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Old 12-16-2016, 05:42 PM   #1
Professorchaos
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Question Rear gear selection for procharged GTO

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.
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Old 12-16-2016, 05:50 PM   #2
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I would run as much gear as you can as long as you can maintain traction.
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Old 12-17-2016, 12:08 PM   #3
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Stick with stock since with that F1A you will be trapping 135-140MPH which is top of 4th with a 7000RPM limiter. May even have to go with a 28" tire depending on HP and where your limiter is set.
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Old 12-17-2016, 05:31 PM   #4
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Can we fit a 28" tall tire without mini tub?
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Old 12-17-2016, 05:46 PM   #5
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Stick with what's working. Prochargers tend to blow off the tires at the top end, and going up on the gears would only make that worse. If it ain't broke, don't fix it.
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Old 12-18-2016, 04:00 AM   #6
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Quote:
Originally Posted by Professorchaos...View Post
Can we fit a 28" tall tire without mini tub?

Yes, but you need to be mindful of gaps, may require different wheel offsets or spacers.
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Old 12-18-2016, 07:36 AM   #7
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Put the tallest tire you can fit.

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Old 12-18-2016, 10:36 AM   #8
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Ok, sounds like I'll just stick with stock gearing since it is working with the 26 slicks. I've been really trying to work on my 60' and my final ET's. Any other recommendations? Thank you.
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Old 01-08-2017, 06:20 PM   #9
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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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