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Old 04-22-2008, 05:12 AM   #1
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Talking what rpm are you running with your gears

iam looking to change my 3.31's to either 3.73's or 4.11's i was just wondering what rpm people where running in the new gt's with these gears.
70---???
80---???
thanks
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Old 04-22-2008, 08:17 AM   #2
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Re: what rpm are you running with your gears

around 70-75 I am pushing right at 2k rpms with 3.55s. Not sure what the final drive is off the top of my head for the T-56 in the 03/04 cobras.
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Old 04-22-2008, 08:56 AM   #3
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Re: what rpm are you running with your gears

at 75 MPH I'm turning 2000 RPM with 3:73

Damn it !!!! My mistake at 70 MPH it's 2000 at 75 MPH it's 2200
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Old 04-22-2008, 02:27 PM   #4
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Re: what rpm are you running with your gears

I think im wrong, I think its lower than that let me get back to you
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Old 04-22-2008, 10:29 PM   #5
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Re: what rpm are you running with your gears

2150 with 3.45 @ 70mph
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Old 04-22-2008, 10:53 PM   #6
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Re: what rpm are you running with your gears

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at 75 MPH I'm turning 2000 RPM with 3:73

seriously? damn thats pretty good

i turn 2k at 70 on stock 3.27s
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Old 04-22-2008, 11:12 PM   #7
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Re: what rpm are you running with your gears

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seriously? damn thats pretty good

i turn 2k at 70 on stock 3.27s
differnt trans with different ratio. t5 lower geared 5th gear
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Old 04-22-2008, 11:24 PM   #8
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Re: what rpm are you running with your gears

obviously........i didnt know it was that big of a difference though
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Old 04-22-2008, 11:28 PM   #9
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Re: what rpm are you running with your gears

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obviously........i didnt know it was that big of a difference though
sorry, my bad... i lack the filter most people have of what they say or type.
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Old 04-23-2008, 05:30 AM   #10
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Re: what rpm are you running with your gears

cool my 93 5 liter turns 3400 rpm at 75 with 3.73's but i am also running a t5 out of a 84 thunderbird turbo 4cyl. so i dont mind getting worse mileage i just dont want to go as extreme as the 5 liter. so i would like to stay around 25-2600 rpm at 75 i am at 2k with 3.31's so what gears would you recomend?
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Old 04-23-2008, 08:01 AM   #11
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Re: what rpm are you running with your gears

from what ive seen the 3650 and the t56 have the same final gear (.62). and i run 75@ 2000 and 95@2500 with the stock 3.27

gear ratios are just that... ratios... so all you have to do is take your rpm at any give speed and multiply it by the difference in the ratios

IE... if i go 75mph at 2000rpms with 3.27's then with 4.10s i will be at 2000(4.10/3.27)=2500 rpms


so if you know your own speed at an RPM then you can figure it out...

oh yeah... if your running an auto you have to make sure your torque converter is locked up or youll get funky readings!!!
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Old 04-23-2008, 08:07 AM   #12
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Re: what rpm are you running with your gears

you can search for calculators and find them all day long... or ive actually made them in excel
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