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Unread 01-10-2009   #1 (permalink)
TLayson23 is offline Rookie

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Default Gears: 4.10 Vs. 3.73 for my 2001 Mustang GT 5-speed

Hello everyone, I've decided to get new gears for my 2001 Mustang GT Convertible, 5-speed manual. I'm having trouble deciding between 4.10 gears and 3.73 gears. I use my car as a daily driver and would like to keep my gas mileage as good as possible; however, i love horsepower. I'm just wanting some opinions of which gears i should go with from people who have 3.73 or 4.10 gears or knowledge of them, and why i should go with that gear. Thanks!
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Unread 01-10-2009   #2 (permalink)
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the important question 373VS410

gears do not increase HP
they get you to the power band faster

373's will get u a better start, not bad on gas. 410 will get you off the line in a hurry, but a more impact on gas.

eithr one i reccomend a T loc

i was dead set on 4.10 till i ran the numbers.

PM me and ill tell you what your lookign at.

just find out your 5th gear ratio in your transmission, and your tire diamater (edge to edge)

ill tell you a given speed, at an RPM with 373 and 410. you can see the difference for yourself

either way u need to corerct your speedo
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Unread 01-10-2009   #3 (permalink)
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also if u got 3.55's 373 isint gonna help much maybe a 3.90
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Unread 01-10-2009   #4 (permalink)
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Decide if you will add a power adder.
If you might, get the 373 gears.
Mileage isn't that bad, I think I lost 1-2 on highway when I went from the 327 to 373 in my 2000 GT. City mileage didn't change.

I used this website to decide on the 373s,
410s would have made 1st on the T45 worthless.

Speed/RPM Calculator
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Unread 01-10-2009   #5 (permalink)
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that works too my program is similar to that i can jsut do alot more, but that will tell you basicly the same
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Unread 01-10-2009   #6 (permalink)
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I use mine as a daily driver and Im getting 4.10's. 3.73's are better with Nitrous or Supercharger. 4.10's if N/A. I dont think gas is that much more of an impact with 4.10's over 3.73's. If you cruise in 4th gear, just throw her in 5th. Thats what I plan on doing.

And gears dont increase horsepower like 05 Horse said.
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Unread 01-10-2009   #7 (permalink)
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I would go with the 3.73's. They're a good round-about gear for what your looking for.
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Unread 01-11-2009   #8 (permalink)
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Just split the diff and go with 3.90. There a little more money but using that calculater there about right to avoid having to shift into 5th at the end of the quater. I'm thinking about going with 3.90's. Anybody no a reason not to go with 3.90's other then price?
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Unread 01-11-2009   #9 (permalink)
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im going w/ 3.90's in my 5spd
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Unread 01-12-2009   #10 (permalink)
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Thanks everyone, i guess ill be checking out the 3.90's because a good 'in between' sounds like the way to go. I appreciate the help!
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Unread 01-14-2009   #11 (permalink)
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I got 3.90's i have no problem with them i love it.....i had them done about a year ago
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Unread 01-15-2009   #12 (permalink)
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How is 1st gear for the 390's with LT headers?
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