i have an 06 GT with the auto. it has the 331 gears and i want to go lower. but should i go with the 373's or the 410's. i have slp axcell back exhaust and a afe CAI. also soon to get a tuner. i haven't raced it yet but would like it to be quick around town. I also drive this car alot so i dont want to have it to wound up. thanks guys you rock......
You have the ability to answer the question of what gear ratio will work best for you. Don't simply listen to some dork that says you "need X.XX gear because they ROCK!" For all you know they are borderline brain dead. Just because they don't mind driving around with the motor spinning to the moon doesn't mean you won't.
This is the most important information you need before making your own choice based on your situation:
What RPM’s do you want to be cruising down the freeway at and at what speed. Think about that hard, and go drive the car. Drive it for 2 miles at 3,000rpm…..it will most likely drive you crazy. If it does, you want to make sure you don’t get a gear that will put you in that range. I have mine set up to run at 2400rpm’s@80mph. I wouldn’t want to spin it any higher than that even if it costs me a bit of acceleration.
Depending on what the height of your tires have I'll bet you will want 3.55's or 3.73's to get a comfortable cruising RPM.
I run a 3.55 and couldn't imagine wanting to gear my car shorter than it is. I do have a screw blower though. 1st gear is worthless, I just punch it and have to shift right away and 2nd gear will haze the tires even though I have some seriously sticky rubber. Shorter gearing wouldn't get me going any faster....faster. It could possibly even slow me down.
Even if you don't have a blower but have stock-ish tires (high performance, all season about 235-245mm wide) you will still light the tires up something good in first and have to go for second super fast which makes that gear borderline useless. You will still lightly spin the tires most of the way through second too (if you make the 1-2nd gear shift fast) which lessens the effectiveness of that gear too. Which will slow you down.
When I had my stock 3.31's and stock Pirelli tires (about 75 miles ) I could SPIN the tires all the way through 2nd gear if I wanted too.
Use this gearing calculator. It will help you pick a gear for your situation. Use the # .71 for the auto trans ratio and .68 for the 5 speed. You will also need to measure the height of your rear tire at the right pressure sitting on the ground. You can keep firing numbers in till you find the gear that gets you the cruising RPM that you are looking for.
You have the ability to answer the question of what gear ratio will work best for you. Don't simply listen to some dork that says you "need X.XX gear because they ROCK!" For all you know they are borderline brain dead. Just because they don't mind driving around with the motor spinning to the moon doesn't mean you won't.
This is the most important information you need before making your own choice based on your situation:
What RPM’s do you want to be cruising down the freeway at and at what speed. Think about that hard, and go drive the car. Drive it for 2 miles at 3,000rpm…..it will most likely drive you crazy. If it does, you want to make sure you don’t get a gear that will put you in that range. I have mine set up to run at 2400rpm’s@80mph. I wouldn’t want to spin it any higher than that even if it costs me a bit of acceleration.
Depending on what the height of your tires have I'll bet you will want 3.55's or 3.73's to get a comfortable cruising RPM.
I run a 3.55 and couldn't imagine wanting to gear my car shorter than it is. I do have a screw blower though. 1st gear is worthless, I just punch it and have to shift right away and 2nd gear will haze the tires even though I have some seriously sticky rubber. Shorter gearing wouldn't get me going any faster....faster. It could possibly even slow me down.
Even if you don't have a blower but have stock-ish tires (high performance, all season about 235-245mm wide) you will still light the tires up something good in first and have to go for second super fast which makes that gear borderline useless. You will still lightly spin the tires most of the way through second too (if you make the 1-2nd gear shift fast) which lessens the effectiveness of that gear too. Which will slow you down.
When I had my stock 3.31's and stock Pirelli tires (about 75 miles ) I could SPIN the tires all the way through 2nd gear if I wanted too.
Use this gearing calculator. It will help you pick a gear for your situation. Use the # .71 for the auto trans ratio and .68 for the 5 speed. You will also need to measure the height of your rear tire at the right pressure sitting on the ground. You can keep firing numbers in till you find the gear that gets you the cruising RPM that you are looking for.
