92 gmc 3500 4l80e 7.4l tbi

[Bigpapa@murph]

I have 92 had 3500 454 tbi with a recently rebuilt 4l80e. I was getting trans fluid blown out the dipstick tube. So I cleaned the vent on top of the transmission. I blew through the cooler in the radiator. It was clean. Now even on a cold startup it will puke all of the fluid out the top vent. I added a large aftermarket cooler. But it still does it any ideas. The vent on top doesn't have any rubber hose at all just the metal vent new remain torque converter. What would cause this. The fluid smells slightly burnt.