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F250 4X4 Tire Pressure and Uncontrolable Shaking

My brother works for a company where he is required to drive off road in very rough conditions. He's been issued an F250 4X4 and told to run 80 lbs of air in the tires. 80lbs results in an extremely rough ride, so he logically pulled air presuure down to 38 lbs. When tire pressure is lowered and a slight bump encountered at highway speed the front end starts shaking uncontrolably and causes the vehicle to veer to the left. This is extremely dangerous. Such that a fellow employee riding with him when he experienced the shaking and veering left now refuses to ride in the vehicle.When he's taken it in and told the mechanic of what he's experienced, they tell him the tires being underinflated causes the truck to react as he describes.

The company policy requires the use of seat belts which ordinarily would not be a problem, but when using them combined with such a rough ride in off road conditions due to the tire pressure makes the working conditions for him very uncomfortable. My brother is in his 50's and values his job.... doesn't want to make waves, but this has him in a very difficult situation.

My brother is a very special person and I would like to help him find a solution to his problem. Wondering if anyone else has encountered the problem and what they have found as a remedy. All responses would be appreciated.

NJ

Reply to
NJ
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What size are the tires?

Spdloader

Reply to
Spdloader

Not sure...I"ll check and post later...thanks for the feedback.

NJ

Reply to
NJ

Correction on earlier post... tire pressure was lowered to 45lb instead of

38...

NJ

Reply to
NJ

NJ - You don't say how many miles are on the vehicle, but I have a 1995 w/over 200k miles on it... my owners manual says front tires should be inflated to 55lbs, and the rear to 80lbs, and I've never experienced the behavior you describe. Your brothers company truck could have some worn front end suspension parts as well, in combination with the underinflated tires. Maybe he could ask to use a different truck for a couple of days, just to see how it compares to the one he has now... Food for thought...

Reply to
websurfer

From the sounds of it, those are load range E tires. He should be running those about 55 when unloaded. Will have to bump up a bit if hauling a payload. The main factor here on pressure is load range of tires and what you are hauling. If I had those on my F150, I would run them at about 50. My load range c's are run at 40 and if I had LR d's I would run them about 45 on my F150 unloaded.

Reply to
Marlin Singer

Didn't we just have this problem about 6 months ago on a motor home? Seems it was related to alignment, but I'm a bit foggy about it.

CJB

Reply to
CJB

What year F250? Stock sized tires?

Reply to
Matt Macchiarolo
2005 and stock tires...

Has been in the shop and they have told him the shaking is due to tire not being inflated to 80 lbs...

Thanks for the response..

NJ

Reply to
NJ

My 2002 requires 70 lbs rear, 55 lbs front for stock tires at full payload. Look on the inside of the fuel filler for air pressure recommendations.

55lbs all around is probably sufficient for no payload driving.
Reply to
Matt Macchiarolo

On Thu, 08 Dec 2005 20:53:17 -0600, NJ rearranged some electrons to form:

I hate to be obvious, but have you checked the manufacture's recommended inflation? Where did you get the figure of 38psi? Is that what the tag on the truck says?

Reply to
David M

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