Hello, My 69 Chevelle SS, TH400 Tranny just to clarify is having a problem.

I started hearing a noise a couple weeks ago.. at first I thought it was the power steering pump because it kept losing fluid. I changed the pump... My leak is gone, yeah... but the noise is still there.

I crawled under the car and noticed that the noise is comming from the tranny somewhere. The car drives like normal, shifts normal, and with exception of the noise seems just fine.

The noise sounds like when we were kids and put a playing card on the forks of our bikes so it could flap against the spokes of the rim. Also similar to the sound of sticking a pencil in a Box Fan.

The noise gets faster as I drive faster. Another odd thing.. if I am going about 40 or so, and I give the gas pedal a goose or two, the noise will stop. The noise isn't synchronized with the exhaust like a lazy lifter would be.

Your Insight please..

thanks..

David

converter bolts hitting anything?

Or, maybe a cracked flexplate.
If you are under the car with it running and in Park the only things rotating besides the engine is the flexplate and converter.

The flex plate may be hitting the converter cover.

The flex plate is from TCI, and is less than a year old....
I recently found the hose on the modulator had come off...put it back on easy enough.

So... if I jacked the car up a bit.... took the dust cover off and put a halogen up there, I should see some time up smooth spot.. wearing... scratched.. something to indicate that this is where the problem lies?

So... if I jacked the car up a bit.... took the dust cover off and put a halogen up there, I should see some time up smooth spot.. wearing... scratched.. something to indicate that this is where the problem lies?

would be a good place to start

I concur with the flex plate bolts/flexplate. I've been there, done that...

I also had a cracked flexplate make that noise.

Doesn't sound like the parking pawl, right? It's synchronized with RPM and not road speed, right?

It isn't synchronized with the beat of the exhaust like a lazy lifter would be or It just doesn't seem like it is. The noise doesn't seem like metal smacking metal over and over, but I will take a peak in there this weekend.. Maybe I can get a wrench on the bolts... turn the crank a bit and check the rest.

I had a forklift that did the same thing.. It was the oil pump pickup tube rattling in the bottom of the pan. Change you motore oil and stick a welding rod in drain hole and see if its laying in the bottom...

If it was the oil pickup tube wouldn't I see I significant drop in oil pressure?