Very early production steamer and diesels have bushings but not after those. Definitely not a 336. Other things can contribute to wheel wobble as mentioned. Even drivers out of quarter can give that illusion while running. To test for bushing/frame wear, turn the engine over, pinch across a pair of drivers with your thumb and index finger and try to move them diagonally front-back, up-down. Shouldn't feel a lot of travel. Try it on several engines for comparison.
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