I have 4.57s now and they were great with my supercharger at 310rwhp but with by new turbo I am well over 400 and get a lot of wheel spin. Even with 18in 265/35s.

A GTA dragracer is suggesting I go with something around 3.70s.

Any ideas and does anybody make anything lower than 4.10s.

 

Go back to a stock rearend and get fatter rubber or stop driving so fast.

 

The only two ratios I have found on the internet are 3.909 not currently available and 3.636 that are very hard to find.

http://members.aol.com/solomiata/Drivetrain.html

 

Moving to FI.

 

4.10's should be fine... but I'd consider getting some street legal drag radials.

 

What kind of 265/35s are you running? With some sticky tires and 4.10's, you should be fine.

Also, what suspension do you have?

 

I have the 4.57s but with only 325whp turbo set up and I am fine with 255 Michelin Pilot Sport 2.
To be honest, I would love to go back to stock, because I don't feel the need to have them any more, also auto-x is better on 4.1s since you can drive in 1st the whole time, but the fact that the 4.57s are 30% stronger than stock gives me a good sleep at night.