I don't agree with the 100% comment.Watch my video and Tom's video, we both use right at 7.5 seconds 0-30 mph, and I'm moving 1500lbs or so more weight.
JL

 

I think I may have watched your video JL, but could you post a link of it.

 

I think by "easier" phillips91 simply mean lower RPMs, less engine stress, and less fuel.

 

The turbos definitely help with the altitude which is another reason I bought a diesel. I saw someone saying their 5.4 gets 17.9mpg, and was thinking "not up here". This thing has a ton more power than my 5.4 F150 did, and gets better mileage too. My Fusion (car) is much quicker down in California. I'd expect the F250 to be the same down there, and just dump a lot more boost.

Ford would NEVER release something like that (towing charts) but I'm not going to ignite that argument...lol

 

<param name="movie" value="http://www.youtube.com/v/7rBE0-mrOro&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/7rBE0-mrOro&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed>
JL

 

I know that Lance Armstrong would pull me even if he were in 3rd gear because he makes more power...

 

lol...I hadn't got to your post when I made my last response.

 

That 97% of the newer ones only have the option of a 3.31 or 3.55 rear end. There is no 3.73 option for the 08-10 models, or the 2011's in the PSD and auto tranny. The only way you get the 3.55 rear end in the 6.7 is if you go 4X4, otherwise it's a 3.31. They can get away with the taller rear ends because of the power the trucks make.

 

I just used Lance Armstrong as an example because everyone knows his name. There is a larger gap in yours and Lance's bike riding skills than there is between the power of a v10 and a psd. Put you on the bike in 3rd gear and your wife on the one with the hill gear. I'm betting she gets it rolling easier than you do even though I assume your body generates more power than hers does. Or let me simplify it for you even more. Just forget the other bike rider. Can you start out just as easily and fast in 3rd as you can in 1st? Your body is generating the same power in both instances but the gearing drastically alters the amount you to put it to the ground.

Same with the wrench. If I give you a 6" ratchet and you tighten a bolt as tight as you can, do you think your wife can come along behind you with a 2' torque wrench with a 3' cheater bar on it and tighten it even tighter? In that instance, your body is the engine and the wrench is the gearing. It doesn't matter how much more power your body(or engine) generates than hers, she will tighten it tighter and easier because of the gearing(longer handle on the ratchet).

Once again, READ before replying. I said MOST of the psd's come with an auto and most of those have a 3.73 gear. That encompasses every super duty psd from 1999-now and not just the ones like YOUR truck. You are not the only one here and the 6.4/6.7 are not the only psd's that we are talking about.

Just flat wrong. They can go with a taller rear end because they changed the transmission ratios and 1st in the new 6 speed is a lot steeper than in the 5 speed. If you take a 5 speed with a 3.09 first gear and a 4.10 rear end you have a final drive ratio of 12.63. If you take a 6 speed with a 3.97 1st gear and a 3.31 rear end you have a final drive ratio of 13.14. So even though the rear end is taller with the 3.31, the final drive ratio is even steeper than the one with the 4.10 rear end.

 

I have one in my owners manual.

 

Or here:
https://www.fleet.ford.com/showroom/...ng/default.asp
JL

 

JL- I keep thinking of mine with a manual in it. With your's being an auto the tc will allow you to turn more rpm's at the same speed pulling out than a manual. When I pull out with my 5.4 and 7.3 both in 1st gear, the 7.3 gets the load moving a lot easier and pulls it faster until it has to shift to 2nd. Then my 5.4 pulls another 3k rpm in 1st and pulls ahead. If I pull out in 2nd gear in my 7.3 to simulate and automatics gearing, it's laughable how much slower it is off the line than my 5.4.

 

Well DUH everyone knows who he is... afterall, he IS the dude that walked on the moon!

Or was he the guy that sang "What a Wonderful World"? I keep getting those two Lances mixed up.

 

But the 6th gear in the 6 speed is much taller than than the 5th gear in the 5 speed. That means you'll need more power to keep it rolling down the road.

 

No it's not..... 5th gear in the 5 speed is a .71 and 6th in the 6 speed is a .67.... That means with the 3.31 instead of a 4.10 you are going to have a harder time pulling the same trailer up a hill in 6th gear than the 5 speed would in 5th. Final drive in 6th with a 3.31 is 2.22. Final drive in 5th(in the 5 speed) with a 4.10 is 2.91. That is why the 6 speed has a 5th gear of .86(instead of a 1.0 4th like the 5 speed). Final drive ratio with a 3.31 in 5th gear is 2.85, which is virtually the same as the 5 speed in OD.

What it boils down to is the 6 speed comes with a taller rear end and the same 6th gear so you can get better mpg's cruising, but it comes with the 2nd overdrive(5th gear) so you can downshift and haul stuff better, but still be in the equivalent of the 5 speeds OD. It comes with a much steeper 1st gear(and other tranny gears adjusted accordingly) so that you get the same pretty much the same final drive ratios as you had before.

Compare the final drive ratios with the 3.31 and 6 speed vs 3.73 and 5 speed. The 6 speed has the advantage pulling out and cruising in 6th, but the middle gears(the ones you will be towing with while cruising) are virtually identical.
6 speed
3.97=13.14
2.32=7.68
1.52=5.0
1.15=3.8
.86=2.85
.67=2.2

5 speed
3.11=11.6
2.22=8.3
1.55=6.2
1.1=3.73
.71=2.65