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Old 10-03-2006, 04:43 PM   #1
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Gears

Gears is the next thing on my list. What will my rpms be at when cruising at 70mph w/ 4.10s and 3.73s? I cruise at 2100 now with the original gears and at about 3100 when I hit the overdrive. Also if I drop in my gears w/o having a tune how will affect the cars performance?
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Old 10-03-2006, 04:55 PM   #2
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Re: Gears

you wont need a tune for rear end gears it wont effect it. The only thing you will need is a way to calibrate the speedo. You should be able to run a chip or a speedcal unit (depending on year/tranny)

For an auto (since the gearing is worse than a manual) 4.10s are generally a good choice but you really need to do a tlok since its the same amount of work.

I cant remember the exact percentage that the rpms will go up but if memory serves me right from stock to 3.73 it will be about 250-300 rpms more than what it currently is at~
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Old 10-03-2006, 05:13 PM   #3
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Re: Gears

:pop2: Look here.
Tech Equations - ThirdGen.org

http://www.mustangevolution.com/foru...ula-22451.html
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Old 10-04-2006, 05:24 PM   #4
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Re: Gears

you might want to get a tune too while you're at it..instead of getting a speedcal, then a tune if you plan on taking it that far
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Old 10-05-2006, 12:24 AM   #5
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Re: Gears

JROC: This info seems very helpful if I were able to determine all the numbers to plug into the formula. My car is an 04 3.9L automatic and my tires are stock 225/55/16. I need to know rear end ratio, transmission gear ratio and tires' radius in inches. I don't know what type of transmission I got. I've taken it to a few shops to ask about gears and some say its got an AOD and other a 4rw70 or something like that, what transmission do I have?
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Old 10-05-2006, 12:26 AM   #6
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Re: Gears

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Originally Posted by SpectorV View Post
you wont need a tune for rear end gears it wont effect it. The only thing you will need is a way to calibrate the speedo. You should be able to run a chip or a speedcal unit (depending on year/tranny)

For an auto (since the gearing is worse than a manual) 4.10s are generally a good choice but you really need to do a tlok since its the same amount of work.

I cant remember the exact percentage that the rpms will go up but if memory serves me right from stock to 3.73 it will be about 250-300 rpms more than what it currently is at~
If 3.73s give you rpms of 2400 when cruising at 70mph that's perfect for my liking. How about 4.10s?
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Old 10-05-2006, 09:09 PM   #7
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Re: Gears

Any input anyone? Doesn't n e one have 4.10s?
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Old 10-09-2006, 11:59 PM   #8
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Re: Gears

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Originally Posted by megax29 View Post
JROC: This info seems very helpful if I were able to determine all the numbers to plug into the formula. My car is an 04 3.9L automatic and my tires are stock 225/55/16. I need to know rear end ratio, transmission gear ratio and tires' radius in inches. I don't know what type of transmission I got. I've taken it to a few shops to ask about gears and some say its got an AOD and other a 4rw70 or something like that, what transmission do I have?
you have a 4r70w transmission with an overdrive hence the AOD.
with 4:10 you'll be around 2750 or so at 70 MPH.
try this RPM calculator....Gear Comparison
It's a bit easier to input your tire size info.
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Old 10-18-2006, 04:06 PM   #9
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Re: Gears

Hey man thanks that calculator was really helpful. I think 4.10s maybe to much for me since I do a lot of hwy and 3.73s may not be enough so I'm thinking of going with 3.90s. Do you know of any shops that can do this job at a reasonable price in the bay area? I've asked at 3 shops and all 3 of them have quoted over $600 out the door.
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Old 10-18-2006, 04:14 PM   #10
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Re: Gears

I can tell you I roll at 2800RPMs at 80mph with 4.10s. My old are with an auto and the same gears cruised at the same RPM as well. 70 youll probably be around 2500-2600 RPMs with 4.10s, I dunno about 3.73s
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Old 10-18-2006, 05:31 PM   #11
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Re: Gears

With 3.73s, I do 80 at about 2600 RPMs.
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Old 10-24-2006, 03:32 PM   #12
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Re: Gears

I do about 2450 rpms at 80mph with my stock gears. I think they're 3.27
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