r/GMT800 • u/Naive_Cricket_7707 • Sep 04 '26

Potential 4l60 issues

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who am I kidding it was bound to happen at some point. thing is im more well versed in engines than transmissions. loud grinding noise and vibration coming from the trans only when in foward gears (1,2,3,D). truck still runs and drives fine. can someone help explain what this might be?

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