Rhymthmic Thumping on Passenger Floorboard

[jmoore]

Lately my wife has been driving my 99D2. Just yesterday, my son mentioned that he could feel an occasional rhythmic thumping on the passenger floor board. It's not constant, but today while driving I heard it too. I replaced the front drive shaft awhile ago and do grease it. I'll get under there and check it out, but what else could cause that? I know that is were the frame rails are and cats. It's a low thump sound. weird.

 

[jmoore]

Nevermind! I figured it out. The heatshield over the cat had come un-done and must have been occasionally flapping up against the floor board. Thank goodness. I sure didn't want that drive shaft to grenade!

You can now return to your regularly scheduled programme!

 

[sir]

thought it might be a nearly dead cat

 

[flyfisher11]

Hey John,

Long time no post. How's that POR 15 job holding up for you?

Cheers,

Mike

 

[jmoore]

A dead cat sounds more like a miraca. A tinny rattling sound. This was more of a hollow thump.

Mike,

I touched up the POR-15 last year and top coated it with Penetrol. It's doing really great! Up here we have heavy salt in the winter and it's brutal on cars, but the prep work I did seems to really have worked.

 

[PMA1420]

fathers wife had her cat in the engine bay for 25 miles or so. White fluff bounced down the interstate. It lived a long tail eating brain damaged life.

 

[group captain mandrake]

fathers wife had her cat in the engine bay for 25 miles or so. White fluff bounced down the interstate. It lived a long tail eating brain damaged life.

That reminds me of an incident on the farm when I was a kid.

***WARNING!*** Crazy cat people stop reading now!

It was late summer, time to fire up the combine and get it ready for harvest. We had an old Massey-Ferguson combine with a Chevy 350 engine. Apparently the fan shroud area made for a pretty comfy nesting place for the barnyard cats. We never found out how many cats were sleeping in there, but they made up enough rotating mass in such a confined space that the radiator, hoses, and belts, were all wiped out.
That was a disgusting mess to clean up.

 

[fiftywattplexi]

Interesting, I too can feel (but not really hear) a random thumping on the passenger floor board of my wife's DI. I wonder if its not a similar heat shield issue as it turned out to be on jmoore's DII - I'll have to get under there and check it out. Any other ideas on what it could possibly be so I might have a better idea of what to look for?

 

[MUSKYMAN]

this thread is far from over...heat shields dont rythmic thump that I have ever seen.

what tires are you running?...does the truck sit in that cold NY winter alot?

I would start at the front right tire and start working inward