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.

 

There is a vent on the top of the trans, you could extend it, but you really need to locate the area the fluid is coming from.
There should be no drainback.
Are you sure you're not overfull? Check it in nuetral, hot.

 

tranny shouldnt be that full even if it all drains into the system, check where your leaks coming from first....

 

Hey HotMopr, got a parts list for all these goodies you got done up with the tranny? I may be looking to relocate the cooler and run different lines myself, as I am looking right now at bout killing my truck cause it has angered me so bad.

Sorry to wander off topic-