See what I mean? Sqidd has gotten to the point where he just saves his posts and custs and pastes after having to answer this same question so many times.
If you drive alot I'd skip the gears, they are annoying and create alot more stress on the motor and trans. I think 4:10s would rock if this was your 2nd car
__________________
"Goose, Hollywood's fine, I want Viper"
1995 Mustang GT Cnv 347(427 stroker being built!) almost done!
1996 Cobra with Kenne Bell 2.1 Supercharger and every other conceivable part you can bolt on it...650hp upgrade in the works
2003 Infiniti M45 V8 340 hp...a methadone treatment for reformed Mustang drivers
Mine is at 2750 rpm with the stock 17 inch pirellis @ 80 mph. If i was on the highway alot, there is no way i would have 4.10's in it. Just put your car in the correct geat manually, drive it to that rpm and see if you can tolerate it with your current exhaust setup.
If i am not mistaken, the BULLIT comes with these stock. Without a gear change or some sort of forced induction, your car will always be a little sluggish at low rpm.
__________________
2006 Mustang GT. CDC classic chin spoiler,Off road x , FRPP GTA axlebacks,Tunable Induction CAI,SCTtuner. FRPP 3.73 gear,Rear window louver,Qtr window louvers.CDC shaker hood,M&H drag radials, and ZEX 125 shot nitrous for insurance!
Best ET to date- 11.89 @ 114 mph
390 rwhp
520 rwtq
No more Nitrous all motor now.Don't ask.
I changed to 4.10`s even though when I take my car to work its 46 miles on the highway round trip.One of my reasons was, I was driving way too fast, and this was one way to slow me down, and it did.For the rest of my driving I love them.It did knock a couple of MPG`s off,but if your worried about that you shouldn`t be doing HP mods anyway!
__________________
`06 Redfire GT Premium Coupe,398 Stroker,Whipple Supercharged,Comp Cams, Ford Racing CNC ported heads & throttle body,JBA longtubes,4:10`s with Eaton posi,Moser 31 spline axles,5R55S auto trans w/billet 3500 stall converter by Level Ten, TCI ratchet shifter,BMR K member ,A arms,trailing arms & drive shaft loop,aluminum drive shaft, ,BFG KDWS`s on Am Racing,CDC chin spoiler,Roush rear wing,custom roll bar by JW Racing & fabrication Shelton Conn, engine & tuning by Jannetty Racing Waterbury Conn.
A gear table (as in Squidds post) is the most accurate way to gather data to make a decision on what ratio is right for your driving. A more quick and dirty way is to ask youself "how much of the time do I dirve in 5th gear?" My driving is exclusively aroung town, and originally I almost never got into 5th gear. The 4.10 is ideal for me since I now get to use 5th gear occasionally. The lower gears give me more acceleration. And, because I now can use 5th, my mpg did not change.
What is your driving situation. Identifiy it. Then determine which gear ratio is right for you.
__________________
'06 GT, manual, Satin Silver, lt. grey cloth int., IUP.
MODIFICATIONS - Goodyear F1 GS-D3s; 245/45 on 18x9, 275/40 on 18x10| Progress Technology springs & sway bars| Steeda adj. panhard bar, panhard brace, front control arm brace & bushings| strut tower brace| Tokico D-Spec dampers| CHE adj. LCAs & BMR relocation brackets |drilled & slotted front rotors| C&L intake| BamaChips SCT tune| FRPP 4.10 ring & pinion| Pypes off road H-pipes| FRPP GTA mufflers.
I've been using 4:10's for about 2 years and I like the extra "punch" you get from the lower gears. My former GF lived 80 highway miles from, me and the regular commute hasn't harmed anything, except milage.
what gears for 06 auto gt 
all motor now.Don't ask.
, and this was one way to slow me down, and it did.For the rest of my driving I love them
