Just wondering if anyone else had this issue before. When I first get up in my truck and plant my ass on the drivers seat, i hear a loud clunk which sounds like its coming from underneath the truck, not the seat itself. I tried standing on the side step and rocking the truck but couldnt reproduce the sound. Could this be a suspension issue?

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2007 Ford Ranger Sport 4X4

Mabe the cab floor is rusted away and your weight is causing it to be pushed down onto something, roll under it and look.

Is the parking brake on when this happens by any chance? Mine will sometimes move slightly when I get in my truck making a funny clunk sound as the truck moves a 1/16".

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2010 Ranger XL 2.3L 5 Spd 3.73:1 Bone Stock
2013 Scion FR-S 2.0L/H-4, 6spd, 4.11:1 Fast Enough Stock