How to bleed transmission lines?

[Mrturner1]

So I have a th400 and I just rebuilt the motor and installed a stall converter. I have a trans cooler built in to the radiator, as well as an auxiliary cooler. I'm wondering how to get the air out of the system once I get everything put together

[Shady Rascal]

It will self bleed when you start the engine and run fluid through the trans.

['68 Newtricks]

Originally Posted by Shady Rascal

It will self bleed when you start the engine and run fluid through the trans.

Yep, just make sure the bottom ports on both coolers are intake. Top ports should exit the cooler.

[mongocanfly]

Not sure if your trans is fresh built but if it is you need to get a can of trans line flush to get all the old fluid out of the system.I do it every time I change trans fluid.

[71CHEVYSHORTBED402]

OT, that TH 400 is pretty tuff. All I have is an external cooler. 140K and shifts as smooth as always, and that's despite an occasion I hauled far too many building rocks......up hill ..........6x12 trailer and bed loaded.......Whoops.

[Mrturner1]

Originally Posted by 71CHEVYSHORTBED402

OT, that TH 400 is pretty tuff. All I have is an external cooler. 140K and shifts as smooth as always, and that's despite an occasion I hauled far too many building rocks......up hill ..........6x12 trailer and bed loaded.......Whoops.

I was thinking of having just one cooler, but I just put in a high rpm stall converter too, so I want to keep it nice and cool

[Mrturner1]

Thanks guys

Matt