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what gears?

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Old Dec 28, 2010 | 04:27 PM
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VandykeT/A's Avatar
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Default what gears?

I'm about to order a 9 inch rear for my Trans Am. I'll be running a MS4, PRC 215s, and eventually a FAST intake just not at the moment. Its a 6 speed with 275 40 17s up front and 315 35s out back. It'll see the track occasionally and its a weekend cruiser. I don't have any plans on spraying it so do you guys think i should stick with 4.10s or go to something else. thanks
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Old Dec 29, 2010 | 08:12 PM
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I have 3.70s in my car. Biggest thing I notice moving from the 3.42s was with 6th gear.
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Old Dec 30, 2010 | 12:10 AM
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Originally Posted by _JB_
I have 3.70s in my car. Biggest thing I notice moving from the 3.42s was with 6th gear.
How does your car do on the highway around 70-75 mph? Did you see a big drop in MPG compared to before?
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Old Dec 30, 2010 | 12:47 AM
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If you don't plan on spraying I'd go with 4.30's. If you ever plan on spraying I'd stick with the 4.11's.

If you don't have them already you'll def want to run some DR's.
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Old Dec 30, 2010 | 02:05 AM
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Originally Posted by Grimes
How does your car do on the highway around 70-75 mph? Did you see a big drop in MPG compared to before?
Does fine. The gears seemed to wake the car up a little, and I'm sure it would continue the same with the other gears. I went from an average of 27MPG to 25MPG on the highway, but that also included more than the gear change.
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