Looking for a transmission diagram

I have a 1991 Chrysler New Yorker 3.3 L. I am about to flush the AT fluid because I am switching from +3 to +4. The car has 80,000 mi. Which hose is the return from the AT fluid cooler?

I already drained the pan and changed the filter
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"Which hose is the return from the AT fluid cooler?"
The lower (top hose is input  (supply)/ low hose is output (return)  that exits the AT fluid cooler.

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Maybe this will assist you.

"The return transmission line (the line in which transmission fluid flows from the transmission cooler back to the transmission) is located near the bottom of the radiator. There's two transmission lines connected in this location, and the bottom line is usually the return line."

Down the page you gets tips on the flushing. Good luck.
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