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  #1  
Old 09-06-2011, 06:12 PM
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Air pressure on F-250

The sticker in the door jamb says 55 psi front and 80 psi rear. This strikes me as pretty high. The tires say 80 psi max. I figure you need those pressures to achieve the max GVW. Would it be reasonable to run them lower provided you don't need to haul 1500 lbs?

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  #2  
Old 09-06-2011, 06:54 PM
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You could but I run 80 all around my excursion
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  #3  
Old 09-06-2011, 08:13 PM
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Sounds about right, e rated tires run a lot of PSI.
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  #4  
Old 09-06-2011, 08:43 PM
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If you run 80 psi with an empty bed you will wear your tires in the middle and have unsafe handling. In my diesel F350's with utility beds and a full complement of tools and parts I run about 60 psi in the rear and 50 in the front with load range E tires. At about 8500 lbs total weight this seems to give good tire wear and as good a ride as can be expected from an F350 4x4. If I am going to get a load of firewood or something heavy I will air up the rears to 80 psi for the duration, then back to 60 psi. I have never found much reason to vary the pressure in the front tires as the pretty much carry a constant load. Aklim- I don't know how you can stand 80 psi all the way around in an Excursion!! On mine I go 50 all the way around and it still bounces on the slightest bump. You must have smooth roads where you live!
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  #5  
Old 09-06-2011, 09:28 PM
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Everything you want to know about tire pressure:

http://www.goodyear.com/truck/pdf/da...dInflation.pdf
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  #6  
Old 09-06-2011, 09:57 PM
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Quote:
Originally Posted by kerry View Post
Everything you want to know about tire pressure:

http://www.goodyear.com/truck/pdf/da...dInflation.pdf
Your link got truncated...

The tires on my truck take 65 PSI so that's where I run them. I don't drive it much but when I do, I'm usually hauling something big or towing something heavy.
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  #7  
Old 09-06-2011, 10:06 PM
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Try the pdf again
Attached Files
File Type: pdf loadInflation-1.pdf (263.6 KB, 99 views)
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  #8  
Old 09-06-2011, 10:35 PM
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Quote:
Originally Posted by 10fords View Post
You must have smooth roads where you live!
And then you woke up. Not a chance. My old springs used to be much softer but I changed to F350 springs. The soft springs were too squishy and with the F350 4 inch blocks in the back, the truck does sit higher. Bilstein shocks. However, I have Michelins which are WAY better than the Firestone stuff that I had.
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  #9  
Old 09-07-2011, 07:58 AM
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I run about 65 front and 70 rear on my 2000 Excursion. Never know what kind of load I will have on a given day. Yeah, I get beat to death with the high pressure. The truck tends to wander and dart around with the fronts up that high. On the plus side, the fuel economy is better with the harder tire. With an 8,000 lb flying brick, you do what you can to increase the economy.
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  #10  
Old 09-07-2011, 08:02 AM
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Quote:
Originally Posted by BobK View Post
I run about 65 front and 70 rear on my 2000 Excursion. Never know what kind of load I will have on a given day. Yeah, I get beat to death with the high pressure. The truck tends to wander and dart around with the fronts up that high. On the plus side, the fuel economy is better with the harder tire. With an 8,000 lb flying brick, you do what you can to increase the economy.
Unfortunately, Landyot doesn't make his radius rods anymore which does help stability and wander. Checked your steering box yet? I think there is an adjustment in it.
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  #11  
Old 09-07-2011, 08:16 AM
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yeah, it has an adjustment just like a Benz. I just hate to twist on the screw if I can help it. From what I hear, the reason most steering boxes get sloppy is that the bushings at the end of the shafts wear and the adjustment is only a bandaid. One of these days I'm gonna buy a steering box for a 126 from a pick n pull and learn to rebuild them.
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  #12  
Old 09-07-2011, 08:20 AM
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Originally Posted by BobK View Post
yeah, it has an adjustment just like a Benz. I just hate to twist on the screw if I can help it. From what I hear, the reason most steering boxes get sloppy is that the bushings at the end of the shafts wear and the adjustment is only a bandaid. One of these days I'm gonna buy a steering box for a 126 from a pick n pull and learn to rebuild them.
I'm not sure about that. Some have said that it cured the problem. All it needed was a quarter turn.
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99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
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03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow
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  #13  
Old 09-07-2011, 01:42 PM
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Quote:
Originally Posted by 10fords View Post
If you run 80 psi with an empty bed you will wear your tires in the middle and have unsafe handling. In my diesel F350's with utility beds and a full complement of tools and parts I run about 60 psi in the rear and 50 in the front with load range E tires. At about 8500 lbs total weight this seems to give good tire wear and as good a ride as can be expected from an F350 4x4. If I am going to get a load of firewood or something heavy I will air up the rears to 80 psi for the duration, then back to 60 psi. I have never found much reason to vary the pressure in the front tires as the pretty much carry a constant load. Aklim- I don't know how you can stand 80 psi all the way around in an Excursion!! On mine I go 50 all the way around and it still bounces on the slightest bump. You must have smooth roads where you live!
I basically do the same, 50psi/front and 65psi/rear. I only raise rear tire pressure with a heavy payload. Also if you offroad in sand or mud the lower pressure helps.
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  #14  
Old 09-07-2011, 02:07 PM
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Quote:
Originally Posted by BobK View Post
yeah, it has an adjustment just like a Benz. I just hate to twist on the screw if I can help it. From what I hear, the reason most steering boxes get sloppy is that the bushings at the end of the shafts wear and the adjustment is only a bandaid. One of these days I'm gonna buy a steering box for a 126 from a pick n pull and learn to rebuild them.

In the 170,000 odd miles I've driven, I've only replaced one radius arm that got sloppy. That and adjusting the steering box has done wonders for the highway driving experience.

It literally takes seconds to adjust it. Just make sure that the wheel is perfectly straight when you do it. There's a "hump" in the mechanism at center to take the slop out of it when steering down a long straight. Screw the adjuster down until it just bottoms then back slightly.

If you tighten it with the wheel turned, it'll bind when to turn back towards center.

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