Thread: strange noise

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1970 351 w w/ auto tranny, when engine has been running for a while, there is a strange thumping. it can actually be felt through the brake peddle at a stop with car in gear. take it out of gear and it seems to stop. any ideas?

unfortunatley it only has a bout 5000 miles. seems to me i recall a crankshaft dampner doing something similiar

thanks, will do.

On a '76 Ford van with 351W/C6 the bolts holding the torque converter to the flex plate came loose and caused some really strange thumping noises, but I don't remember feeling it in the brake pedal. Easy to check, just pull the inspection plate.

That kind of thump could be from a broken tranny mount,,or motor mount as well.