Hey guy's hope you can help. Yesterday I got home from a 20ml drive and noticed that the hole undercarriage of my truck was wet with some type of oil.I crawled under there and noticed that it had came from the vent line on the transmission,I though no big deal it was probably to full and it leaked.I checked the fluid and it was fine,right at the top fill line.I cleaned the truck and went on my merry way. Today I get home from the same drive and again the undercarriage is soaked!! Help guy's what gives?? The fluid level has always been full but not over.I don't get it hot on the drive home,it's all hwy and the temp does not go past 160 degrees .I have no idea what could cause this. Any help is appreciated. The truck is an 05 6.0 2500hd cc Lb 4x4 with the 4l80e.

 

how many miles and what is the service history like on it? i believe on that trans you do fluid changes every 50k