what do i look for i get a shake on the left side when i drive over 50 mile on 1990 Toyota Land Cruiser

1989 Toyota land cruiser

Asked by for the 1990 Toyota Land Cruiser
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First check tire condition. Is the threads even, is it worn? Also have your wheels balanced. Second check your steering and suspension components for looseness or worn bearings.
thank u i will check, all areas that u listed