Join Date: Feb 2018
Location: Fort Worth Texas
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'The standard movements we all use to check the swing arm focus on the ball joint.'
Or the 12 and 6 thing. The 3 and 9 are for tie ends and what you just found bad, or LCA bushings gone away.
Many brand new tires will fall over when fresh installed on wheels, they are ballooned out when off the car. Means nothing. Just sayin'.
Visible tread wear that is wonky, that's another thing. FYI, most cars on the planet will show front tire wear on the edges with high use, it comes from the way MacPherson struts angle the tire as they turn to maintain ackerman. Even if the suspension and align is fine. Why when tires are dead you simply change tires to often get car back to tracking fine before going crazy getting car re-aligned, a definite mistake with worn tires.
If you change one front you should change the other. Driving with one used tire on front is a mistake, the difference in rollout cycles the spider gears in diff to more wear and also can cause torque breakaway issues in heavy rain. Put any used ones on the back instead. On FWD cars 90% of all driving sureness comes from the front only except in ice where the rear then comes into play. Otherwise the rear simply tracks back in line with the front like a semi-trailer does with its' tractor after a corner. The rear really adds little but one effect all FWD cars do that I never see mentioned anywhere is that rear tires wear whoppingly out of round due to oscillation at highway speed, there is no longer any rear end weight to damp it out like RWD cars had. Meaning, if you rotate tires you are adding another problem to the front when deeper in tire life, the out of round back tire then acts wonky up front and worse the older the tires are. You absolutely cannot rebalance to cure an out of round condition and why I buy tires in pairs only to put them up front and the old fronts which are still round then go to the back. I NEVER rotate yet I get rated mileage almost all the time.
No tire shop on the planet acknowledges that last part but every FWD car I've ever owned did it. They don't say because rotation causes the whole set of 4 to go bad faster than they do in pairs and it sells more tires as many think you change all 4 at once and a big money waster.