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trans fluid flow direction for coolers on a 4l80e

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Old 05-03-2009, 09:40 PM
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Default trans fluid flow direction for coolers on a 4l80e

does anyone know which port for a new style 4l80e (one in back and one up front), is the inlet and the oulet to the cooler?

On the factory cooler in the radiator, which one is the inlet and the outlet?

last question, does the fluid hit the cooler in the radiator first or does it hit the outside one first?
Old 05-03-2009, 09:51 PM
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Not sure which one is which on the trans, but IIRC, the upper line on the radiator is the return (outlet), and trans fluid travels through the radiator first, then through the aux cooler, then back to the trans.
Old 05-04-2009, 09:02 AM
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Oil flows out the front connection on the transmission to the radiator and then in the passanger side of the aux cooler.
Oil leaves the driver side of the aux cooler and back to the rear connection of the transmission.
Old 05-04-2009, 09:24 AM
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Originally Posted by Oldcrow
Oil flows out the front connection on the transmission to the radiator and then in the passanger side of the aux cooler.
Oil leaves the driver side of the aux cooler and back to the rear connection of the transmission.

cool, thanks guys, i desided to change my cooler setup and run it back through the radiator first and then to the out side cooler so i can drive it everyday and hope it would stay alittle cooler, my trans was getting hot with just a 26k cooler
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