1993 Lexus LS 400

Noises problem
1993 Lexus LS 400 108000 miles

I have a 1993 Lexus LS400. I just got the transmission done on it and it ran fine for a week. This afternoon when I went to lunch the car drove fine, but when I cut it off it started knocking and it wont go away. It doesnt knock when I drive, just when the car is turned off. What can it be?
April 4, 2008.

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