Allignment Issues...for 300k miles....

[Jayfarmlaw]

99 F-250, 4x4, 7.3, Auto, Hayspike bed,310,000 miles. My problem is with the allignment. For 300,000+ miles now I keep eating the inside front edges of the tires. The last set wore out in less than 40,000 miles with regular rotations and allignment checks. Every time the allignment has been set, (at least once a year) all front end parts check out fine. Ball joints have been replaced, all else is stock.

This is a farm/pasture/ feed/ trailer puller so it does not stay on paved roads. I know that is a problem but is there any allignment settings available that will cause the front tires to wear evenly? I just put a new set of more agressive tires on and I know they will wear faster than a standard all terrain tire with it set like it is. At $800 bucks, I would like to get a little more life out ofe them.

Thanks in advance for your response,

Jay

[icysmooth]

If you're chewing up the insides of your tires,look for this-when you stand in front of the truck(at least 15 feet away),does it look like your tires are leaning in at the top and out at the bottom?
Easy fix-you may want to find an alignment shop who may be more familiar with ford's front ends(not bustin' no chops here)
But if that's what you have, then the align shop can measure and replace angled cones inside ball joint brackets on diff to straighten tires back out and make them last.
Mine had that problem too-now tires last great!