He explained that the vehicle vibrates only in reverse. This seems like slippage band is the symptom. Since you are going to change the fluid, I would also replace the filter.
Make sure to examine the old fluid and filter for debris. Grey matter is normal to find. But, not an excessive amount. If you see metal shavings, this would be a cause for concern. Nevertheless, if the transmission ceases to vibrate with the new fluid and filter, then it'll be fine
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