Gas vs PSD
Posting Guru
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From: Sunny, Snowy, CO
I believe "Scorpion" was their developmental code-name like Froyo is the code-name for the 2.2 Android Operating system on the phones.
Postmaster
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From: Rogersville, TN
If you happen to have a personal problem with me, take it somewhere else. Or, you can PM me and I'll give you my address so we can discuss things in person at a time of your choosing. I'm done responding to your postings, so from this point forward, don't respond to mine, even in the third person like you like to do.
Posting Guru
Joined: Aug 2008
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From: Sunny, Snowy, CO
Yep, I see that...they seem to have stopped at job 3 in the 08's though...don't know why. I have the 3.55 and would be just fine with the 3.31 as far as I can tell.
Thread Starter
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Modular motor junkie
Joined: May 2009
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From: Texas
What I read when they did it is that the 6.4 was not getting the mileage they thought it needed to, so they changed it along the way.
Tom, you truck is a job 2? I know it has the 3.73s.
Tom, you truck is a job 2? I know it has the 3.73s.
Super Moderator
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From: Isanti, MN
Mine's a Job 3, built in March of 2008 if I remember right. The 2009 trucks were changed to only offer 3.31 and 3.55 gears.
3.31 gears would put it at a 12% torque disadvantage in any particular gear compared to the 3.73s, and 3.55s would be at less than a 5% disadvantage. I can see either ratio towing lots of weight without any problems.
Although it's kind of neat being able to climb 3-4% grades on the highway at 19,500 lbs in overdrive, so I don't mind my 3.73s!
3.31 gears would put it at a 12% torque disadvantage in any particular gear compared to the 3.73s, and 3.55s would be at less than a 5% disadvantage. I can see either ratio towing lots of weight without any problems.
Although it's kind of neat being able to climb 3-4% grades on the highway at 19,500 lbs in overdrive, so I don't mind my 3.73s!
Postmaster
Joined: Apr 2006
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From: CA Bay Area
I am pretty annoyed with my PS screaming at 3000 rpm doing 75 mph
The only thing that sweetens the situation is the fact that even with 10 k empty weight and high differential ratio I still get better mpg than Bill
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Postmaster
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From: Rogersville, TN
What rear end does yours have? Turning those rpm's at that speed sounds like at least a 4.30 to me. Mine has a 4.10 and is turning ~2,700 at 75 mph.
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From: WV
I think I hit 3k right around 80 mph... But I don't trust a tach that much, I would have to hit the button on the dash to check my true RPM.
Elder User
Joined: May 2010
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From: WV
Hummm.... I pretty sure that is over your towing capacity for that truck, I don't have the charts for an '08 on hand. That is well into the DRW range. You probably don't care much, but if you where in an accident, your insurance company may care.
Elder User
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From: WV
Nope, that's what I thought to. But apparently Ford owns that name, and according to the chief engineer, they have quite a bit invested in that name.
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From: Isanti, MN
Postmaster
Joined: Apr 2008
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From: Rogersville, TN
Edit-Tom beat me to it lol.
Elder User
Joined: May 2010
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From: WV
ahhh... I get it.
