[acharles]

This may be a fairly common problem but it has a lot of consequences. My 96 Jimmy had transmission fluid in the majority of the vacuum system leading to leakage inside the cabin at the heater and AC controls. If you don't fix it, real problems can develop. It also causes transmission fluid to come out of the breather tube (has a little filter at the top). I suggest you fix it ASAP. After I replaced the seal between the transmission and the tranfer case in mine, I had no more problems. Also, you don't keep losing transmission fluid.