Hello everyone, I brought this up a few years ago, but I thought I'd bring it up again with a clearer understanding of things. The basic problem is that my original non-rebuilt Edsel's 2 speed automatic transmission overflows out the dipstick tube when the engine is cold. Typically it does it when the engine reaches upper RPMs. (Example: the engine operating at increased RPM for warm up or after the engine is starting to warm up and I step on the gas pedal to drop the carburetor out of choke mode) Once warm it won't do it anymore. It is not overfilled and the original dipstick is being used. Also, I've looked at the vent at the top of the trans and even used compressed air to blow it out. I thinks it's alright. The only changes I have done are add an aftermarket trans oil cooler and spin on transmission filter. The cooler does sit high in relation to the cooler lines. I mounted the cooler even with the top of the radiator. The spin on filter is mounted high too, next to the cooler. I understand it probably needs a rebuild, but before that happens, I'd like to drive it for a few years. The transmission works great besides the overflows. It shifts nicely and at the correct speeds. If its the seals, I'll live with it for a while, but I just want to make sure it's not doing this because of something I've done. I've been thinking about putting a check valve inline with the cooler lines so that nothing drains back when I park. Thoughts?

If that overflow problem is consistent (does it every time the engine is cold), then I’ll suggest temporarily unhooking the cooler and oil filter and see if the problem persists.  If the ‘burping’ from the fill tube stops, then relocating the oil filter to a much lower position would be worth trying.  You didn’t mention the orientation of the spin on oil filter but it should be mounted in a vertical position which should help to minimize any drain back to the transmission assuming it is mounted at a point higher than the transmission pan.  Another possibility is that the added filter is simply too fine or too small thus inhibiting the cold flow of the ATF.

Lorena, Texas (South of Waco)

Not only the filter but I would suggest mounting the cooler lower too

My 1959 Edsel Ranger also does this. I have owned it since 1975 and have driven it 110,000 mostly trouble free miles since then. The old 292 is still going strong and I am sure that it has never been apart. However the two speed trans does exactly what you describe and has during the entire time I've owned it. Seems to belch some ATF out the dipstick tube at random times but more so when cold. It gets on the exhaust manifold and smokes & stinks.