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Thread: 373 vs 410/411
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12-25-2009, 08:58 AM #1
373 vs 410/411
what is the difference in rpms / gas mileage in a m6 car with either 373s or 410/411s?
i have a m6 car and im trying to decide wich one to go with thanks much.
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12-25-2009, 09:42 AM #2
Probably 4.11's
Use this site, its very helpful. Plug your car information in, or use the pull down tabs for vehicle selection at the top. Very easy.
http://www.f-body.org/gears/370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator
Build in progress...
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12-25-2009, 09:59 AM #3
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Red Tint Jewelcoat- 2008 Trailblazer SS
Not much difference...but the 4.10's will be better for overall acceleration.
Gas mileage around town will be down a little more with the 4.10's, but on the highway it will be pretty much the same.
3.73's with a stock tire will turn about 1825RPM at 75MPH.
4.10's with a stock tire will turn about 2025RPM at 75MPH.
Personally, I have 4.11's and have been thinking about going to 4.30's.
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12-25-2009, 10:36 AM #4
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12-25-2009, 10:43 AM #5
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Red Tint Jewelcoat- 2008 Trailblazer SS
Take a look at that link Hi-Po posted for that kind of information.
Top speed should be calculated in 4th gear for the M6...as I don't like going WOT in overdrive gears.
4th gear top speed on stock tire with 3.73 = 127MPH (assuming 6200RPM redline)
4th gear top speed on stock tire with 4.10 = 115MPH (assuming 6200RPM redline)
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12-25-2009, 10:47 AM #6
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12-25-2009, 04:27 PM #7
Don't count out 4.30's though. I went 4.10's and now I wish I had not. It's not bad but with the m6 you can definatly get away with more gear.
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12-25-2009, 06:24 PM #8
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01-07-2010, 12:23 PM #9
There will be no measurable difference in gas milaege between the two. I went from 3:42s to 4:10s and lost less than 1mpg so the difference between 3:73s and 4:10s would be nonexistent. Go with the 4:10s. (or higher)
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01-07-2010, 03:56 PM #10
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BLACK- 2000 TRANSAM
I have 4.10. Not alot of difference in gas mileage. Big difference in torque & getting out of the hole. & pulling thru the all the gear range. Should have put 4.30
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01-07-2010, 04:23 PM #11
i too went with 4.11's definently no complaints.
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01-07-2010, 05:01 PM #12
I wish i had gone 4.30's but im very happy with the 4.10's no doubt. Made a huge difference in acceleration. Freeway driving for me is perfect and no complaints, rpms are still very low even at 70-75mph.
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01-07-2010, 08:05 PM #13
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Red- 2002 TransAm Firehawk
I have a six speed and went with 4.10's. I regret it. I shift a lot more, and RPM's feel too high at freeway speeds. Gas mileage was noticably worse. I would change back to stock 3.42's if it didn't cost so much. I guess 3.73's might be a good compromise, but I haven't tried that set up.
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