well according to everyone else, by changing your rear end gear to a higher one, you will be faster in the 1/4 mile. this one guy in a shop by me told me that a 3.73 and a posi will take around .5 off my ET compared to my open 3.23's ......well according to http://www.newcovenant.com/firebird/performance.htm it wont do a damn thing...not even a 4.10 will help according to him!! is he stupid, or an i getting wrong information everywhere i look??

 

It depends on alot of things.

Higher gear ratio makes your engine turn faster at any given mph. So, if you put too much gear in a car where the engine can't produce any power once it revs up, you get one of those deals where the car will go from 0-60 in 3 seconds, but then it takes 5 minutes to get up to 65. A car like that will go faster in the 1320 with less gear.

Most cars with a relatively stock motor like yours will go fastest with about 3.42 or 3.73 gears.

The best cheapest quickest way to find out what gears to use is to take your car to the chassis dyno. Find its peak torque RPM and its peak HP rpm. Then gear the car such that according to one of those RPM vs. ET calculators, you shift and go through the traps at just above the peak HP RPM. Ideally you would run a converter to launch just below your peak torque RPM if it's an autot trans, and after each shift, you want to be right back at peak torque.