Auto Trans Cooler
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If your Expy is anything like the F series trucks, your 5.4L comes with an aux. tranny cooler already. How to tell? Look in front of your radiator, down low. On the driver's side is a cooler and that's for the power steering. On the passenger's side, there should be a cooler, only larger. That's for your tranny. If you can't see it thru your grill, try looking from underneath or thru the hood latching mechanism hole.