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Discussion Starter #1 (Edited)
We bought our GT 'vert last summer, and I knew it was a Premium --- but I also figured it had the stock/base axle ratio (3.15?).
I was putting our new insurance card in the glove box tonight and took a (good/better/first/detailed -- feel free to pick one!) look at the window sticker. I was surprised (and yes, I know I should not have been!!) to see our GT was equipped with the 3.55 rear axle ratio!! Congrats to the person who ordered this car for inventory...thank you, thank you, thank you!:dance: I did not even know that the 3.55 was an available option for a non PP 'vert!

I thought that our GT turned a few more rpm's at highway speed than I was expecting it to, but just figured that 6th gear in the A6 was not as deep as our C6, which turned a lot fewer rpm's at the same speeds.
I am VERY happy and I now know why first and second gear are so much FUN! More than willing to give up a bit of mpg for this kind of thrust!
 

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The autos come standard with 3.15's and 3.55's are an option.
 

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Happy coincidence! Don't go buy an F150 without looking that over tho, 90% of the new ones are all real "high" gears like 3.15 or 3.31. in a truck, IMO that's a big no-no
 

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Nice! I made sure to get the 3.55's in my GT/CS and I'm glad I did. As far as mileage goes I'm getting 22mpg which is better than I was expecting (not that I care).
 

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Discussion Starter #5
Happy coincidence! Don't go buy an F150 without looking that over tho, 90% of the new ones are all real "high" gears like 3.15 or 3.31. in a truck, IMO that's a big no-no
My last two F 150's were Max Tow Ecoboosts -- 3.73 gears and a 11,200 pound towing capacity. Both would tow our 7,000 pound TT like it was barely there.
Towing up to the Lincoln tunnel, and one of the longest, steepest highway grades in the nation (just outside of Denver) we did a solid 65 mph in 4th gear at 2,900 rpm and passed every other truck that was towing -- they sounded like they were in second gear near redline.
 

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My last two F 150's were Max Tow Ecoboosts -- 3.73 gears and a 11,200 pound towing capacity. Both would tow our 7,000 pound TT like it was barely there.
Towing up to the Lincoln tunnel, and one of the longest, steepest highway grades in the nation (just outside of Denver) we did a solid 65 mph in 4th gear at 2,900 rpm and passed every other truck that was towing -- they sounded like they were in second gear near redline.
:lol:
nice dude, exactly! that's just awesome, not to thread jack here, but what do you think of the ecoboost F150? worth getting over the famous 5.0L in our stangs?
 

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Discussion Starter #7
:lol:
nice dude, exactly! that's just awesome, not to thread jack here, but what do you think of the ecoboost F150? worth getting over the famous 5.0L in our stangs?
I have not towed with the new 2.7, but have about 45,000 miles towing with the 3.5.
This engine is, without a doubt the best towing combination you can currently buy in a half ton. It even crushes the Ram EcoDiesel for capability.
When you are not towing, this engine will stay in 6th gear on the highway regardless of the grade, and when towing 8,500 pounds will pull almost any grade in 4th gear at 2,900 rpm....nice and quiet while doing so too.
The 5.0 is a decent towing engine, the EB is a GREAT towing engine. When you look at an engine where the torque peak is at 4,700 rpm (5.0) -- vs -- an engine where the torque peak is at 1,900 (the 3.5 EB), and you can see why the EB tows so well.
Our first truck was the 5.4 -- and towing up grades at 4,000 rpm was a verbal assault. I am sure the 5.0 sounds better at 4,000 rpm ---- but you simply cannot beat the EB for towing -- it's simply effortless.
If you're thinking about getting a truck, you should spend some time over on the F 150 forum (I was over there as Adobe 2X). There are more 5.0 -- vs -- EB threads there than there are 5.0 -- vs -- 3.7 threads here.
 

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Nice! I Would've liked to have 3.55's in my GT but 3.73's aren't a bad 2nd choice.
 

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Happy coincidence! Don't go buy an F150 without looking that over tho, 90% of the new ones are all real "high" gears like 3.15 or 3.31. in a truck, IMO that's a big no-no
Yes, they're a no-no if you want reasonable gas mileage. However, if you want to step on the pedal and feel like you got your money's worth, it's worth it. Holy hell is it worth it.
 

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3.73 v 3.55

Nice! I Would've liked to have 3.55's in my GT but 3.73's aren't a bad 2nd choice.
I assume you have the PP option with the 3.73s, which I have also. If so, you get quite a few things with the PP (along with the 3,73s) that you do not have with the regular GT.
 

