external transmission cooler

[Scoobum]

I honestly don't know...as I've always let it go off the foot brake. It does have a transbrake in it...but I haven't had enuf hard parts in it until recently to give it a go.

[motorhead]

Normally, the external cooler is mounted such that the outlets are pointed to the side for hose routing convenience... .this should eliminate any possibility of an air pocket even tho the tranny line pressure should be sufficiently above atmospheric to force any air on thru the system and out the vent.

With regard to the factory cooler, you are pretty much stuck with factory routing unless you want to go to the trouble of changing  it around.

And what about fluid drain back? That'll put some air in the lines. Also keep in mind that once the fluid leaves the trans it has done its part so who cares how much air it contains (aeration notwithstandin g)?

[ULYCYC]

Since the fluid pickup is direct and in the pan the cooler position doesn't really matter. I wouldn't go out of my way to cause areas to trap air and debris. You do want the cooler to work as it was designed too.