I'm beefing up the drivetrain on my GTO and I figured since I'm in there I should change up the gears in the rear end. Right now the car has an f1a and running a 26" tall Hoosier tire. I'm not having any traction issues coming out of the hole so I was curious if gears would help. I've read a lot of threads and can't make a solid decision on which ratio I should go with. 3.90's or 3.70's, or just stick with stock gears since I'm procharged. Any insight would help. Thank you in advance.
Been wondering about this as well, I have a p1 and a manual so nowhere near the boost or power of the op. Last time in the 1/4, I was crossing the traps at 5100-5200 and trapping 117. Seems that a 3.70 or 3.90 would be more beneficial since the boost increases as the rpm's go up. Any other procharged guys running a 3.70 or 3.90 with a manual transmission? The car feels so good in the 1/8 but after the 3/4 shift it feels pretty slow.
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