Lately my TH400 has been whining. It sounds like I have a blower on the car. It started last year when I redid the heads on the car. At that time, I fixed a crack in the tranny filler tube. I used to keep the fluid level on the lower side, as to not make a mess every time I park. Since then, I had brought the fluid level where it needed to be. I have tried adding more fluid, and then having less fluid, but no change. I confirmed it to be the tranny, when I had all the belts off over the winter and fired it up...the noise was still there. It happens in P, N, and all drive gears. The noise subsides as the car gets up to temperature and I drive it a bit, but is still there. Also, the car is slow to shift into the next gear when cold, but works fine when it warms up. This is a manual valve body transmission, so the shift should be pretty instant. I just had the front end aligned, and had them listen as well, and they think that it may be the pump making the noise. After "researching" this on internet, a common issue is that the pickup filter may be clogged, and cavitating, or starving the pump. Some say to swap the paper type filter to a screen type filter. Another might be the O-ring at the top of the pickup tube. One more might be the bearings on the input shaft. I feel that I can rule out the converter, as it's been in the car for about 2-3 seasons now, and hasn't given me a problem yet. I ordered up a new pan gasket, pickup O'ring, and bought both types of filters. It should all be here tomorrow, and plan on doing this on Sunday. I will be reusing the fluid, as it is garage kept, still looks good, and 2-3 season old with about 1500 miles on it, Obliviously will be filtering it a few times before returning it to the tranny. This is an easy, non expensive thing to go after first, so that's where I'm heading. Any other insights on this would be great. Is there something else I should check out while I'm in there? My concern is about any other damage that may occur if the problem persists, or that may have already happened.