Mine also does that, but I am not worried about that little flaw. I am worried about the clunking downshifting and the bad flare when going from about 30 mph to the next gear.

DK

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1983 300sd 253,000 + 13,000 (10,000+ on veggie and biodiesel)= 266,000
1983 300sd 390,000 (Leaky windshield seal) Known to me as the shower car. Parts car now!
1 junk 300sd Watch out for the skunk that lives underneith it!