Gears... 4:10 or 4:30

crdshrp · 12-30-2004

I will be racing my stang at the strip and will be doing street/highway driving as well.

What is the better route to go? 4:10 gears or 4:30's? This will be for an automatic.

loudog · 12-30-2004

You'll be buzzing too many RPMs at freeway speed with 4:30s...stick with 3:89s or 4:11s max. Just my opinion.

crdshrp · 01-02-2005

Quote:

Originally Posted by loudog

You'll be buzzing too many RPMs at freeway speed with 4:30s...stick with 3:89s or 4:11s max. Just my opinion.

what is the top speed with 4:11's?

crdshrp · 01-05-2005

anyone know?

also does this gear change affect the spedometer..please let me know..thanks

Lances03GT · 01-05-2005

It will effect the speedometer alot, you will need to get a speedcal or a flash tuner.

loudog · 01-05-2005

The RPM change is dependant on your tire diameter, too....smaller diameter tires is equivalent to lower gears.

I thought I saw a website once where you could enter the rearend gear ratio, transmission final drive ratio, and tire diameter to give you the RPM at any particular speed.

I can tell you from experience that with my Top Loader 4-speed (a 1:1 final drive ratio) with a 4.11 rearend, and small tires (15" wheels with 245-60-15 tires) I was buzzing about 4,000 RPM going about 75MPH in 4th gear. Top end sucked - but boy did it pull hard through the gears!

crdshrp · 01-06-2005

So what would the top speed be on a Stock mustang GT with 4:10 or 4:11 gears?