I wrote a while back about a clunking sound sometimes heard and felt on take from a dead stop. I had also read here, and other laces that this could be differential issues or transmission movement, yoke...etc. 2 weeks ago I carried about 800 lbs. of lumber, and I noticed it wasnt clunking under that load. The truck was emptied, and again the next day it clunked randomly on take off. ran empty for two weeks. Clunkity-clunk. Today we loaded a 400 pound sliding drawer tool box in the bed, and not once did it clunk. So...what is this? What is going on? My mind is now blown.

 

CHECK SHOCKS ; LOOSE EXHAUST . OR ANYTHING ELSE UNDER NEATH THAT COULD BE LOOSE I HAD A LOOSE RUNNING BOARD MOUNT MAKING SIMILAR NOISE