might be time to give it a fluid and filter change. Then, look carefully in the pan and also in the filter for particulates. Look for flakes of friction material in the filter and steel fines in the pan. Better yet, snap a few pictures and post them here.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.