Oil Cooler Line Fitting size

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df2x4

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So 3/8" is the factory size.

According to the OP of that thread I linked to on the last page, yes. First picture in that thread. He used 3/8" NPT to -6AN adapters. That appeared to be on a factory Vortec 5.7L though, not sure if your LS setup is the same or not.
 

Ajjuarez

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I honestly have no idea. I just know that I'd read 5/8"-18 inverted flare was the factory size for those radiator trans cooler line fittings, so that's what size -6AN adapters I bought for my 4L80E swap. Went in just fine, no leaks.

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Whats the thread size for the transmission
 

df2x4

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Whats the thread size for the transmission

You mean the fittings in the transmission itself? If so sorry, I don't know. I bought Russell 4L80E to -6AN fittings, part number 641390.
 
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