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Discussion Starter #11
I assume you have the PP option with the 3.73s, which I have also. If so, you get quite a few things with the PP (along with the 3,73s) that you do not have with the regular GT.
For some reason, I don't think you could get the PP in the convertible in the 2015's. Then in 2016, you could. For a nice compromise, and the highest you could get for 2015, I still am happy with my 3.55's.
 

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For some reason, I don't think you could get the PP in the convertible in the 2015's. Then in 2016, you could. For a nice compromise, and the highest you could get for 2015, I still am happy with my 3.55's.
I could live with 3.55s also, maybe even prefer them over the 3.73s, but no problem either way. You may be right about the PP not being available in the vert.
 

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I prefer my 3.15's in my auto since they're better for drag racing than the 3.55's.
 

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Discussion Starter #15
I prefer my 3.15's in my auto since they're better for drag racing than the 3.55's.

Really? I would think that the 3.55's 60 foot times would negate any extra shifting they might require at the top end.
How much of an advantage do you believe that the 3.15's are? I don't think that I've ever heard that lower (numerically) gears are better for drag racing, providing you can use all of the available acceleration traction-wise. 4.11's seem to be popular at the drag strip just for that reason.......
 

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Really? I would think that the 3.55's 60 foot times would negate any extra shifting they might require at the top end.
How much of an advantage do you believe that the 3.15's are? I don't think that I've ever heard that lower (numerically) gears are better for drag racing, providing you can use all of the available acceleration traction-wise. 4.11's seem to be popular at the drag strip just for that reason.......
The difference between 3.15's and 3.55's in the 60' will be nearly identical. A converter will make a difference there. But the 3.55's will require a shift into 4th just before the end of the stripe dropping you out of your power band as you cross. That's where 3.15's have a distinct advantage. There's a list on mustang6g and the 3.15's hold the edge by a pretty good amount there.

I had my 2011 auto running consistant low 11's N/A with my stock 3.15's which is why I wanted those gears in my 2015.

4.11 gears are very old school and times have changed. No need for steep gearing in these cars anymore since the 6R80 has steep gearing from the factory.
 

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3.15 on strip

Really? I would think that the 3.55's 60 foot times would negate any extra shifting they might require at the top end.
How much of an advantage do you believe that the 3.15's are? I don't think that I've ever heard that lower (numerically) gears are better for drag racing, providing you can use all of the available acceleration traction-wise. 4.11's seem to be popular at the drag strip just for that reason.......
agree with you regarding the 3.15s on the strip.I'd. prefer the 3.55s
 

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Discussion Starter #18
The difference between 3.15's and 3.55's in the 60' will be nearly identical. A converter will make a difference there. But the 3.55's will require a shift into 4th just before the end of the stripe dropping you out of your power band as you cross. That's where 3.15's have a distinct advantage. There's a list on mustang6g and the 3.15's hold the edge by a pretty good amount there.

I had my 2011 auto running consistant low 11's N/A with my stock 3.15's which is why I wanted those gears in my 2015.

4.11 gears are very old school and times have changed. No need for steep gearing in these cars anymore since the 6R80 has steep gearing from the factory.
That surprises me....have to do more research here on this issue.....that super low first gear in the Auto transmission probably makes the 60 ft times as close as they are....
I do know that around town, my 3.55's seem to shift out of first gear before I am even across the crosswalk.....
 

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When the 2011 cars first rolled out guys were stuffing 4.10's in because, well, that was always the gear of choice for the autos. As time when on and more info was being gathered everyone starting realizing the error in their ways.

Just imagine being at the strip and having your car shift into 2nd gear before you're even at the 60' mark. It was and still is happening with the steeper gearing in the autos.

Now around town and on the street just for overall fun some would prefer 3.55's.
 

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Discussion Starter #20
When the 2011 cars first rolled out guys were stuffing 4.10's in because, well, that was always the gear of choice for the autos. As time when on and more info was being gathered everyone starting realizing the error in their ways.

Just imagine being at the strip and having your car shift into 2nd gear before you're even at the 60' mark. It was and still is happening with the steeper gearing in the autos.

Now around town and on the street just for overall fun some would prefer 3.55's.
That makes sense if the 3.55's are shifting before the 60 foot mark AND just before the lights............but in town, yes -- if you put your foot into it and keep it in first gear (or just put it in Sport mode), first and second gears are all kind of fun getting up to the speed limit.
 
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