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2004 expy - P to E tires

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Old Sep 2, 2010 | 11:37 AM
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2004 expy - P to E tires

We have a 2004 Expedition EB 4x4. We had P rated tires on it but then switched to E rated which has the potential for 80psi.

I was recently told that the rim/wheel may not be able to handle that amount of pressure. I was also told that the pressure rating should be stamped on the inside of the rim/wheel but I'd like to avoid going up to the shop and removing it just to check - anyone here know the rim/wheel specs?

 
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Old Sep 2, 2010 | 03:44 PM
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Do you intend to set the pressure that high? 80 psi is going to make it ride like the Flintstones car. Your Expy can't handle the wieght 80 psi E rated tires can carry anyway, so why be concerned? I have yet to run my D rated tires over 50 psi.

The wheel can handle the pressure. What it is not designed to do is carry the 3000 lbs plus that the tires can each handle. How you would get 6000 lbs on the back tires would also interest me, pics please

Someone has you needlessly worried, unless you had some pretty wild plans for your truck.
 
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Old Sep 2, 2010 | 05:57 PM
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Good point! I've got the cold inflation chart from the Hankook and you're right. We're towing a travel trailer with a dry tongue weight of 650 so unless the wife decides to bring a few thousand pounds of stuff and figures a way to get it on the tongue we're good(; Thanks for replying.
 
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Old Sep 3, 2010 | 07:15 AM
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Even with a thousand pounds of gear on that tongue, and another thousand in the extreme rear of the expy, you are still way under the limit of LRE tires.
Enjoy your new tires, play with the pressures a little bit, and don't worry about it. You are covered.
 
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Old Sep 3, 2010 | 08:37 AM
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Please let us know how this worked out after your 1st "towing" trip.
 
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Old Oct 10, 2010 | 12:54 PM
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The TT towed fine when it was dry from the dealer. Once I loaded it up I maxed out the Expedition and I'm now looking at trucks. Wish I could say one way or the other if the tires really helped or not.

As a daily driver the tires didn't change the feel. I figured it would ride much more rough but it was the same - it's never really been a smooth SUV.
 
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Old Oct 10, 2010 | 03:26 PM
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It is a common misconception that E rated tires automatically have a harsher ride. They only have a harsher ride if you inflate them beyond the lesser tire being compared.

Having a 3/4 or 1 ton truck is the correct way to tow. People get away with less all the time but there is no substitute for a purpose built tow rig. The unfortunate side is that you now have a bumper pull trailer, and no matter what you do, they are no fun to pull. Behind a dually pick-up they do well, otherwise I despise bumper pull trailers. By far the best way to go is a gooseneck or fifth wheel that puts the load directly above the rear axle.
 
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Old Oct 10, 2010 | 04:40 PM
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Originally Posted by Big Greenie
Having a 3/4 or 1 ton truck is the correct way to tow. People get away with less all the time but there is no substitute for a purpose built tow rig.
True as that might be, for those that don't have the 3/4 or 1-ton vehicles, such as us Expy and Navi owners; you can at least prolong the life of your tranny by turning off the OD when towing up or down steep hills.
 
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Old Oct 10, 2010 | 06:42 PM
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Originally Posted by alloro
True as that might be, for those that don't have the 3/4 or 1-ton vehicles, such as us Expy and Navi owners; you can at least prolong the life of your tranny by turning off the OD when towing up or down steep hills.
Still casting that stone are we?
 
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Old Oct 10, 2010 | 09:48 PM
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Originally Posted by Big Greenie
Still casting that stone are we?
Nope, just educating the masses!
 
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Old Oct 11, 2010 | 08:48 AM
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Originally Posted by alloro
Nope, just educating the masses!
In order to "educate" you should use FACTS, not internet myths and incorrect opinions.
 
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Old Oct 11, 2010 | 11:17 AM
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Originally Posted by Big Greenie
In order to "educate" you should use FACTS, not internet myths and incorrect opinions.
It's good to know that you've finally learned to talk the talk. Now if I can only get you to learn how to walk the walk!
 
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Old Oct 11, 2010 | 02:37 PM
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It's been a long time since I opened up the manual so maybe I'm wrong, but I thought i read to hit the O/D switch whenever the Expedition was struggling to keep a gear. Normally that happened to us while towing on larger hills like on our trip out East to PA and NY over the Summer which is when I'd lock it out.

I don't have a truck yet so this coming wknd I'll still be following that on our way up to Northern MI.
 
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Old Oct 11, 2010 | 04:32 PM
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Originally Posted by mister_d
It's been a long time since I opened up the manual so maybe I'm wrong, but I thought i read to hit the O/D switch whenever the Expedition was struggling to keep a gear. Normally that happened to us while towing on larger hills like on our trip out East to PA and NY over the Summer which is when I'd lock it out.
You're correct, that's what it says. Big Greenie and I have been going back and forth on this issue. He doesn't agree that the OD should be turned off because the owners manual doesn't spell it out in plain English by stating straight up "Turn off the OD when towing". According to him, placing the shifter in D is what he considers to be Drive, whether or not you've pushed the little switch at the end of the shifter handle is irrelevant. I on the other hand, state that it's not just a D but a D within a circle to indicate both an O and a D for the overdrive. Pushing the button at the end of the shifter disables the OD and gives you just D (Drive).
 
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Old Oct 11, 2010 | 06:23 PM
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The purpose of disabling the OD is to keep the trans from shifting back and forth. Fords website states to leave the trans in OD unless you have gear hunting.

It is an argument over semantics. Nowhere in the manual does it give the advice alloro would like you to believe.

My experience is that the trans will downshift to third, lock the converotr and tow all on its own. If it doesn't, lock the OD out. Using the button to drop a gear enhancing engine braking is also a good diea. I drive in the mountains and I do this daily, often dropping to 2nd gear to avoid over using the brakes.

The myth is that you could damage the transmission if you do not disengage the OD. ONLY if it is hunting for gears, otherwise there is no durability issue which is the implication IMO. There is no transmission durability issue if you tow in OD.
 
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