T100 Noise At Low Speed?

[Doyle O. Bailey]

1993, bought new. Close to 300k miles. Love the size and comfort of the single cab with formal bench
seat.

Question: At low speeds (very low like backing up, etc) there is a noise, especially when breaking, to
change direction (parking for example). Been hearing the noise "thump" I guess describes
as well as anything. Been going on for a while, doesn't seem to be a driving problem.
My question is: what would cause this? At first I thought it was my trailer hitch ball rolling back and forth
behind the seat of the truck. Then, after a while realized that wasn't what is happening.

Everything still works, no problem going down the road. Any ideas?

Doyle

 

[LBD WV]

I would have someone walk beside while backing up and locate the area, that will tell you where the problem is and probably you can figure out the rest.

 

[Lon Ross]

Put it up on a lift in park, spin each rear wheel as much as you can back and forth and look for the play / noise. Most likely at those miles a U joint is warring out.