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Old 07-14-2015, 01:30 PM   #1
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Gear ratio change

I am thinking about changing the gear ratio in my GT. It has the 3.73 gear from the factory (track pack). I do almost all of my driving on the highway, and not really interested in red light to red light stuff. Don't get me wrong, I still love hammering the throttle. Around town, if I'm on level ground I don't even need 1st gear, as the engine redlines so easily. So I'm looking for a ratio that will lower the highway RPMs about 300-400. That will make 1st gear more usable, and should give better fuel economy too. I know it won't change the top end speed, as that's controlled by the computer. It should also match up well with another mod I plan down the road. I'll be adding an aluminum driveshaft at some point. Losing that 20lbs from the drive shaft should make up most, if not all of the gear ratio loss in drivability. What ratio do you think would accomplish that? Maybe a 3.55 or a 3.31??
What do you all recommend for a driveshaft supplier? Is Shaftmasters any good?
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Old 07-14-2015, 03:32 PM   #2
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Stock wheels and tires or aftermarket?


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Old 07-14-2015, 03:43 PM   #3
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A lot of guys like the 3.31's with the manuals.
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Old 07-14-2015, 03:50 PM   #4
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Im running 3.55 gears with an auto and like em. Pulls good and great gas mileage too. I am running 28.13 inch tires though.
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Old 07-14-2015, 04:32 PM   #5
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3.31 on 28" tires is a no no unless u have like 500+whp. You can keep the 3.73 and run 28" tires to effectively reduce the 3.73 to like 3.55-3.65


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Old 07-14-2015, 04:33 PM   #6
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Yes, tires/wheels are the stock size. I have replaced the P Zeros with Michelin Pilot Super Sports.
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Old 07-14-2015, 04:54 PM   #7
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3.31 are great for stock and aftermarket tune. I ran my fastest in stock tires and a 93 tune with intake and exhaust as the only other mod besides sportline springs.

Get bigger tires and you'll need to look into at least a 3.55 if not 3.73 else you'll have too tall and heavy a wheel/tire combo to turn it fast.

Going from a 3.31 and a 27.1" 285/35/20 set up (0-60mph 4.3s) to a 3.31 and 28.1" tall tire 305/30/20 setup, the acceleration dropped like almost a whole second (0-60mph 5.0-5.1s).

Currently running 3.73 and 28.1" tires and got the 0-60mph back down to 4.4s


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Old 07-14-2015, 05:08 PM   #8
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Hey man if you end up deciding to get 331 let me know I'm selling mine from the factory since iv upgraded to 373 and no use for them anymore.. Goodluck

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Old 07-14-2015, 09:18 PM   #9
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Quote:
Originally Posted by Ron11 View Post
I am thinking about changing the gear ratio in my GT. It has the 3.73 gear from the factory (track pack). I do almost all of my driving on the highway, and not really interested in red light to red light stuff. Don't get me wrong, I still love hammering the throttle. Around town, if I'm on level ground I don't even need 1st gear, as the engine redlines so easily. So I'm looking for a ratio that will lower the highway RPMs about 300-400. That will make 1st gear more usable, and should give better fuel economy too. I know it won't change the top end speed, as that's controlled by the computer. It should also match up well with another mod I plan down the road. I'll be adding an aluminum driveshaft at some point. Losing that 20lbs from the drive shaft should make up most, if not all of the gear ratio loss in drivability. What ratio do you think would accomplish that? Maybe a 3.55 or a 3.31??
What do you all recommend for a driveshaft supplier? Is Shaftmasters any good?
As far as gear ratio change, you can only gain about 230-240 RPM @ 70 MPH by going with 3.31 gears.
Stick with the 3.73's and don't bother with first gear.
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Old 07-16-2015, 11:09 PM   #10
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I have the 3.73s in my car and i like them a lot. I was worried that changing them was going to kill mpg but after checking it out i only dropped like 1mpg but i drive like a granny. 1st gear is however unusable lol.
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