cooler line NPT size

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smythge

65 with a BIG BLOCK
Joined
Dec 11, 2005
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What size are the threads on the transmission cooler lines on a 727 . I am guessing 3/8 but want to be sure
 
Are the fittings the same size in the radiator? Also any recomendations on what to run for cooler lines, from the transmission to the radiator. I like the idea of flexible tubing, either rubber or braided any pros or cons to this?, any suggestions would be helpful.
 
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