Gears for Daily driver 04 GT????

CrimsonStang · Jun 16, 2011

ArkansasHog said it all- I highly recommend 4.10's. I have no issues on the highway, 3,000 RPMs at 90 MPH.

SteedaGT9150 · Jun 17, 2011

CrimsonStang said:
ArkansasHog said it all- I highly recommend 4.10's. I have know issues on the highway, 3,000 RPMs at 90 MPH.

More like 3k rpm's at 80 mph.... and that sucks for on the highway

bigkeeko · Jun 17, 2011

Guy joined the forum, started a guaranteed dispute thread and disappeared. Class.

sneaky98gt · Jun 17, 2011

bigkeeko said:
Not a thread hijack but what you guys make of this?
My FR 4.10s are run in. Nice dry day. Took the car out for a WOT run and hard launch. I`m not the hard launch kinda dude but I thought I`d try it anyway as I`d never tried it.
Car is a 2003 GT Auto. Diablo 93 tune, Accufab plenum TB, K&N, catback etc. You get the picture. BEFORE the 4.10s went , on stock 17s and 3.27s the car could spin a tyre, no problem and chirp 1st/2nd easily.
Now after the gears I`ve added 18s with Michelin Pilots 295/35/18s.

Same launch. OD off and Traction control off. No spinning. 1st gear felt longer than I thought it would. Into 2nd there was a bit of slip then on to 3rd. Absolutely fuss free. I wasn`t expecting that.

Whats the deal? Was I expecting too much from the gears? It either feels like I`m down on power or I have plenty traction. I mean the car certainly tramps to 3 figures in no time and it drives fine so it can`t be power thing surely. It just doesn`t feel as `frantic` as I thought. I watched a couple of 4.10 videos on youtube and they seemed more `fun`.
I`m actually thinking now I can go down the blower route even with the 4.10s. Any thoughts gear heads?

I think it's because of the automatic. The auto tranny doesn't allow quite as big of a 'shock' to the tires, and that helps retain better traction. Plus, our 1st gear is 2.84:1 while the 5 speed guys' 1st gear is 3.38:1. That's a 20% increase in torque to the wheels JUST from the transmission gear ratios. To put that in perspective, that is the same percentage increase in going to 4.10s from 3.27s. So if you were to take 2 identical Mustangs, one automatic and one 5-speed, the 5-speeds 1st gear would put the same torque to wheels with stock 3.27 rear gears than the automatic's 1st gear would with 4.10s.

That being said, I know exactly what you mean. I hear this talk all the time of mostly stock Mustangs laying down rubber 1st and 2nd gear; all the while I'm making 330 ft-lbs of torque at 2000 rpm with a positive displacement blower, and I have no such occurrences. Oh well, 80 more horsepower and 3.73s should fix that problem.

Dark04GT said:
You can add gears and they keep you in a nice powerband perfect for a 1/4 mile type environment but gears don't add hp; they help a good driver stay in the right place in the powerband and with practice could potentially help the ET in the 1/4 mile.

This is SO true. Gears don't help that much if you are already in your powerband. They really help when your powerband is shifted up enough that it takes a significant amount of time to get to that powerband. And that's still ignoring the traction issues that almost anyone would have on street tires.

bigkeeko · Jun 17, 2011

sneaky98gt said:
I think it's because of the automatic. The auto tranny doesn't allow quite as big of a 'shock' to the tires, and that helps retain better traction. Plus, our 1st gear is 2.84:1 while the 5 speed guys' 1st gear is 3.38:1

That being said, I know exactly what you mean. I hear this talk all the time of mostly stock Mustangs laying down rubber 1st and 2nd gear; all the while I'm making 330 ft-lbs of torque at 2000 rpm with a positive displacement blower

Fair point mate. I thought I would add that I took my Diablosport Predator Tuner round last night to my garage and totally reworked the Gearbox settings.
Theres Torque Modulation adjustment when you go to modify the tune and I gave it more bite.
I had already changed the `shift firmness` but the Torque modulation has definatly improved things. 1st to 2nd ever so slight spin. 2nd to 3rd chirp.

I love it

CrimsonStang · Jun 17, 2011

SteedaGT9150 said:
More like 3k rpm's at 80 mph.... and that sucks for on the highway

No, 90 MPH and my speedo is calibrated. Should be 2,661 at 80 MPH, but whatever. Speed limit by me is 55 and I usually don't exceed 70 in the Stang. Type of exhaust definitely factors into highway drivability.

sneaky98gt · Jun 18, 2011

CrimsonStang said:
No, 90 MPH and my speedo is calibrated. Should be 2,661 at 80 MPH, but whatever. Speed limit by me is 55 and I usually don't exceed 70 in the Stang. Type of exhaust definitely factors into highway drivability.

It depends on the OD ratio in your transmission. Most of the earlier 5 speeds came with a .68:1 OD ratio, which it is almost 3000 rpm at 80. Some of the later transmissions had a .62:1 OD ratio (like I suspect yours has) with which your 2660 rpm at 80 is correct.

Night Shifter · Jun 18, 2011

i dd my car right now with 3.73s...i drive 50 miles a day..mostly higway though...i do putt around town every no and then in the car...honestly, i shoulda went with 4.10s... but id say stick with 3.73s... youll be happy with them unless you put cams in later down the road... just my .02

1low03gt · Jun 18, 2011

I had 3.73's(....now 4.10's for the last 3 years),and to tell you the truth,i could not notice the difference compared to the stock 3.27,probably cause it's not a huge jump in gears unlike the 5.0L cars where they were equipped with 2.73's(3.08 as an option),so going from that shallow of a gear to 3.73's is a huge jump.For the kick in the pants,in my opinion,the 4.6 needs 4.10's minimum.......unless a blower is in the future.

RedFord96 · Jun 18, 2011

Now I'm curious... what kind of MPGs are y'all pulling in with 4:10s around town? Highway? Or do you guys even care about getting somewhat decent mileage in your Mustangs? (mainly a question for those of you who also DD your Mustang)

Not trying to flame anyone, but an honest question since this thread is on that topic already. I have 3:55s sitting in a box in my garage but am not sure I'm wanting to have to pay more at the pump just for more seat-of-the-pants feel since I'm on the highway a decent amount and I do like getting over 25mpg.

txredgt · Jun 18, 2011

RedFord96 said:
Now I'm curious... what kind of MPGs are y'all pulling in with 4:10s around town? Highway? Or do you guys even care about getting somewhat decent mileage in your Mustangs? (mainly a question for those of you who also DD your Mustang)

Not trying to flame anyone, but an honest question since this thread is on that topic already. I have 3:55s sitting in a box in my garage but am not sure I'm wanting to have to pay more at the pump just for more seat-of-the-pants feel since I'm on the highway a decent amount and I do like getting over 25mpg.

3:55 and 3:73 are the best choice for SC/Turbo cars it seems. Some even like the stock 3.27's as well.

For a NA car I wouldn't go lower than 3.73's.

I can only tell you what I am getting with 3.73's and those #'s are roughly;

200-230 miles per tank so low end is around 15 mpg, but that is driving in traffic and having to use the gas petal to keep people off my bumper. I try to save the dino's but it doesn't usually work out.

Now on the highway (and this was not even on an interstate, just a long distance trip with an easy 10 slow downs from 70 and I got 280 miles on 1 tank. Translates to 20 mpg. I think if you cruise 70 the whole time you can get close to 25 mpg no problem. I had to change speeds frequently due to being on backroads.

mransr · Jun 18, 2011

I find it hard to believe people can't feel the difference between the stock gears and 3.73...for me it was like night and day

Gears for Daily driver 04 GT????

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