I have a 05 edge with a 3.0 manual trans and were the transmission bolts to the t case the bottom bolt is wet, it don't drip on the drive way just stays wet but im looking to fix it this weekend but some people has told me that its the seal inside the t-case, because it is suppose to be dry between the t case and trans need to if I just need the gasket for that or a seal to!

 

There is a hole to let out leaks, sounds like a t-case input shaft seal. Although I have had worse with other t-cases. Check to see if it's low. Then replace as you see fit. It's pretty easy to replace it.