Gears for a 2003 GT

[dmdesilva]

Hey everybody,

I am looking to get a set of gears for my 2003 5-speed GT. I mainly use the car for AutoX and have extensive work done to the suspension (MM Maximim Grip Box) and a tri-ax short throw shifter. I am looking for advice on which set up to choose. I have a friend who suggested 4.10's but I have heard from others that they might not be the best choice. I am also kicking around 3.73's. I defer to the group on this because I am still learning.

Any help is greatly appreciated!

Thanks.

 

[Dark_Horse]

Go 4.10s and don't look back

 

[trinity_gt]

If you use the car primarily for auto-cross then I'd think point-and-shoot acceleration out of the corners is more important to you than highway cruising RPM. I'd suggest 4.10s or 4.30s and consider a differential upgrade to provide more torque bias to help prevent one wheel peels in tight corners.

 

[vertigasen]

If you use the car primarily for auto-cross then I'd think point-and-shoot acceleration out of the corners is more important to you than highway cruising RPM. I'd suggest 4.10s or 4.30s and consider a differential upgrade to provide more torque bias to help prevent one wheel peels in tight corners.

I agree ith this ^^. One thing I would say, use a gear calculator, like this. It will allow you to see what speed you will hit in what gears. Here is an example @ 6000 rpms in 3rd gear with a TR-3650 and 295/35-18 tires.

4.30 = 82.17 mph
4.10 = 86.18 mph
3.73 = 94.73 mph

I know a guy that does a lot of AX. This is how he chose his gears. He went with 3.73s because he was hitting upper 80-low 90s (sc car) in one of the straights. He started with 4.10s and switched to the 3.73s so he would not have to shift. While he lost a little coming out of the corners, he picked up more not having to shift to 4th, then right back down.

 

[sneaky98gt]

I, too, would probably lean toward the 4.10s based on the increased torque multiplication down low. The only disadvantage I see is that they may require more shifts around an Auto-X track. While that is small, it could easily affect times if those shifts are at critical points in a curve, for example.