66 Newport hard shifting when hot

surfdad1060

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I have a 66 Newport with a fresh 440, now that summer has really hit hear in SoCal the trans has started to shift hard when it gets hot. I’m wondering if my cooler lines are clogged or maybe I need an auxiliary trans cooler. Anyone have any ideas?
 
Fluid is full
Very well. Is it the right grade? I have lived in Bakersfield, where the temps get into the 110s, and now in Chico where 106 is not uncommon, and I have never experienced what you are. The temperature should not change the shifting of your trans. But, if you're running the wrong ATF, it might just thin out at higher temps.
 
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