3.15 vs 3.55 limited slip?

[Dylan6cody]

I was wondering whats the difference between the 2 and which one has a faster 0-60 and which one is better for daily driving.

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[Baldilocks]

3.15:1 will be the better for daily driving and fuel economy. The 3:55:1 will result in faster acceleration (if you can get the power down) and slightly less fuel economy.

 

[Interstellar]

After lots of research, I went with 3.15 gears because I plan on boosting in the future. The 3.55 with some extra power apparently leads to lots of spinning in the low gears with the 3.55.

There's also 7 forward gears with 3 overdrive gears. I really see no need for the increased gear ratio, which would just lead to more shifts.

I believe that the 0-60 of the 3.15 can actually be quicker due to longer gears/in torque band longer, while the 3.55 is shifting.

 

[jbeansem]

I did a lot of research on this and went with the 3.55. Mainly because that is what I noticed the majority of people go with on the automatics who tried both in person at a dealership.

I have seen a lot of videos of people racing 3.15 against 3.55 and the difference is completely unnoticeable. In theory, the 3.15 is faster on the top end, 3.55 is quicker in the initial acceleration.

 

[93-Oct Mayne]

The coyotes torque is higher in the rpm range, so with 3.15s you spend a lot of time in daily driving outside of the power band and the car feels super sluggish/slow. My 2016 GT came with 3.15s and I ended up paying to have them swapped for 3.55s.

It's not even a question that the 3.55s are better, and honestly you're not even going to sacrifice much fuel economy unless you spend most of your time on the highway

 

[LETHAL]

Forced induction or not, 3.55. They make sticky tires for a reason.

My 18 GT was a 3.55 car. Ran hard and got 30mpg on the highway.

 

[MaxxRPM]

There's a reason why Ford's "performance package" comes with the 3.55s on the automatics.

 

[RJV15]

I got the 3.15, its going to be my daily, and 90% of my driving is highway miles.

If it wasn't my primary car, I would have got the manual and not even thought about the A10.

 

[jamespmoran]

I went with the 3.55, 3.15 is just too long in the tooth. On MY18 F-150 I had 3.31, when I ordered MY22 F-150 I went with the 3.73, much better choice. Applied same logic when ordering the stang. Plus the convertible is heavier. Can use the extra punch.

 

[angermgmt14]

Is there still a difference between the 3.55 offered as an option and the one included with the PP?

 

[HWill]

3.55 Here also with plans to add FI. From personal experience no way would I have went with 3.15.

 

[CAYOTE]

I went from 3.15 to 3.73 in my car and I’m very pleased with it. Car should have came with 3.73’s if you ask me. It helped my car down low where it struggled with the 3.15’s.

 

[robvas]

In theory, the 3.15 is faster on the top end, 3.55 is quicker in the initial acceleration.

What theory is this?

At what MPH or RPM does the 3.15 overtake the 3.55?

 

[Neggytive]

the difference is not only the gear ratio when you order the 3.55 option, it is a completely different limited slip system, clutches vs Torsen

That is why it is a $1000+ option for the 3.55 on the order sheet

If you have a 3.15 LSD in your mustang, the parts, meaning a 3.55 whole center section ready to drop in ( M-4001-88355B ) from @LevittownFordParts is under $1200 plus fluids.

The gears and install kit to swap out your existing gears will run you just shy of $500 and someone who can press bearings on and get the shim packs right for the proper gear meshing.

Just check the driveshaft flange as there are differences between stick and 10 speed cars

Plus you need to recalibrate the speedo for the new gear ratio, and maybe the transmission shift points


Personally I have never found myself wanting for the 3.55 the 3.15's work lust fine for me

 

[Farmer Fran]

IIRC

315 if you want to boost because the A10 does not like 6th gear slams
355 for a good NA build

I am 100% sure I will be corrected. But do you run 87 or 91/93

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