Clunk noise on acceleration

[{tpc}]

When the trucks came to me they were unloaded and no trailer on and I could make them make a single clunk on Accel sometimes they would clunk once coming off Accel. These were all parking lot maneuvers from a stop. Just a quick stab of the throttle. I never had the chance to test in any other conditions such as loaded or with a trailer.

Gotcha, ok I was just wondering if it was towing specific, like mine.

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[mmdpg]

Just in case you are hearing the same thing as me, when I fill my 36 gallon gas tank I hear a thump from the rear end of the truck until the tank goes down to about 3/4 full. I assume it's the gas sloshing against a baffle in the tank when nearly full.