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2015 Silverado 2500HD transmission cooler line started leaking last week. I ordered the DRP replacement kit from alligator.

The directions arent very clear about which line comes or goes to the radiator or external cooler. Or which goes where on the transmission.

On the bell housing:
The bottom fitting line is labeled "to cooler"
The top fitting is labeled "from cooler"

I guess my question is: does the fluid leaving the transmission flow through the internal radiator cooler, or the external cooler first?
 

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LHN...We ARE the Joneses
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26,485 Posts
Trans fluid flow is to the Rad, then a short line runs from the Rad to the aux cooler out front, with the 3rd line being from the cooler back to the trans.
 
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