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2005-2010 Mustang GT Tech Forum

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Unread 10-19-2010   #1 (permalink)
2v 99GT is offline Rookie

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Thumbs down gear ratios for 2007 Mustang GT

Hey what gear upgrade wo you Guys recommend for an 07 GT
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Unread 10-19-2010   #2 (permalink)
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Too little info.

What gears do you have now?
What do you hope to accomplish?
Auto or manual transmission?
Are you staying naturally aspirated?
Do you drag race?
What tires, suspension mods do you have?

Etc etc etc

don't listen to anyone who recommends some gear without answering such questions...
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Unread 10-19-2010   #3 (permalink)
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Quote:
Originally Posted by 2v 99GT View Post
Hey what gear upgrade wo you Guys recommend for an 07 GT
Way to vague of a question without knowing your future plans for the car and your current setup.
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Unread 10-19-2010   #4 (permalink)
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Stock now but plan to mod looking for faster acceleration . The gears that are in it now are 3.55's. Wondered if 4.10's lower the top speed to much.
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Unread 10-19-2010   #5 (permalink)
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4.10s will not lower top speed that much, in fact our cars top speed is hindered by aerodynamics and I believe it's governed also. You will still be able to reach 145-150 with 4.10s.
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Unread 10-19-2010   #6 (permalink)
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Thumbs down

Would 4.10's be better than 3.73's
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Unread 10-19-2010   #7 (permalink)
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Since you already have 3.55s it would be a waste of time and money to go to 3.73s. I went from 3.55s to 4.10s and I am glad I did. 4.10s are just fine for hwy use; I drive about 55 miles a day on the hwy and I have zero complaints.
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Unread 10-20-2010   #8 (permalink)
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Quote:
Since you already have 3.55s it would be a waste of time and money to go to 3.73s. I went from 3.55s to 4.10s and I am glad I did. 4.10s are just fine for hwy use; I drive about 55 miles a day on the hwy and I have zero complaints.

Good thing I started out with 3.31's.... :nogrinner

Any mod's are a waste of money unless this is how you're making your living.....

If you have any intention of going FI, hold off... As mentioned earlier, too little info... AND there is no right answer...... When my car was NA, I felt 3.73's were perfect. Now that my car is SC I wonder what the 3.31's would feel like.....

Do a search. There have to be a zillion different threads on gears....

Even then it's really personal preference.....

Here's a quote for you..... DON'T FEAR THE GEAR!!!! 4.10'S ARE FOR WUSSES!!!!! NO LESS THEN 4.30'S OR GO HOME!!!!!! -jk






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Unread 10-20-2010   #9 (permalink)
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I have 3.90's. I have no problem going 145 mph with the 20" tires. With the 127300 Compcams and the 3.90 gears, the acceleration is 0-80 mph in 6 seconds with a Brenspeed 93 octane race tune. With 15" drag radials the car has been up to 165 mph.
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Unread 10-20-2010   #10 (permalink)
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Quote:
Originally Posted by bearbone View Post
I have 3.90's.

With 15" drag radials the car has been up to 165 mph.
Those must be some pretty darn tall tires!

:laughlitt

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Unread 10-21-2010   #11 (permalink)
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Quote:
Originally Posted by 2v 99GT View Post
Stock now but plan to mod looking for faster acceleration . The gears that are in it now are 3.55's. Wondered if 4.10's lower the top speed to much.
not to be smart, but how do you know you don't have 3.31's like most 07's?
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Unread 10-22-2010   #12 (permalink)
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Quote:
Originally Posted by topbliss View Post
not to be smart, but how do you know you don't have 3.31's like most 07's?
It has 3.55's. I know quite a bit about cars, just haven't done very much performance upgrading on mustangs 05's and newer.

Last edited by 2v 99GT; 10-22-2010 at 12:30 AM. Reason: I'v worked on quite a few 2v 4.6s.
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Unread 10-22-2010   #13 (permalink)
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You still have not said if it's a stick or an auto. I don't want to just assume that it's a stick, but if it is 4.10s might be a bit deep. I would go with 3.90s if it's a stick and 4.10s for auto. That as stated earlier depends on what your future plans are for the car. I have an auto that's N/A with 4.10s and it's a blast to drive. It will however brake the rear tires loose at the drop of the peddal. The deeper gears will give your car more of a hair trigger.
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RWHP/RWTQ is adequate
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Unread 10-22-2010   #14 (permalink)
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3.55s were not an option for autos so we can assume he has a manual. I wouldn't get 3.90s as the only company that makes them is motive and unless the install is 100% they are susceptiable to gear whine.
Here is a good article:
Top 10 Low-Buck Parts Under $500 - Muscle Mustangs & Fast Fords magazine
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Unread 10-22-2010   #15 (permalink)
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Quote:
Originally Posted by gmantheman View Post
3.55s were not an option for autos so we can assume he has a manual.
That's what I was thinking but I hate to assume. I know about the wine, I just don't 3.73s would be worth the cost and 4.10s might be overkill.
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RWHP/RWTQ is adequate
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