3.73 or 4.10 gears - Ford Mustang Forum
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post #1 of 21 (permalink) Old 05-24-2012 Thread Starter
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3.73 or 4.10 gears

I want to install some new gears for my Shelby GT Manual, I cant decide on which gears I should purchase.. I know everyone says that highway driving is bad for 4.10, I dont do too much high way driving but I do drive on the highway and if I got the 3.73 i'm scared that it wont make a huge improvement? Can you guys give me some suggestions? And what kind of price installation should cost? Thanks
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post #2 of 21 (permalink) Old 05-24-2012
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Quote:
Originally Posted by SuperFreak123 View Post
I want to install some new gears for my Shelby GT Manual, I cant decide on which gears I should purchase.. I know everyone says that highway driving is bad for 4.10, I dont do too much high way driving but I do drive on the highway and if I got the 3.73 i'm scared that it wont make a huge improvement? Can you guys give me some suggestions? And what kind of price installation should cost? Thanks
If you want to stay N/A (no power adders) then its an easy decision. 4.10s or potentially higher baby
If you wanna go forced induction (s/c, turbo, nos) then go 3.73s
Its really that simple and once you make that decision jump on those gears! You wont regret it.

I value acceleration more than top speed. I'm crazy, not dumb.
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roush cai, black pype bomb resonators, x pipes, pacestter longtube headers, deleted cats, zex nitrous currently spraying 50hp shot, sct 93 all out tune. Next on the list is a svt 8.8 rear with 3.73 and an aluminum driveshaft
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post #3 of 21 (permalink) Old 05-24-2012 Thread Starter
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Does 3.73 make a big enough difference for the price?
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post #4 of 21 (permalink) Old 05-24-2012
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Does 3.73 make a big enough difference for the price?
In my case going to 3.73 literally transformed my car...
(bear in mind though my OEM gears were 2.73)
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post #5 of 21 (permalink) Old 05-26-2012
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I went to 373's and it made a huge difference but I also started with 273's
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post #6 of 21 (permalink) Old 05-26-2012
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4:10s are great they really dont do much worse on the highway...just a few more miles per gallon with fuel! if you want the acceleration 4:10s are very great!

mild cammed 302 / AOD transmission / 8 in rearend / 4:11 gears / eaton posi trac / dual flowmaster exaust / patriot long tube headers / lowered 2in / B&M rachet shifter / rear air shocks / custom stabilizer bars (quarter mile fastest 13.9 sec 102.2 mph) "The list goes on"
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post #7 of 21 (permalink) Old 05-26-2012
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Go with 3.90s. Install price 300-350ish

3.73s wont be much of an improvement to me.

4.10 will be way to much for a manual car and a Shelby on top of it, If you don't have any traction now kiss it all goodbye haha. Plus will you top out pretty quick on the highway.

3.90s will still give you that power down low and up top but wont make it as ridiculous as 4.10s

3.90s

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post #8 of 21 (permalink) Old 05-27-2012
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what gear are you running now? I am guessing a 3.55 in a Shelby. A 3.73 won't be big difference. The 3.90 might be what you are looking for. I used to run a 3.91 in a 9 inch with 4 speed, it went down the freeway around 4000 rpm at 80 mph. We didn't care anything about gas mileage, gas was 25 cents a gallon back then. With the 5 speed the 3.90 gear should be manageable and your gas mileage shouldn't take to big of a hit.
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post #9 of 21 (permalink) Old 05-27-2012
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Go with 4.10s, best decision I ever made so far with my car. MPG only went down by two on the highway (I get about 24 MPG now) but my SMG (smiles per gallon) shot up BIG time!

And to the guy who said 4.10s would be way too much for a manual, especially a Shelby, all the Shelby GT has for added performance compared to a GT is a CAI so I dont know what you're talking about when you say "especially a Shelby." Although it does means he's going to have more fun with his 4.10s, that's what!

You'll hear some people say you have no first gear with 4.10s but I beg to differ, I've had no problems with first at all taking off or shifting and after a while I cant even tell the difference just driving, although from 3.55s to 4.10s, you can tell a difference with first right after getting the new gears installed. But honestly, you get used to it in a day, adapt, and use first gear like you did before. It just climbs up the RPMs a little faster, it's not that big of a deal like some people make it.

I've also found out that most people who say that there's no first gear with 4.10s, are usually the ones who dont even have 4.10s in the first place. I'm sure some people do, but every person I've asked so far "How do you know that there's no first gear?" dont even have them installed.

If you're worried about how high of RPMs you'll be at on the highway, I'm at 2500 RPMs at 70 (also gets you out of the drone zone if you have that problem), cant really tell much of a difference just cruising and the MPG still isnt bad at all, like I said, only a 2 MPG drop for a much more fun car. If you're worried about say, a quarter mile time, you'll top out of 4th gear around 120. And think of it this way, you'll have to push serious HP to get past 120, the new '13 GT500 finished the quarter mile going 125, so that should tell you something. You'll be fine in the quarter mile too.

And as someone else said on here, about $300-$350 to install.

4.10s for N/A, 3.73s for FI. I'm going FI in the future but still went with 4.10s anyway because they're THAT much fun and THAT much worth the money.


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2008 Mustang GT/CS: 5 speed | FRPP 4.10 Gears | Bama 93H Tune | Magnaflow Magnapacks | Bassani O/R X Pipe | Airaid CAI | MGW | J&M LCAs | Saleens 19x8.5
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no bro you can't go wrong with either one...with 3.73s it's like you are always a gear lower than stock...5th is actually "usable", it's the traction issues that will be amplified with 4.10s...plan on a new rear setup with either choice for best results
My biggest complaint with the gears is that the car is so fast that you can find yourself quickly exceeding the speed limit without realizing it...a quck blast in 3rd...oops sorry officer I didn't know I was going 80, in that school zone...lol, kidding
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post #11 of 21 (permalink) Old 06-05-2012 Thread Starter
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Wow guys that helped a lot, but I'm planning on supercharging this car one day and I heard the 4.10's are a little to much for that. And like the 3.90's but I wanted them made by ford because I've read bad reviews on other brands for the gears
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I went with 3:73's and I really like them, one of the best and most noticeable upgrades! oh and I daily drive it!

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Quote:
Originally Posted by Storm75 View Post
In my case going to 3.73 literally transformed my car...
(bear in mind though my OEM gears were 2.73)
It LITERALLY transformed your car huh? So it's an airplane now? Maybe a dump truck? It's Bumble Bee!!!
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I have the factory 3.73 in my 2013 GT which comes with the six speed.

I did drive a GT500 without 3.73s as well.

Since my car is very new I have not done any hard acceleration tests but I can say what I'm getting for RPM on the hiway.

at 120 Km/h I am running about 2200 rpm in sixth gear. For my amercan friends that is 75 mph.....

The GT500 was running at about 1900 to 2000 rpm at the same speed.

Personally I would stick with 3.73s since you are looking at forced induction and use the car as a daily driver. Even a little savings in fuel is good since you can use that towards more mods.... and with fuel prices continuing to rise it could add up faster.

Arrived 2012-10-26.... 2013 GT DIB, Brembo Performance Pack, 401A option pack, ShakerPro, Electronics Pack, Rear sensor, security pack, pedestal spoiler.
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i have 3.73s installed and was thinking of a bigger gear 4.10s but the gears will make a huge difference

1990 "whitefox" 1990 vert procharged 331 dss stroker custom tune by ASSC many mods to long to list it's a slooow process !
speed is just a question of money how fast do ya wanna go !
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