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Re: 4L65 trans cooler adapter sizes
My 80e used the straight 0-ring fittings as well (but the 80e has a specialized fitting set).
The th350 up through the EARLY 90's 80e's all used the 1/4 NPSM o-ring fittings, literally every trans. If you look at the stock part, its the PTC with a 1/4 NPSM on the other side.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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