I ahve a 1980 full size Bronco Custom with 92,000 actual miles. When I bought it several years ago, I have the rear output seal on the trnasfer case replaced. It still seemed like it would occasionally leak, but when I returned it to the shop they told me it was not leaking. The Bronco is not a daily driver, so it does not rack up a lot of miles, but I do monitor it carefully. Whenever I have it in for an oil change they check the tranfer case fluid level and tell me it is fine; it has never been low. My son has been driving it of late and I noticed that the seal did not seem to be leaking. However, during a recent weekend trip, I moved the Bronco into the garage where it sat for three days. When I returned, there was a series of spots in the floor in a relatively straight line perpendicular to the body and it appeared the trans fluid had dripped from the edge of the skid plate where it had pooled.

My question is this: Is there a vent on the transfer case that is allowing the fluid to escape in certian situations? The garage was stifling when I returned fromt eh weekedn trip. It was probably over one hundred degrees in the garage. Or do I need to return it to the shop that did the seal replacement?