I have a 99 F150 4x4 with a 4.5in rough country lift. I replaced all ball joints and tie-rods and took it to be aligned at a very reputable shop. I have 35" Mickey mtz's. I drove for roughly 2500 miles and i happened to notice that the inside of both my front tires were worn down considerably. Outside looked fine. So i took it back and they rotated the tires and re-did the alignment. Again, i drove roughly 2000 miles and the inside of the front tires were worn down terribly. So in frustration i put my stock tires on and have driven for almost 6000 miles. The stock tires havent worn at all! Is the camber supposed to be set out further for the larger tires? Is there anything else that could be causing this because these tires arent cheap!

Thanks
Kris

 

your camber could be fine. taller should wear faster than the smaller.

now caster is alittle different. it measures the angle of the top ball joint to the bottom ball joint. if it's off, when you take turns it lookes like a camber issue, with tires angled. it puts more pressure on the inside tire(turning right, left inside suffers, turning left, right inside suffers, etc.).

is it more city of highway miles. and did they give you a print out of the alignment specs when they were done. (they should have). only other thing i can think of is control arm bushings, are they worn too much?

good luck.

 

I'd say mostly country and city driving. They did give me a printout but I just threw it away when they said everything was good to go. I assume the bushings are good as they had no play in them when I was putting the lift on. Only other thing I can think of is I have the torsion bars cranked almost all the way to level out the truck...

 

Do you have camber adjusters installed? You need them if you have your torsion bars are cranked almost all the way. I got them for my truck because it was chopping my front tires on the inside. There is no factory camber adjustment on these trucks... most parts stores have them, $60 I think.

 

makes sense also. that would affect caster and camber.

since you have the torsions cranked all the way, your pushing how close they can get to a factory setting. there just not able to get there without more adjustments.

 

i don't know about the caster and camber part of it, but when i had my torsion bars cranked all the way i was beating the crap out of my front end components. I don't recommend it.

 

My upper control arms have the cam bolts, I figured that was for adjusting the camber. But it is chopping the front inner tires as the front if he lugs are worn more than the back of each lug. What other camber kit is there?

 

If you have camber adjustment kit you will have an eccentric on all the bolts. Its just like a big washer with the hole offset. I can got take some pics if you want some, just ask.

I dont have mine cranked all the way, but it still didnt align very well with out them. Now I have them my new tires are not chopping at all

 

Yea, by cam bolt I meant it's a bolt with the offset washer. When you turn the bolt it moves the control arm in and out. Front and rear bolts on each control arm have them. Do think I need to look into a leveling kit so my torsion bars are cranked so much? But as far as the geometry, the lower control arm will still be in the same place cause the need for more camber

 

well, the leveling kit that i got was just aftermarket torsion keys. The way i see it the aftermarket keys just give you the ability to crank the torsion bars further. I had the torsion bars turned up all the way on the aftermarket keys and had basically no suspension up front. So now I have them turned all the way down which is basically the same height as having the stock ones turned up all the way. I don't know the suspension science behind it all, i just know the ride hights and quality of ride that i experienced at the different levels.

 

i still think its the caster by the way you explain the wear on the tires. would still have it aligned.

also i would get the level kit. your still twisting the bar but it changes the location of the key vs the bar. for me its worth it.