Why do some people always have to post comments like this when people are looking for help or advice

Obviously had to take some time to think of a witty comment for the second post, because the first one wasn't sarcastic enough!!!

I'm voting 4.10's as well from Ford Racing. I personally don't have them, but know some guys who do, and they're not seeing huge differences in mileage.

Maybe even get a GT instead of a V6???

Not to high jack the thread but anyone have experience with the Motive 3.90 ratio?

Seeing that you have an '01 Cobra,nothing less then a 4.10 for sure.
I often wonder why 3.90's were created in the first place when gear topics come up."It's almost a 4.10,but almost a 3.73".....:banghead:
Don't get me wrong,and i'm not trying to sound like an ass.
Since i've been there like most accross north america that have had different gears with the "Modular" motor.Anything under the 4.10 is a waste.The modular engine needs gear since it is a reving motor,and makes crap for torque down low.
I can understand if someones 4.6 is equipped with a blower,or some sort of power adder,and wants 3.73's to keep traction issues to a minimum,but N/A,the 4.6 needs gear.:wink:
I will tell you this.My 4.10 equipped 4.6 GT is tamer then a 5.0 with 3.73's,what i mean is that a 5.0 with 3.73's is still torquier.
Many of us accross north american have wasted our hard earned money on 3.73's or anything lower then 4.10's,plus install,and wished we had gone to 4.10's or higher,and wished we listened to those that have "told us " LOL!
I know next year i might be planning to go 4.30's.Since my GT is cammed,with a ported Bullitt intake,she has more room for more gear.And from my research on "Modular Mustang" pecific web boards,lots of guys with full bolt on modular stangs are happy they made the jump to those babies LOL!:biggrin:

Not bad,my GT has had the 3.27,then 3.73,now 4.10's,and next year 4.30's.It's an addiction LMAO!!:confused:

I agree. If you are looking for a fluffy daily driver with great (read low) RPM's and Gas Mileage then stay with a 3:31 and don't waste your money on anything less than a 4:10.

This is my first "mod motor" (previous big block Chevelle, small block Vega, big block Mopar) so being old (and old school!) it's just hard to wrap my brain around ratios that low for street/hwy. :redface: Vega was geared 4.11 so that is what my little brain remembers:LOL: Thanks for the input, next spring will bring 4.10s I think.

I totally understand where you are coming from.With the Ford modular,you need to unlearn everything you have learned in the past to relearn the new technology today like the modular Ford small block.They both opperate in different rpms when it comes to hp,and torque. :wink:

Just last night,my buddy,and i were out cruisin',we both have 4.10's,but his is a 5.0,he was in 4th at 1500 rpm roughly doing the speed limit,and i was in 3rd at 1500 rpm beside him.
Just goes to show the difference.
And no prob's.I'm sure you will enjoy.Next year i'm bumping my GT's rear diff to 4.30's for sure. :)

here a table for best swap depending on what you want

Gear Tables

i'm using 4.10 setup on my 5.0 works fine love the torque!

32mpg? I don't think that is accurate. I have a few friends from canada and they always seem to figure out the MPG the wrong way. All of there cars are super good on gas. I have a buddy with a corolla who thinks he does 50mpg. Corollas don't get 50. I don't think your GT gets 32 either. If so, I want one of those.

Thanks
But I know how to calculate my MPG
Crusing at 100km/hr reving at 1500RMP or so with stock gears on the open road
Oh sorry, the last time I calculated it it was 31.8, not 32, so your right!

I have been keeping track of my gas data since I started driving

ALSO
Your in Maine or so your profile states
So one imperial gallon is exactly 4.54609 litres, whereas one U.S. gallon is exactly 3.7854118 liters.
You would also calculate it different