one of the lines should be the same, transmission to lower radiator cooler
from top of radiator to this cooler in
out from this cooler back to the transmission
GM GENUINE 25999420
GM GENUINE 15779543
the best time to upgrade the trans cooler is before you put 100k towing miles on it, i sposed the next best time is now :secret:
props for actually changing the fluid often after seeing those temps
cooler looks very similar to the popular transcool 40k, but even easier install
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