2018 v 2017 manual GT

[lockwood]

Given the extra power, why isn’t the 2018 GT substantially faster than the 2017 GT, with the same diff ratio? 0-60mph times seem very similar.
Our rhd and euro market cars have less power than the US cars. Our 2017 Gt’s get 410hp (306kw) and the 2018 450hp (339kw)

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[Al_5oh]

Its all about the MT82-D4 Gearbox.
The D4 is direct in 4th. The pre-2018 had direct in 5th.
This is why all the reviews complain about the over-tall, extra-long, gear ratios, and the reason it (the MY18+), is no faster than the old model.
The Auto box on the other hand, is substantially faster, due to the ten-speed always having the engine in its perfect rev's, power-band for max acceleration.
The diff ration for the Auto in the States is 1:3.55. The manual in the performance pack is a Torsen 1:3.77.
All export RHD drives come with the 3.55 diff, so the manual D4 gearbox is hobbled again.
I guess the only way to improve your manual car acceleration, would be to change the diff out to the spec of the Yankee cars.
Al.

 

[I Bleed Ford Blue]

Your close the manual PP cars get 3.73's not 3.77's

 

[BmacIL]

Because Ford made a decision to favor the A10 hard and hamper the manual cars with a garbage transmission ratio set with the D4. Even with 3.73 rear axle gears it does not feel nearly as strong as it is, or even stronger than the previous gen. I've already seen a couple of 2018 GT swaps to the Gen 2 MT82 with rave reviews on road and track, and I've also seen at least one with the D4 go to a 4.09 rear axle gear set just to get the final drives where they should be.

Because of all this, it's my opinion that if one wants a manual S550, get a 2015-2017. If you would consider the auto, the 10R80 is worth the goofy price of admission (front fascia).

 

[Silver Bullitt]

Here's why.

 

[DuRsT]

I'm seriously considering moving to the 4.09's in my M6.

Not sure if I would have to have Ford do it.

 

[Al_5oh]

Thanks for the correction IBFB. Brain fade. Its is a 1:3.73 ratio Torsen in the PP Stateside.
I'm wanting to drop the ratio in mine since I got it as well. Good feedback with the 4.09 number.
Are there any other factory gear sets between 3.73 and 4.09, that could fit?
I have also investigated the shortening effect of a 35 profile verses 40 profile tire aspect ratio.
Calculations have shown it drops 0.11, so the Aussie 3.55 goes to 3.66, and a 3.73 would be a 3.84.
I'm thinking the latter may be enough of a drop, without the full 4.09 treatment.

 

[DuRsT]

Thanks for the correction IBFB. Brain fade. Its is a 1:3.73 ratio Torsen in the PP Stateside.
I'm wanting to drop the ratio in mine since I got it as well. Good feedback with the 4.09 number.
Are there any other factory gear sets between 3.73 and 4.09, that could fit?
I have also investigated the shortening effect of a 35 profile verses 40 profile tire aspect ratio.
Calculations have shown it drops 0.11, so the Aussie 3.55 goes to 3.66, and a 3.73 would be a 3.84.
I'm thinking the latter may be enough of a drop, without the full 4.09 treatment.

I seriously doubt you would notice a difference of .11. Some people can’t tell the difference between 3.55 and 3.73.

 

[Al_5oh]

Agree with you DuRsT.
However, going from 3.55 to 3.84, with 0.18 from the 3.73 diff change-out, and the 0.11 from the tires, would give 0.29 shorter.
I would hope to feel that difference.
If not, on my other post, if there was another factory ratio between 3.73 and 4.09?

 

[I Bleed Ford Blue]

The last factory ratio is 3.73, the 4.09 is aftermarket made by ford but you can not get them factory installed. You can have the dealer install them or buy them and have another shop do the install. I do not know of any ratio between the two.

Before my mustang I had a F150 4x4 and the advice everyone gives in the truck world is you need to go at least two steps up or down in gear ratio changes to notice the difference to make it worth the expense. Swapping gears is a very detail oriented and precise job that is labor intensive. If you get it wrong you can burn up the gears in a heartbeat, hence the expense.

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