Okay heres the problem... When my truck sits for long periods like now.(its been in the shop for a week for a new front seal and other goodies) It leaks trans fluid. I have all Aeroquip type AN fittings, braided stainless hose and a Remote filter with a fan powered remote cooler under the bed. It no longer uses any of the factory cooler stuff. (twins) Could all the fluid be returning to the pan and running out a overflow of some type? a quick look shows no leak around any fitting or other aftermarket stuff. The pan has the fancy new dbl O-ring plastic gasket with a Dbl Deep mag hytec and my dipstick tube is updated to the tophat type seal.

 

Shift shaft seal maybe? That's what mine was.