I just had the same problem, in just about the same area. It is definately the transmission line. You need to fix ASAP I have a 2.8 n mine an the way the crossover pipe is transmission fluid may be dripping o your exhaust. For a temp quick fix slice open about a 2 inch long 5/16th hoseslide it over the bad piece of lin and use a hose clamp to tighten over the hse on topof the area thats leaking. I haent had the time to change my line yet and I have been commuting 80 milis a day and no 1 drop has eaked since I repaired it.