2013 Screw with the 3.7, I bought the truck brand new last year and it only has 14,000 miles as of now. I took it to the auto hobby shop on base so I could change the oil and rotate the tires. Once I got it on the lift I noticed a nice residual buildup coming from in between the crankcase and the transmission. It should be easy to tell if it is motor oil or transmission fluid, however I couldn't tell because it was dusty and didn't smell fruity like trans fluid or smell like oil. So I'm not sure if the rear main seal is leaking or if it is coming from the trans. I'm pretty pissed off about it since the truck is still pretty new and the trans will be have to be dropped. I know its under warranty but I don't want things to be torn apart this early in the trucks life and have other things go wrong because of it. Before anyone suggests that it is left over from the oil drain plug, it's not! I checked . It's a little disturbing since I will be towing a 26' travel trailer tomorrow for a camping trip but I won't worry too much since it hasn't even leaked enough to leave drops on the ground. Anyone else have this problem?

 

It looks to be a rear main seal or input shaft seal on tranny...

 

That barely looks like a leak, clean it off and see it gets actually bad