bought to finish up my 9" build an cant figure out what gears to go with. what do you guys think i should go with 4.10/4.11 or 4.30/4.33 gears? the car is a t56 6 speed car with a 26" tire. right now with the stock rear and 3.42 gears it ran a best of 12.1@115.85 with a 2.02 60ft crossing the finish line at the top of 3rd very bottom of 4th gear basically shifting as i go through the traps or right before the traps. i know for the best results i should be going through the traps at the top of 4th gear. so which gear would be best for my car??

 

I'd say use the Fbody gear calculator, but I cant find one that works. I would say the 4.30's would work good for you. I've got 4.11's in my A4 car.

-Dustin-

 

I would think with the short 26" tires the 4.11's would work.

You might find some info here.
http://www.wallaceracing.com/Calculators.htm

This is the one:
http://www.wallaceracing.com/calcrgr.php

 

that is probably the easiest gear calculator iv ever seen. so anyone else got an opion on this matter?

 

At what rpm does your peak HP occur and what rpm is you rev limiter set for?
For maximum performance you should go thru the traps a few hundred rpms above your peak hp.

 

http://f-body.org/gears/

 

how high do you spin the motor? 4.30's may be a bit much but you can always running a 28 inch tire. The 4.11's may be the way to go, but that will depend on several variables.

 

peak horse power is at 6500-6600rpms but the only thing is im still on stock bottom end so im high rpm limited.

 

the rev limiter was removed an i shift it right at about 6500 to 6600 rpms.

 

According to that calc. 4.30s with 26'' tire will net 119mph at 6600rpm.

Is your measured tire height actually 26''? If they are shorter then 4.11s would be right.
Do you plan on future mods that might make your car quicker? Then 4.11s would be the better choice.