I have a 99 super cab 4x4 and 4 wheel abs. All stock under the engine! My front tires are scalloping (cupping) on the OUTSIDE edge only on both sides(just front)??? Just replaced the wheel bearings(both) and am going to get alignment. I need new tires bad so i wanted to fix this before i ruin the new ones?? any help please chris

 

Main reason for the problem is alignment.
That being said, other problems can casue the alignment to be out. Especially ball joints.

 

i have the same problems was told the ball joints and tie rods need to be done thats what threw it out of alignment so get it fixed before the new tires

 

Bad shocks and struts could also cause this.

 

i would lay money on the ball joints on being loose

ive done almost a set of ball joints a day for like the last week on rangers, explorers, and f150s

 

I kind of checked my ball joints out when i changed my wheel bearings last weekend but they seemed pretty tight?? i think im gonna look at the ball joints though ( about 60 for whole a arm (moog) )
any other thoughts are appreciated thanks alot chris

 

Do you have your torsion bars cranked? If so I've heard on some trucks with them cranked up too much it can throw the camber out of adjustment so far an aligment alone will not fix it and a camber kit has to be installed to fix it.

 

If you lifted the front the outside of you tires would wear without proper alignment just as lowering can wear the inside of tires without proper alignment. A camber kit may be needed if a regular alignment doesn't fix the problem.

 

thanks alot to everyone who helped. i did crank the torsion bars a little but not a lot. also put on new shocks all around. i got the tires on ( nitto grapplers SWEET) and they alligned it again and it seems fine so i guess well wait and see what happens in a few miles !!! thanks again chris

 

ITs been about 3000 miles and the allignment guy i took to never said anything about any parts i should replace (ball joints, tie rods, etc, ? ) I now have a little vibration in front at about 65 - 72 ?? Any suggestions or should i try new allignment guy? thanks chris

 

If your vibration comes and goes at certain speeds it is your tire balance.

The guy who did your alignment would have checked your whole front end before he did the alignment. His shop would not waste the opportunity to sell more parts and labor if you needed it.