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The shift from 4th to 5th in auto is a big "drop" in rpm. The engine rpm does not fall quick enough for the shift or there is a slight over-run therefore you may feel a lurch or hear a slight grind as 5th is engaged because the engine is at too high of an rpm for the wheel speed. Usually I find this happens only at high rpms in 4th-5th and full throttle.
I've only noticed it after going FI because NA it took years to pull entirely through 4th.
What I've found that prevents the grind would be to get off the throttle when shifting from 4th to 5th and then getting back on when the gear engages.
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