: Transmission "burping" fluid through filler neck

04-18-09, 09:44 PM
Hopefully someone can help here...

I had a problem on one of my 68's where after I would drive the car around the block, I would get a nice size puddle of tranny fluid under the car, coming out of the filler neck. after replacing the gasket and filter and then refilling it with 4quarts of fluid, it happened again...

What is the problem here, as i don't know too much about transmissions.

It has the thm400 in it btw...

04-18-09, 10:20 PM
somewhere on the top of the trans is a curved piece of pipe that is the trans vent. Its curved, maybe 3 to 4 in. long. Ck to see if its plugged up. Trans must vent somewhere either thru the vent or now the dipstick tube. It vents air, thats why its at the trans top.