3.73 or 4.10

sam adams · Feb 15, 2009

I am trying to decide on which gear set to get. I have gone through most of the forum and there isnt much talk about 5 speeds with gear questions. I have an 08 GT with pypes x pipe, magnaflow magnapacks and bbk CAI. This is my daily driver. About half city and half highway miles. What gears would you guys recommend for my application?

NastyStang113 · Feb 15, 2009

Are you going to go with forced induction later?

klaw · Feb 15, 2009

4.10 if you're staying NA, 3.73's if you're ever going forced induction.

NotQuik · Feb 16, 2009

as mentioned above...to give you an idea with 3.31's at 70 mph I was at 1800 rpms and now I'm at 2200 with the newly installed 4.10's last friday. Not that ibg of a jump IMO but if you go with a power adder it may be a bit much gear as far as traction goes or possibly running out of gear on teh big end. Also you could always go with a taller tire to help compensate for the high gear ratio as well.

Five Oh Brian · Feb 16, 2009

4.10's are the #1 choice for 2005+ GT's that stay naturally aspirated.

3.73's are a great with most superchargers as blowers already makes so much power that you don't really need the extra torque multiplication provided by steeper gears.

I have 4.10's with my supercharger and it rips through the gears a bit too quickly. Luckily I have an automatic, so I can leave it in drive at the dragstrip and let the computer deal with the lightning fast shifts.

sam adams · Feb 16, 2009

I plan on staying NA so i guess i'll go with 4.10's. A blower isn't in the plans for a few years into the future after my kid is a little older. eventually i'll get some forced induction. thanx for the advice

sam adams · Feb 16, 2009

What do you think about 3.90. Is motive the only one who makes em'?

NastyStang113 · Feb 16, 2009

Richmond also makes 3.90s from what I've been told. I don't know about any results though.

sam adams · Feb 16, 2009

I'm gettin em installed at excessive motorsports in northern VA. I've heard good thing about them. Anyone had any experience with them? Should I throw on a throttle body too or is the stock one good enough ?

Five Oh Brian · Feb 16, 2009

sam adams said:
I'm gettin em installed at excessive motorsports in northern VA. I've heard good thing about them. Anyone had any experience with them? Should I throw on a throttle body too or is the stock one good enough ?

The stock throttle body can flow more than enough for most bolt on mods you might consider. With forced induction and/or ported heads with big cams, you might need a little more flow than the stock TB can provide, but you should be good for quite awhile with the stock TB.

xxrequiemxx · Feb 18, 2009

I'd stay with FRPP gears...

dro · Feb 18, 2009

NastyStang113 · Feb 19, 2009

xxrequiemxx said:
I'd stay with FRPP gears...

That makes two of us. I've had good luck with Precision and Yukon, too.

wusthof · Feb 20, 2009

I've heard thru the local stang groups that the 3.90 ratio are noisy - no matter how you set em' up. 4.10's for me depending on the sgt.Maj.

speed1972 · Feb 20, 2009

Personally, I haven't seen anything real positive on here when people go to the steeper gears. For the cost and wear and tear, its gained them what, maybe 2 tenths? Have any of you been to the track before and after with this change only? I didn't think it was worth it after I looked into it.
just my .02
LB

autumn_again · Feb 20, 2009

speed1972 said:
Personally, I haven't seen anything real positive on here when people go to the steeper gears. For the cost and wear and tear, its gained them what, maybe 2 tenths? Have any of you been to the track before and after with this change only? I didn't think it was worth it after I looked into it.
just my .02
LB

depending on the set up with good traction i've seen as much as a half second off with a gear change.

from the 3.08s that i had in my last stang to the 3.73s that i put in it it really woke it up.

+ for the 300 or so it is for the gears + install kit if you can do it yourself, i forget its been a while since i looked may be more. but for the money you can't beat the gains you get..

i can't think of anything thats that price that gives you the same gains.

i haven't driven a stock s197 at the track but with the 3.55s i think they stay in 3rd till the end of the 1/4. with 3.73s it is probably enough to have to shift into 4th, and 4.10s i think i'm right in the middle of 4th. i wanna go with 4.56s if i build up my rear.

Sparty92 · Feb 20, 2009

With my lame first day at the track, I was in 3rd through the lights...maybe around 6K.

No, I won't tell you my times.....there was a huge headwind all day long. It sucked.

cowtown · Feb 22, 2009

I went with 3.73's in my 06 Auto and am pretty pleased with them, in fact glad I didn't go 4.10's, I think it would have just been too much gear.

As it is I find it just enough to improve the scoot in the middle of the power band and obviously off the line and on the highway it's not cycling too high. I do find though that driving around in town is a little more awkward, if only because with a 93 Brenspeed tune and these gears (among my other mods) the car is rather frisky and in slow traffic it's a little bit of a PITA because it likes to (and wants to) move when you tip into the throttle.

I have no immediate plans for it but I had some long long term vision that I could end up with a blower at some point so that too lent me to not go any higher than 3.73's.

All that being said, if I was able to get 3.55's from the factory I don't think I would have done any gear upgrade at all.

Edit - As mentioned above another reason I went with 3.73's was also to help get the car to the end of the 1/4 a little further into 4th. I was always pleased with my ET in general as I modded my car but it always shifted into 4th just short of the line and the car always lost a bit of momentum. So hopefully when I make it back this will help my 60' improve a little and keep me in a better bit of the powerband as I cross the 1/4.

mswift5 · Feb 24, 2009

I went with 4:10's. Mine is a daily driver 5 speed with a supercharger. You won't be disappointed. If i had to go back i would have done 4:10's first before any other mod. It really wakes the car up. I had a hard time between the two gears also but everyone i talked to said you would not feel that much of a difference between the 3:55's i had and the 3:73's, that's why i went with 4:10's and glad i did.

traded5.0 · Feb 26, 2009

I just got some 4.10s' put in and I think I could have went with a 4.30. Not a huge difference than my 3.55s. I drive mostly freeway miles. About 20 miles to work. I would just have to drive a little slower on the freeway. I was crusing at between 80-90 with the 3.55s. Now between 75-80. I think thats probably fast enough. I never really look at the speedo on the freeway. I just speed up until the RPM sounds right. Now I'm just going a little slower. I think (I could be wrong), stoplight to stoplight, 4.30s would be perfect and if I did it again I would have got 4.30s since light to light is what I care most about anyways. My 5.0 was brutal with 4.10s with a TCI streetfighter auto trans. Scratched going into 3rd. Bottom line,, I barely feel the difference between the 3.55s and the 4.10s. I just go through 1st gear REALLY fast...

3.73 or 4.10

sam adams

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