Thumping noise

I have a thumping noise under the floor board in my 96 F150 short bed pickup and I think it may be a bad bushing on the steering mechanism. I had a 1 ton 65 which had those missing and I couldn't replace them as the nut was on the frame.
Both are ranch work trucks and shop space and tools are limited.
Does anyone have a clue as to what I am trying to describe.http://www.automotiveforums.com/vbulletin/images/icons/icon5.gifhttp://www.automotiveforums.com/vbulletin/images/icons/icon11.gif

Sounds like a radius arm bushing

i would second what fordtruckonly said crawl under and have some one bounce up and down on the truck you may see whats moving to cause the thump

I have a thumping noise under the floor board in my 96 F150 short bed pickup and I think it may be a bad bushing on the steering mechanism. I had a 1 ton 65 which had those missing and I couldn't replace them as the nut was on the frame.
Both are ranch work trucks and shop space and tools are limited.
Does anyone have a clue as to what I am trying to describe.http://www.automotiveforums.com/vbulletin/images/icons/icon5.gifhttp://www.automotiveforums.com/vbulletin/images/icons/icon11.gif
Reminds me of the time I forgot Fluffy's leash was tied to the passenger side door handle.:uhoh: It was kind of loud at first, but gradually when away!

If it is a regular thump that speeds up when the truck is going faster, the problem more than likely is a bad universal joint on the drive shaft.