I have also had this oil leak problem. Mine appears to be coming from between the trans and oil pan like you but also from the blow tube on the side. but mine is a very very slight leak (not even enough to drip) so im not gonna worry about it until it gets worse
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05 2500 SLT, 6 speed manual STOCK CLUTCH, Smarty, Banks 6 Gun w/PDA, HTT 62/13/71 SS, Hi-Ram Intake,ATS Exhaust Manifold, K&N Cold Air, Stage 2 Snow Water/Meth, FASS 150/150, Custom 4" Duals, 2" LK