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yes an #6



the fittings on the cooler and trans are -4, is that going to be okay?



you should be fine #4 = 5/16 which is the stock size.

#6 is 3/8 which is a nice upgrade but the stock fittings in the trans are very small already 1/8 npt and imo need to be enlarged to get the added benefit of the bigger line.