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Unread 10-12-2010   #1 (permalink)
Monstrosity is offline Rookie


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Graham   North Carolina
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Default Best Gears for my 1994 Mustang GT?

I have a 1994 Ford Mustang GT Convertible 5 speed with stock gears and I'm debating on changing them.

Specs:
5.0L Engine bored .30 over
Headers with oversized valves
B303 cam
Cobra Upper and Lower Intakes
75mm throttle body
Cold Air Intake
Pro 5.0 shifter
offroad Hpipes with flowmasters

I don't know what mods matter, so I listed em all.

I've been told 3.73's or 4.10's.

What are the pros and cons of both of those gears?

Gas mileage compared to stock gears? around 16mpg atm

Accelaration increase?

Highway driving?

And anything else
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Unread 10-12-2010   #2 (permalink)
YLDPONY is offline SHELBY GT 350 Member

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Although some people like 4.10s with a manual, most don't. I have had them, and I didn't. I would look at 3.55s or 3.73s. I have had both of those as well. I currently have the 3.73s and I love them! The 3.55s were a big improvement over stock and might offer a little better MPG, but the 3.73s make it a bit more lively.
Around town I pull 16-17 MPG with the 3.73s, last year I did an extended road trip and managed 21.6 on the highway.

Whichever gear you get you will love them. The stock gears are ridiculous. This is a handy calculator:
Ford Mustang: Mustang Tech: Calculators & Decoders: RPM Calculator
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Unread 10-12-2010   #3 (permalink)
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Going from 2.73s to 3.73s in my 92 lx made a night and day difference in my cars performance. Plus it doesn't kill your gas mileage.
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Unread 10-12-2010   #4 (permalink)
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I say if its manual go 3.73 for automatic 4.10 !!
I love my 4.10 gears it pulls like a motha******
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Unread 10-12-2010   #5 (permalink)
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+++++ 3.73 is what you want, if its a hwy/town driver. If its strictly hwy thne get 3.55 you will not notice the difference and the gas mpg will be a little better. If its strictly town driven then just the opposite the 3.73 will be better mpg or even 4.10. You wont like the 4.10 on the hwy
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Unread 10-12-2010   #6 (permalink)
302Feen is offline SHELBY GT 350 Member


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3.73's. The MPG's between 3.55 and 3.73 would hardly even be noticealbe, but you'll get the added benifit of the better acceleration. I have 3.73's in my 5 speed and couldn't be happier!

4.10s would make your first gear practically useless.
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