Gear Question

[Bluebullit]

So im thinking about building up my rear end in the near future and im trying to see if i should run 3.73 or 3.90

i have a stock 3605 tranny in my 01 GT and i have a Vortech with all the works so what would be the better gear cause i do a good bit of daily driving if the weather is nice so i still need gas mileage but i want to free the car up at the track also

Thanks guys

 

[spike_africa]

Sounds like you don't want a lot of gear so you kinda answered your own question, get the 3.73's.

 

[sleepermobile]

So im thinking about building up my rear end in the near future and im trying to see if i should run 3.73 or 3.90

i have a stock 3605 tranny in my 01 GT and i have a Vortech with all the works so what would be the better gear cause i do a good bit of daily driving if the weather is nice so i still need gas mileage but i want to free the car up at the track also

Thanks guys

I have been fighting this question in my mind for months. I have researched it a lot, asked this same question here a few times. Sounds like we have very similar cars, accept for trans. I have had a few guys here say 4 30s are best even with a s/c cars. Every thing I have found out says 3 90s are perfect. Im still gonna be hard headed and go 4 10s though:bash: I have also had 3 73s installed in a camaro, wasnt even impressed. Switched again to 3 91s and what a difference that little bit made, the car came alive.

 

[97desertCobra]

From what I recall Ford doesn't make 3.90 gears. I know other companies do but when it comes to gears I will only get Ford. So 3.73.

 

[Bluebullit]

From what I recall Ford doesn't make 3.90 gears. I know other companies do but when it comes to gears I will only get Ford. So 3.73.

Motive Performance Plus 3.90 Gears at AmericanMuscle.com - Free Shipping!

yep they sure do and i rode in a buddies cobra that had a F1-a and 4.10 in the rear and it felt fast but he was shifting all the time and in the 1/4 he had to go into 5th gear so it killed his time. im thinking 3.90's are going to be the perfect median but i still have some time to think about it

 

[sleepermobile]

Motive Performance Plus 3.90 Gears at AmericanMuscle.com - Free Shipping!

yep they sure do and i rode in a buddies cobra that had a F1-a and 4.10 in the rear and it felt fast but he was shifting all the time and in the 1/4 he had to go into 5th gear so it killed his time. im thinking 3.90's are going to be the perfect median but i still have some time to think about it

I have done a great deal of research on this. I have found MANY s/c cars with 500+ rwhp, are running 3 55s - 3 90s. Im going with their experiences but sure want 4 10s:fm:

 

[Bluebullit]

I have done a great deal of research on this. I have found MANY s/c cars with 500+ rwhp, are running 3 55s - 3 90s. Im going with their experiences but sure want 4 10s:fm:

i dont want 4.10's thats the deal, maybe if i was N/A cam instead of have a S/C but since i do have a blower i have made the decision between the 2 cause going from 3.27 to 3.55 seems like a waist of money and the 3.73 might be the gear for me since i still like to do a highway roll every now and then but the 3.90 would make for a better track car too. i need to talk to someone that has 3.90 and see what they say about the highway side of the issue

 

[Cookieman00x]

I did a 3.55 and am very happy with them..

 

[brian98svtsnake]

i went from 4.10's to 3.73's because i was afraid my engine would blow in fourth gear at the track. The 3.73's are nice with a blower and very streetable. Brought my rpm's down about 300 or so rpm's and i'm much more comfortable at the track now.

 

[scotts99snake]

Not that it helps any but I have a 4.30 rear gear coupled with my p1. I don't regret it. It gets me into my useable rpms and keeps me there.

 

[Bluebullit]

yeah i mean my tranny is about to tank i think so im either gonna get a T-56 or an auto and if get an auto i think i might get the 4.30 but for a standard that is to much gear for me personally.

 

[spxxdy86]

Blackmach1 on here has 3.73 in his F1A procharged 5 speed, i believe he had 4.10's but ran out gear at the track or sumthing! Im doin 3.90's with my T-56

 

[stangnutlx]

everyones afraid of 4.10's. bla bla bla. Its the only gear that will ever see my cars. I tach 3000 at 80 and the car moves out when i need it. Im going to run my s trim with 4.10's. vortech says ill need to invest in some sticky tires cause im going to roast the crap out of them. Dont fear the gear!!!

 

[wtsn8ke]

I went from 3.73 to 4.10 with my procharger. Now i wish i had stuck with the 3.73's. 4.10's are just annoying on the freeway.

 

[Bluebullit]

I went from 3.73 to 4.10 with my procharger. Now i wish i had stuck with the 3.73's. 4.10's are just annoying on the freeway.

that is what im worried about

 

[19COBRA93]

When my car had the ported Eaton on it I ran 3.73's, 4.10's, and 4.30's. It also has stage III ported heads, so the power band was up higher in the RPM. I personally liked the 4.30's the most. I even ran nitrous with that setup. My best quarter time was with the 4.30's. I went through at 11.08@125 (7300 rpm).

If you don't run at the track with stlicks that often, then I'd suggest the 3.73's with the 5 speed. If you're going to install a cobra 6 speed then I'd suggest the 4.10's because of the crappy tall 1st gear in the 6 speed.

Deeper gears (4.10's 4.30's) are easier on clutches and transmissions, but harder on rearends. Taller gears (3.27's 3.55's) are harder on clutches and transmissions but easier on rearends.

 

[Evil Bender]

I put 3.90s in my Cobra and wish it was 4.10s, much better in city traffic and they help to make up for the low compression in this heavy car.

 

[Bluebullit]

thanks guys i think ill hold off on the gears till i get the tranny situation figured out but you all have game me some great ideas and i really appreciated

 

[97desertCobra]

Oh btw I have 3.73's. Love them with the blower. Its enough to get into the powerband and not too much gear to take away from a high speed run. And I have a t-56.

 

[Bluebullit]

yeah that is what im looking for since all i mainly do is drive it around, i rarely run it at the track but that is mainly because i dont have track tires anymore and im scared the rearend is gonna crap on me lol