No, I don't think it would be bad to change the fluid.. Actually, I would suggest that you do. I would change the fluid, and the filter. I think you would benefit from that even if it doesn't fix your "thump" noise that you're having. I'm sure it would help firm up your shifts quite a bit, and probably just clean up the general "sloppy performance" that transmissions usually end up developing after the fluid becomes so used.
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great thanks for the reply