You said it "bucking and kicking" in the first post but now you are saying clunking. There is a difference, too little weight on the pin will give a miserable ride. Clunking is something loose. Mount a Gopro in the bed and take it for a drive.
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2000 Sprinter 275BH 5th
2003 F-250 6.0 SB CC 4X4 Lariat
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