knocking under drives floor

[ThePhoenix]

I have been getting a small thump when I accelerate from by my feet. i couldnt think of what it was...some said transmission mount bolt was loose...I thought it could be suspension related

but then while under the truck, I saw my body mount right under the drivers floor was pretty deteriorated

I think this is my thumping....the body is flexing

I still have my whumping, which I suspect is a bad wheel bearing...

but just a thought if you have a thump/clunk

 

[Sbyrne97]

what kind of bump or knock is it? Is it directly underneath your floor? Is it constant?

Could be a bad u joint or slip yoke isn't greased
Other than that you might want to try accelerating slowly...this will shift the transmission slower and you might notice the bump isn't as rough...just my 2 cents