I was thinking of getting gears for the Borg Warnner rear, which ratio would be best and how will it effect my times? I am currently running 2.77 gears in the 9-bolt now. It is an '89 IROC 350ci TPI automatic with 62K miles on it. It has the following mods: SLP 1 3/4 headers, no cat, Hooker catback, ported plenum, gutted MAF, gutted airbox, no smog equipment, AFPR set at 47psi, MSD coil, Taylor wires, ARAP custom PROM, 180 degree stat, cool fan turn on settings, TB bypass, and K&N filters. In the future I WANT to get an Edelbrock intake and port a set of SLP runners to help the top end.
I just went to the track last Friday the 13th and ran a 14.0 at 98.87MPH with a 2.16 60ft time. The track is at about 700ft above sea level and the time is NOT corrected, the weather was nice but a little too humid. I was running on Eagle GS-C street tires. The trans was also shifting a little too high, 5500RPMs. How would a set of 3.45 or 3.70 gears affect my times?