First off. Did you fill al the way up to the HIGH fill point? If you did fill all the way to the fill plug, you have WAY to much fluid in there and most likely its getting hot and expanding then coming out the vent tube. Also, there was a problem with some of the Rockcrusher (same Company) covers being porus. The casting was bad and the oil would actually seep out of the cover.
ASE Master L1 Certified since '96
00 TJ, RockKrawler Pro 8 Coil-Over Stretch Kit (104") and some other "stuff"....
07 JK Rubicon 2 Door, RockKrawler 5.5" Long Arm "X" Factor lift kit, 5.13 Gears, AO Emissions canister skidplate, 1310 U-jointed driveshafts, 37" Mickey Thompson Baja Claw tires on Walker Evans beadlocks, ORF Front bumper, Olympic Rock sliders, Alloy USA front Cro-mo shafts