Don't know if you have an auto or manual trans but....
On the transmission is a vent hose that attaches to the top of the trans and the end with the vent is tied to the firewall or filler tube (if auto trans). The t-case also has a vent hose but on some years it just lays on top of the transmission (that's where mine was on my 03 auto). If that happens to be your t-case vent, extend it so the vent cap is high up in the engine bay.
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