3.73 Gears -Top Speed - Forums at Modded Mustangs
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post #1 of 26 Old March 23rd, 2008, 10:54 AM Thread Starter
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3.73 Gears -Top Speed

So, sorry if this has come up recently, or is a common question, but I'm in need of an answer here...

I have a '96 GT, and I'm changing the gears and I'm pretty sure I want 3.73's. I know what they do, how they work, and how to install them. I'm wondering by how much do (you think) they lower your top speed? Just say its a stock 'Stang. Is the top speed noticebly lower? Is there a way to figure it out exactly (formula)?

Thanks.
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post #2 of 26 Old March 23rd, 2008, 10:57 AM
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you don't have enough power to ever reach your top speed.

areo dynamics will stop that.

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post #3 of 26 Old March 23rd, 2008, 12:30 PM
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I've been 155 with my 3:73's

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post #4 of 26 Old March 23rd, 2008, 11:51 PM Thread Starter
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155 is pretty impressive haha. Thanks.
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post #5 of 26 Old March 24th, 2008, 12:39 AM
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post #6 of 26 Old March 24th, 2008, 12:43 AM
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I'm not sure, ive gotten up to about what my speedo says is 138 which is about 128 with my gears.
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post #7 of 26 Old March 24th, 2008, 01:01 AM
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Quote:
Originally Posted by HMUSN View Post
you don't have enough power to ever reach your top speed.

aerodynamics will stop that.
I hear ya. I've got a .50:1 6th gear. I should look up what my theoretical top speed is with 3.73s.
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post #8 of 26 Old March 24th, 2008, 01:10 AM
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yea im a bit confused as well.. i have heard if you get new gears your top speed gets all f$*%'d up.. is this true? if i get 4.10s will i be slowed down at higher speeds?

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post #9 of 26 Old March 24th, 2008, 01:52 AM
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no you won't be slowed down at higher speeds, but you top speed is reduced because you are turning more RPMS
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post #10 of 26 Old March 24th, 2008, 01:53 AM
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and like HMUSN said, aerodynamics come into play hardcore at high speeds. you should worry about having more power, and lots of open road with no cops versus redlining it in 5th
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post #11 of 26 Old March 26th, 2008, 08:58 PM
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I've pinned my speedo past 150 with stock gears and wasn't near redline. With my 3:73s I've only been 140, but getting closer to redline. It still has enough gear left to go up to 150 with 3:73s, for sure.
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post #12 of 26 Old March 26th, 2008, 09:00 PM
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there is enough gear with 4:10's too.

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post #13 of 26 Old March 26th, 2008, 10:53 PM
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I'm going to say if you are worried about top speed with any gear ratio you better be running the 9's in the 1/4 mile.

You are never ever going to hit top speed in a reasonable or safe amount of time. I don't even think Terminators are worried about it.

Plus, when are you ever going to peg 155? That's for single digit cars.
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post #14 of 26 Old March 28th, 2008, 11:32 PM
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Found a free program online that does the calculating for you once you've entered tire size and gear ratios. It's called GearCalc. Looks to have been made in the UK, but has options for metric and imperial measurements.

Theoretical top speed for my Viper-spec T56 and 3.73s:

Gear --- Mph per 1000 RPM --- Mph @7000 RPM
----------------------------------------
1 --------- 7.69 -----------------54
2 --------11.50 ------------------80
3 --------15.74 -----------------110
4 --------20.47 -----------------143
5 --------27.66 -----------------194
6 --------40.93 -----------------287


Guess I'd better follow some ricers to the Tacky Aluminum Wing store.

Last edited by Droptop Snake; March 28th, 2008 at 11:36 PM.
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post #15 of 26 Old April 1st, 2008, 09:59 PM
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Yea, 3:73s aren't going to hurt your limit you unless you want to go 165+ for some reason. Your speedo only goes to 150 anyways. I've gone 140 with my 3:73s and was about 5000 rpm or so I think.

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post #16 of 26 Old April 1st, 2008, 10:04 PM
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120 for me lol. It took about 2 miles to get there or more lol



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post #17 of 26 Old April 3rd, 2008, 05:19 PM
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The gears should help you pull harder on top-end, my old 96', 5-spd barely made it too 135 mph.
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post #18 of 26 Old April 3rd, 2008, 07:14 PM
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Quote:
Originally Posted by Droptop Snake View Post
I hear ya. I've got a .50:1 6th gear. I should look up what my theoretical top speed is with 3.73s.
welcome to MM curtis how long you been browsing hear lol?

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post #19 of 26 Old April 4th, 2008, 06:21 AM
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It also depends on tire size, horsepower, etc. I was running 373's with a pretty much stock 4 valve...in 4th gear i would top out 140ish with a 26" tire...went like 13.20@ 106...i put the 410's on the same car topped out around 130ish but went..12:80@ 109...put the blower on the car and with the 26" tire was topping out @ around 120-125 in 4th..put a 28" tire on the same car topped out around 135....

i like this calculator myself it works pretty darn close each time for me
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post #20 of 26 Old April 4th, 2008, 01:03 PM
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^those are some big tires



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