6l80 Transmission Cooler Flow Direction
The transmission fluid low of the 6l80 goes as follows:
- Bottom line leaving the transmission to lower radiator port
- Lower radiator to upper radiator port out to external transmission cooler
- External transmission cooler to upper transmission cooler line port
If you do not have an external transmission cooler, the cooler line flow goes as follows: lower cooler line > lower radiator port > upper radiator port > back to upper transmission line.
