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Old Dec 14, 2007 | 01:08 PM
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Default Gear Upgrade

Im considering 3.73s in my 01 SS, how do yall think that'll affect my mpg? thanks...
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Old Dec 14, 2007 | 02:06 PM
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auto or six speed?
auto= quite a bit
six speed= not much at all
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Old Dec 24, 2007 | 09:23 PM
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lol its a six, but i think im gonna leave the tranny alone as long as i can haha...
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Old Dec 27, 2007 | 12:06 AM
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You should not notice a dramatic change in milage.

Jeff
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Old Dec 27, 2007 | 12:23 AM
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atleast go 3.90's or more with a 6spd, I only went 3.90's because I spend 90% of my time on the highway. The 3.90's were noticable, you most likely wont feel much of a change with 3.73's. most will tell you go 4.10's, which there are time I wish I went 4.10's then theres times I'm glad I didnt go with 4.10's.
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Old Dec 27, 2007 | 07:45 AM
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I had 3.90's in my 10 bolt and wished I went steeper. I put 4.30's in my 9" and love them. If you are going to swap gears make it worth it. Go at least 4.10's. You rpm's will be up 350 rpms from stock at 75 MPH on the highway.

3.73's are a huge waste of time and money with a 6 speed car, unless you have extremely high horse power #'s.

Gas milage #'s with 4.10's you might lose 2-3 mpg at the most.
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Old Dec 27, 2007 | 10:08 AM
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In town gas mileage with 4.10's sometimes actually stays the same, as you can use 3rd gear almost all the time. Bob
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Old Dec 27, 2007 | 01:26 PM
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4.10s for sure..
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