Originally Posted by John_Kunkel
Originally Posted by A727Tflite
The only thing Chrysler did to try and address drainback was to add the anti-draindown valve in the cooler line on rear wheel drive vehicles.


And that doesn't fully prevent converter drainback, it's more to prevent the high-mounted cooler in the side tank of crossflow radiators from draining through the converter. This wasn't a problem when the cooler was mounted in the bottom tank of downflow radiators.


Drainback has existed since day one. It’s exacerbated by cooler placement and pump internal clearances.

It exists in cooler placement below the pump too - front wheel drive vehicles are prone to it as well.