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331 vs. 373 gears

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Old 01-02-2008, 10:39 AM   #1
ssemich
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Default 331 vs. 373 gears

Hello,

I have a 2007 Ford Mustang GT,5 speed manual. It has Superchips flashpaq, JLT CAI, CDC Skaker,CDC Chin Spoiler, CDC Foose Hood.

I am considering 373 gears and would like to know what the advantages and disavantages are? I heard you lose some of your top end?

My current gears are 331...I primarily drive highway. Car is a daily driver...


Thanks,


Steve
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Old 01-02-2008, 10:45 AM   #2
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Default RE: 331 vs. 373 gears

Hey there,

Go with the 3.73's. You will loose a little top end - but since you dont drive up there anyway (NOBODY does) its not a huge deal. You will loose a couple hundred RPM at freeway speeds, but will gain a noticble boost in pull from the bottom end.

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Old 01-02-2008, 10:49 AM   #3
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Default RE: 331 vs. 373 gears

Because our cars are drag limited, you might actually gain some top end speed.
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Old 01-02-2008, 10:54 AM   #4
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Default RE: 331 vs. 373 gears

Okay...Thanks....Another question...So going from 60-80 mph in 4th or 5th gear on the highway for passing will be quicker or slower?

Steve

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Old 01-02-2008, 10:58 AM   #5
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Default RE: 331 vs. 373 gears

get the 3.73's or even 4.10's are ok for daily driver. with my 4.10's when cruising, its not that noticable, but when you get on it the accelleration is much better. the pro's devinately out way the cons. you may lose 1 or 2 mpg's but who cares.
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Old 01-02-2008, 10:58 AM   #6
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Default RE: 331 vs. 373 gears

Quicker. You'd be revving higher, so you'd be closer to your powerband.
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Old 01-02-2008, 11:30 AM   #7
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Default RE: 331 vs. 373 gears

okay....great...Thanks for everyones help...


Steve
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Old 01-02-2008, 01:35 PM   #8
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Default RE: 331 vs. 373 gears

I have the 3.73's with a 5 speed as well, you will feel a BIG difference at Hwy speeds as compared to the 3.31's.
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Old 01-02-2008, 01:51 PM   #9
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Default RE: 331 vs. 373 gears

cool....looking forward to the kick in the pants feel....

Steve
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Old 01-02-2008, 01:56 PM   #10
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Default RE: 331 vs. 373 gears

Consider getting a new differential also. They are about 400-450$ and a great mod for future building. There won't be any extra labor since they have toremove the diff from the car anyway. Less $$ when you have to rebuild it later IF you have plans to make more power or going to the track. I'm in the process of buying parts for a new rear end build and will be replacing the diff at the same time.

The 3.73's will be great.
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Old 01-02-2008, 02:04 PM   #11
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Default RE: 331 vs. 373 gears

what part of the differential do you recommend? Brand?
What will replacing this part do?

Thanks,

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Old 01-02-2008, 09:17 PM   #12
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Default RE: 331 vs. 373 gears

The general recommendation is 3.73 automatic and 4.10 with a manual. Remember that Ford originally put a 3.55:1 ratio in the manuals and a 3.31:1 in the automatics. I persume they went to 3.31:1 in the manuals with an opitonal 3.55:1 to improve fuel mileage.

If you're going from a 3.31 to a 3.73, then you should certain feel it. Still, I'd consider 4.10:1 if I were you.

Almost everyone recommends gears made by Ford Racing Performance Parts. You can find lots of threads on the subject with the search button.
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Old 01-02-2008, 11:38 PM   #13
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Default RE: 331 vs. 373 gears

Quote:
ORIGINAL: ssemich

cool....looking forward to the kick in the pants feel....

Steve
I volunteer to do it.
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Old 01-03-2008, 10:09 AM   #14
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Default RE: 331 vs. 373 gears

Quote:
ORIGINAL: ssemich

what part of the differential do you recommend? Brand?
What will replacing this part do?

Thanks,

Steve
The OEM diff (Trak Lok)will handle plenty of power and most of us here including me have our stock differential. The problem with the stock differential is it will wear out faster than an aftermarket due to the type of clutch pack is has within the unit. Aftermarket diffs use stronger more efficient ways to transfer power. It works okay but eventually fails if you race alot or have alot of power. For regular driving you will probably never notice the diff going out or not working at 100%. You may notice one wheel spinning during a burnout. A locker from Detroit or Auburn with a different system for transfering power to the ground will last longer and be more efficent. They also make a limited slip diff which is what most of us need and replace our OEM with. Limited slip diffs are best on the street, but a locker generallyis the best on the track, short of a "spool".

Only reason I suggested it to you is to think of the future. If you plan on adding a supercharger or turbo in the future, it may be more cost effective to upgrade the differential while you are doing the gears. I should have done this when my gears were done the first time. Ford put 4.10's in for free, under warrunty, and did a crappy job. So I'm not out any cash.

Surf around and read about differentials. Go to Detroits website, Auburns website and gather some info. Take your time and do it right the first time.

If some of this doesn't make sense it's because I've been up for 36 hours or so.

Going to bed now.
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Old 01-03-2008, 10:56 AM   #15
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Default RE: 331 vs. 373 gears

Cool...I will do some looking around for the differential.

Steve
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Old 01-03-2008, 04:16 PM   #16
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Default RE: 331 vs. 373 gears

I don't think he meant this......Click the image to open in full size.
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Old 01-03-2008, 04:38 PM   #17
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Default RE: 331 vs. 373 gears

Funny....Not what I meant...But funny...

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Old 01-04-2008, 07:31 PM   #18
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Default RE: 331 vs. 373 gears

Get the 373's!

I would say if you do more highway 373's are the best route. I do mostly city; and i'll be going with 410's very soon. Your car will be quicker with a 373 gear change. You will get from 0-130 a lot quicker than with your stock gears. Some people claim that the stock gear 145 mph mark is still reachable with 373's or even 410s to due our cars being drag limited. The only difference is you will get there a lot faster.
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Old 01-04-2008, 07:31 PM
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