light coating of fluid on AW4 output shaft

I have my transfer case down & noticed a coating of gTranny fluid on the AW4 output shaft, is this normal or is there some seal that needs to be replaced?

Its been a while since ive wrenched on an aw4 equiped xj, but IIRC, theres a butthole chamber in the back of the aw4 housing, that seals onto the imput shaft of the t/case. Some fluid lives here, just enough to spill all over the place when pulling the trans...

I could be confusing the ax15/aw4, whenever i pull drive shafts or t/cases, if i grab a pan, it doesnt leak... If i dont grab a pan, it dumps....

If its just a little bit I wouldn't worry about it, could just be seeping through the oil film on the rubber seals, or leaking around the edge of the cup bearing inside the input shaft.