Well it’s either the breather or companion flange sealing surface is really worn. When I did the seal I noticed the breather hose was rotted off the transfer case actuator. I trimmed it and stuck it back on. It might have been to tight and pinched. Maybe pressurizing the transfer case? I bought a stainless 1/8” barbed union and 1/8” ID fuel line and made an extension tonight. We will see if that helps first. Otherwise new companion flange and new seals all over will be $200. I tried to blow through the breather tube. Felt like it kept taking air but when I let off it push out some nasty gear oil gas. Yuck That might be normal if the breather has inherent flow restriction?