That “thud” is not normal.
And it’s a sign that the transmission is responding slowly.
The slow response could be from worn out fluid (low viscosity as a result of shear) or a worn out valve body that can’t generate proper hydraulic (line) pressure to engage the gears.
I would change the fluid. A cooler line exchange. AKA Gibbons flush. Use a good quality fluid that meets JWS-3309.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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