retfr8flyr

Converter stall speed is kind of like a supercharger, you don’t really notice it unless you get on it. A 3000 stall converter will drive almost like stock, it will be a little looser but hardly noticeable with normal part throttle driving. When you stomp the throttle it will flash to 3000 or more RPM and you will launch as if you had a manual and dumped the clutch at 3000. A high stall converter is one of the absolute best performance mods you can do for an automatic.

Earl

ZZmustang

I have 410s in my 06 auto and with 2 overdrives it's no big deal. Sure is a difference in the seat of the pants though. 410s and a 93 octane program is great.

Newbreedgt05

So, will you lose some mpg. Is this just going to be with highway driving or altogether?

jbailer

So for the most part those are still subjective questions and the answers will vary based on personal preference with the exception of when will you out gear the car in the 1/4 mile. That is dependent on the overall gear ratio, weight, power and drag. Trust me, with 287rwhp, you will be nowhere near out gearing the car. I have the formula around somewhere but I'm running 4.10s above 450rwhp and haven't out geared the car.

If it was me trying to answer your question, I would say 4.30s. It sounds like you are very concerned about performance. The lower the gearing (higher numbers) will yield more torque and get you off the line quicker. You said mileage doesn't matter so I throw that one out of the equation. As far as bad weather, of course a car that has more torque/hp will spin easier off the line. As mentioned already, the answer is to go easier on the gas.

Here is a link to a site with many calculators. Backup 1 level for others but this is a calculator to help figure out gearing. http://www.wallaceracing.com/calcrgr.phpIf you plug in 6200 RPMs with 27" tires and figuring you won't be over 115MPH for sure, 4.30s will not run out. Using the ET calculator, using a weight of 3700lbs (car+driver = may be different) and 300rwhp an expected ET of 13.6 at 98mph. Plugging 98mph in as a max would allow you to run up to 5.08:1 gears before you hit a redline of 6200rpm in the 1/4 mile. -Joe

Quick S

Thanks jbailerfor the tech info, I also have been using Motive gears chart as well. http://www.motivegear.com/pages/charts/charts.htm. For now I'm going to hold off on gears anyway until, I get a few more mods done. I fiqure the best direction to go is finish up with all the modsI want to do, then throw gears and a TQ converter in last.

2k05gt

+ 1

TheShelby HertzGTH is an Auto and comes with 3.55
If you are going to Turbo or Supercharge 3.73 - 3.90 MAX
NA 4.10 all the Way, It will wake up the Auto GT and add almost 6 or 7/10ths in the 1/2
I have BFG GForce TA 275/40 ZR18 and run about 21 MPG Average and 3000RPM at 80 MPH
Acceptable losses but HUGE Gains. Top end not affected much (see Image)

[IMG]local://upfiles/25187/0E58EF7CA97542D58709AFF276237C62.jpg[/IMG]
And I still had more room to go RPM Wse,but I was running out of road.

mustangman02232

NA
auto 4.10
5 speed 4.30

centri blower/ nitrous
auto 4.10
5 speed 4.10

twin screw/turbo
dont know no expereince with them

you will loose 2 mpg by going from 3.31s to 4.10 for the unmillionth time