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rear end 3.73...4.10

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Old 01-23-2014, 08:57 AM   #1
DCzapla
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Default rear end 3.73...4.10

Well a new rear end is on my to do list. Ive been told to o.ly get a 4.10 that its the only way to go. Im not racing the car its just a nice weekend car, and something i would drive on a shmmer vacation. With that maybe a 3.73 would give me a balance between better performance, and good driveability. Comments opinions.
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Old 01-23-2014, 09:40 AM   #2
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I still love my 4.10s, even after supercharging. You probably have 3.55s now, so 3.73 would not be that big of a difference. 4.10s changed my fuel economy very little, the car cruises at 2500 RPMs @ 70. Just feels better passing, and overall it made my car more drivable.
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Old 01-23-2014, 10:22 AM   #3
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This is kind of a toss up. It really is going to depend on what kind of driving you do. If you're going on road trips and wanting to get the best gas mileage on the freeway, the lower gear ratio would be the better option. Is there a reason why you want to do a gear change? What are you trying to accomplish?
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Old 01-23-2014, 10:46 AM   #4
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Some numbers to ponder assuming manual transmission. What is your goal? What RPM range do you most prefer to drive in? When you look at the numbers, I just can't see 4.10s making a huge mpg difference for highway cruising.

5th gear 2500rpm/3.55/84mph
5th gear 2500rpm/3.73/80mph
5th gear 2500rpm/3.90/76mph
5th gear 2500rpm/4.10/72mph

1st gear 6500rpm/4.10/38mph
2nd gear 6500rpm/4.10/64mph
3rd gear 6500rpm/4.10/97mph
4th gear 6500rpm/4.10/129mph
5th gear 6500rpm/4.10/189mph - theoretical assuming you have the HP to get there

Assuming stock tire size and manual transmission.
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Old 01-23-2014, 12:27 PM   #5
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Its a 5 speed manual transmission. So maybe 4.10 wouldnt be so bad. Plus the driving around town i do tends to draw attention from lesser vehicles that want to test the pony. As itvstands right now the 3.55 does not get my car of the line at all!!
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Old 01-23-2014, 12:40 PM   #6
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Have you thought about doing any power upgrades to help it get off the line faster, rather than changing ring and pinion? More power will help it get up and go, but keeping the rpm down at cruising speed to conserve fuel mileage. Catback exhaust and cold air intake would help a lot. Just presenting another option for you.
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Old 01-23-2014, 03:56 PM   #7
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I have a ford racing bullitt CAI and a tune from brenspeed. Previous owner had UDPs on it as well, and he added some high flow cats along with a bassani axlee back
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Old 01-23-2014, 04:08 PM   #8
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3.73s will make your 5th gear like your 4th gear is now with 3.31s.
4.11s will make your 5th gear like somewhere in between 3rd and fourth.
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Old 01-23-2014, 04:11 PM   #9
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Well, in that case, if you've got the mods and still feel like it wont get out of the hole as fast as you would like, I would go with a 4.10. CPTCO is right. The difference between a 3.55 (providing that IS what you have in the vehicle) and a 3.73 is not going to be that noticeable. I was running a 3.73 gear in my 88' but I was right around 500hp, so it worked great. Good luck!
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Old 01-23-2014, 04:20 PM   #10
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Default 3.73

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Originally Posted by DCzapla View Post
Well a new rear end is on my to do list. Ive been told to o.ly get a 4.10 that its the only way to go. Im not racing the car its just a nice weekend car, and something i would drive on a shmmer vacation. With that maybe a 3.73 would give me a balance between better performance, and good driveability. Comments opinions.
Well I have 3.73 and as far as a DD like mine I feel a 4.10 might suffer a little on highway cruising unless staying under 60 is ok. I have a 5 speed so maybe much different if you have an auto. my 3.73 pulls very strong through all 4 gears. my 2c
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Old 01-24-2014, 12:46 AM   #11
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4.10s dude...go for it. I have them with an auto and a supercharger...all good.
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Old 01-25-2014, 10:52 PM   #12
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Never regretted my 4.10s once.
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Old 01-26-2014, 01:18 PM   #13
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I am very new and My earlier reply was just a thought from my opinion being use to driving 6 speed auto's. what would be a good distance highway cruising speed/rpm? at 65 in 5th i'm at 2200 and seems a little high. could just be the Borla cat back noise. would you make a 100 mile trip on the highway above 2200? thanks.
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Old 01-26-2014, 04:36 PM   #14
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4.10's will make you wish for a sixth gear, trust me.
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Old 01-26-2014, 05:49 PM   #15
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Just get 4.10s and be done with it. Those that gripe about traction or MPG issues that come with gears are either one of two things:
1. don't know how to drive the car
2. don't know how to drive the car

edit- forgot one more: 3. should be driving a civic hybrid or Prius instead of a Mustang
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Old 01-27-2014, 05:54 PM   #16
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Thanks Ricardo for the compelling commentary
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Old 01-28-2014, 06:19 PM   #17
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Yeah! Forgive my humor though, I'm military and sometimes go overboard.
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Old 02-03-2014, 06:37 AM   #18
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iv got 4.10s and commute 97 miles a day for work. 5pd. 70mph the whole way and get 23.7-25.2 ave. about 70% highway and 30% city. around town shifting at 3500ish and a few big romps and i still hang around 19ish.. if it a put skinny pedal all the time welllll then.. ya.

short version. 4.10s and dont look back.
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Old 02-04-2014, 10:08 AM   #19
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Unless you are dragstrip oriented, the best all around gear setup is 3.73 for the auto and 4.10 for the manual.
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Old 02-04-2014, 11:49 AM   #20
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I've run countless hours of testing using Cartest2000 (vehicle simulator). One thing I've found is that the 05-10 Mustang GT's work best with 4.10 rear gears (best acceleration and time to speed). I've had an 06 with 3.55's and another 06 with 4.10's, both were fine but the second one with 4.10's was a rocket. Also it didn't get that much worse fuel economy. It had Flowmaster super 40's and didn't drone either.

For 11-14 Mustang GT's the ideal rear gear is 3.73 from simulation testing. With the 6 speed the gearing is a little shorter so it is similar to the 05-10's 4.10 rear gears.

I'd say don't worry about gas, throw in the 4.10's and have some fun. If you ever get an 11-14, 3.73's instead. 15+, no idea, haven't simulated one yet.
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Old 02-04-2014, 11:49 AM
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