2021 GMC Sierra trans shudder?

LaxxbrahhhhB to Mechanic Advice@gearhead.townEnglish · 10 months ago

2021 Sierra 5.3L V8 8 Speed, 56k miles. I had the transmission fluid and transmission filter swapped out at 48k miles in June by a Chevy dealer.

Lately while driving at highway-ish speed (40+ mph) with low power input, I have an intermittent feeling like I’m going over a rumble strip. The vibration will always be about 1500 RPM and go away if I let off power or accelerate. It’s not severe but I don’t think I’ve noticed it in the 2+ years I have had the vehicle.

Also, when coming to a stop I can feel the transmission shifting down pretty aggressively. The faster I stop the harder the shifts.

So, is this something to be concerned about and if so, what action can I take?

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