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Old 06-21-2015, 08:06 PM   #1
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What's my gear ratio?

I bought a 2011 5.0 used a month ago. I had a 2011 3.7 for about a year, and it had the 3.31 ratio. The shift points on each car are at different speeds/rpm (I.e. The v6 would be at 2k rpm going 35mph in 4th, but the v8 will be at about 2k rpm going 35rpm in 5th )

Wondering if the v8 has the same ratio, I know stock is the 3.31, but this car has every available option, other than the glass roof, so I could see it might have had the upgraded gear ratio from factory too...

Anyway to figure it out or would I have to take it to a mechanic?


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Old 06-21-2015, 08:18 PM   #2
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Quote:
Originally Posted by nicholasmadill View Post
I bought a 2011 5.0 used a month ago. I had a 2011 3.7 for about a year, and it had the 3.31 ratio. The shift points on each car are at different speeds/rpm (I.e. The v6 would be at 2k rpm going 35mph in 4th, but the v8 will be at about 2k rpm going 35rpm in 5th )

Wondering if the v8 has the same ratio, I know stock is the 3.31, but this car has every available option, other than the glass roof, so I could see it might have had the upgraded gear ratio from factory too...

Anyway to figure it out or would I have to take it to a mechanic?


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Old 06-21-2015, 08:30 PM   #3
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You can also put your vin into a decoder in fords website and it will show you the window sticker. If it doesn't mention anything about the gear ratio then it's 3.31 for a manual. If it's got 3.55's or 3.73's from the factory the window sticker will notate that.


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Old 06-21-2015, 08:35 PM   #4
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Okay thanks guys!


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Old 06-21-2015, 08:55 PM   #5
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Quote:
Originally Posted by nicholasmadill View Post
I bought a 2011 5.0 used a month ago. I had a 2011 3.7 for about a year, and it had the 3.31 ratio. The shift points on each car are at different speeds/rpm (I.e. The v6 would be at 2k rpm going 35mph in 4th, but the v8 will be at about 2k rpm going 35rpm in 5th )

Wondering if the v8 has the same ratio, I know stock is the 3.31, but this car has every available option, other than the glass roof, so I could see it might have had the upgraded gear ratio from factory too...

Anyway to figure it out or would I have to take it to a mechanic?


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It's not just the transmission gears and the rear end gear ratios that determine the RPM shift points. Aside from the power input difference...
The cars computer relies on several sensors to decide when and how to shift.
1. Input shaft speed sensor - Engine speed on the transmission side of the torque converter
2. Output shaft speed sensor - Road speed
3. Throttle position - How far the accelerator is pressed
4. MAP sensor - Engine intake vacuum, which is a function of throttle position and engine load.
5. Temperature - Shift firmness varies based on transmission temperature to account for the fluid's properties over the wide range of operating temperatures.

So when you find out the gear ratios, it more than likely won't correlate, due to other variables.
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Old 06-21-2015, 09:16 PM   #6
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I believe the auto 2011 GT only came with 3.15 gears. The manual came with 3.31 standard and 3.55 and 3.73 as options.
Here's your trans gears...
6-speed automatic gear ratios(believe the V6 and the V8 are the same.)
1st 4.17
2nd 2.34
3rd 1.52
4th 1.14
5th 0.87
6th 0.69
Final drive 3.15:1
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Old 06-22-2015, 11:12 AM   #7
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is yours stick or auto (if every option is true never mind) No one yet mentioned on the MT-82's the V6/V8 have different gears inside them.

nice upgrade btw
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Old 06-22-2015, 11:44 AM   #8
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OP was comparing shift points. I think it's safe to assume auto.
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Old 06-22-2015, 11:46 AM   #9
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Tire size can also affect what rpm you are at, at a given speed. Have you compared tire sizes as well?


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Old 06-22-2015, 12:04 PM   #10
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2011 v6 manual trans, 255/45/18r

2011 v8 manual trans has 19' rim I believe it's 235/45. May be 245 tho..


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Old 06-22-2015, 12:16 PM   #11
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I give up!
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Old 06-22-2015, 12:16 PM   #12
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Gear ratio is on the door panel on my 2007 GT. Just realized you were talking about modified gear ratio. OOPs.
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Old 06-22-2015, 12:20 PM   #13
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jack it up, put it in neutral, spin the tires compare tire revs to driveshaft revs do math
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Old 06-22-2015, 02:29 PM   #14
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Don't see it on my door sticker, I'll check the window sticker later this evening Click image for larger version

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Old 06-22-2015, 02:47 PM   #15
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Yeah, what Strange Mud said. The gear ratio is how many revolutions the rear wheels make compared to one revolution of the drive shaft. Put the ride up on blocks/jack stands. Put a piece of tape on the rear section of the drive shaft to use as a reference mark. Put it in neutral and rotate a rear wheel and watch until the drive shaft make one complete revolution. The number of drive shaft revolutions : one is your gear ratio. A .333 to 1 ratio means the rear wheel revolves 3 1/3 times for each engine revolution. (Power) In high gear one revolution of the rear wheels equals one revolution of the engine (Speed) and in over drive one revolution of the rear wheels equals 3/4 engine revolution thus (Economy) saving gas. My 2006 has the ratio stamped on the differential housing.
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Old 06-22-2015, 03:37 PM   #16
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Open drivers door. Look at tag, find axle code. Google the two letters for Ford axle ratios. Bingo...someone will say bit the previous owner may changed it. Well, that would be a bummer....
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Old 06-22-2015, 04:08 PM   #17
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Drive shaft turns 3.31 revs to the wheels one rev = 3.31:1 gear ratio.
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Old 06-22-2015, 04:14 PM   #18
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Quote:
Originally Posted by nicholasmadill View Post
Don't see it on my door sticker, I'll check the window sticker later this evening Attachment 185540Attachment 185541


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The sticker you posted says axle code BB which represents 3.73 ratio
That's why you're at a high or higher RPM in 5th gear then you would typically expect to be with a lower gear ratio.
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Old 06-22-2015, 05:18 PM   #19
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Quote:
Originally Posted by Diehard View Post
The sticker you posted says axle code BB which represents 3.73 ratio
That's why you're at a high or higher RPM in 5th gear then you would typically expect to be with a lower gear ratio.

Oh nice so I don't gotta think about changing the gears 😏


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Old 06-22-2015, 05:27 PM   #20
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Yeah I found the window sticker when I got home, it verified the 3.73 upgrade gear upgrade for $500


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