Probably not your car but more or less your driving.....

He also has an auto (Apparently) so 4.10s wouldn't be bad for him either.

 

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roundman, you sure about that ratio? that just doesnt seem very accurate to me. gear change wont make that big a difference in mph, (the example you made)

 

I like my 4.10's
rarely do highway drivin and gas mileage isnt THAT bad, i travel about 40 miles daily and put about 9 bux a day of the good stuff

 

Hooking up in first through even third can be a problem with 4.10s. They're so low. Put it to you this way.....Going from say 2.73s or 3.08 or 3.27s to 4.10s is like adding a 50 shot of Nitrous Oxide. 4.10s can lower times by around 4 tenths easily. Oh and if you hook up well AWD cars won't have that much of an advantage anymore.

 

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Comparison: 4.10's in a 94-04 GT are equal to 3.73's in a Fox Body (all 5 speeds)

If 4.10's in a 94-04 GT are equal to 3.73's in a Fox Body, then you can say 3.73's in an automatic 94-04 GT are more like 3.55's.

I'd go 4.10 or you are just throwing away money if you are looking for maximum potential. Who cares about top end speed, only ******** drive 145mph on highways.

 

The one thing everyone is missing in this choice is your engine power output. For mild or stock motor you can do ok with 4.10's. But with a higher engine output clearing the quarter mile can be a problem. Most 5.0 hydraulic cam motors are limited to around 6Krpm before either you float valves or hit the limiter. With 4.10's and a 26" tall tire you're maxed at around 115mph in the quarter. That's a big problem if you can make the power to pull 120mph or more. I made this mistake with my 91 thinking 4.10 is the best drag gear set up. Now I'm wishing I would have done 3.55 or 3.73. Make sure you have enough gear for the power you're making.

 

trust me on this one, I double checked the math to make sure I was correct.
Assume you have a 26" tall tire, circumference is 6.81 ft. Neglecting overdrive and wind resistance, at an engine speed of 6,000 rpm with a 2.73 rear, 6000/2.73= 2197.80 rpm at wheels, then 2197.80*6.81ft/rev=14967.02 ft/min tire speed, 14967.02*60 min/hr = 898021.08 ft/hr divided by 5280 ft/mile = 170.08 mph wheel speed with a 2.73 rear end gear.

now with a 4.10 ratio, 6000/4.10= 1463.41 rpm at wheels, then 1463.41*6.81*60/5280=113.25 mph wheel speed with a 4.10 rear end gear.

The figures don't lie although I might BS you from time to time, I'm telling the truth now!
The motto of this story is: if you want top end speed, go with a higher gear and eventually you'll get there. if you want maximum accelearation, go with a lower gear and you won't get there but you'll get where you do get one hell of a lot faster!