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Installing Transmission Cooler

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9. The 90-degree fittings swivel, and that means we can make sure it points in the correct direction without over- or under-tightening the fitting to the cooler. It also means that we have to hold the swivel in the direction we want it to go while we tighten it up. Transmission fittings aren’t included because there are so many variables. So we went with Summit Racing 1⁄4 NPS adapter (PN SUM-220027). If we tried to put an NPT fitting into our 4L60E, we’d likely crack the case. From there we used a Derale -6 AN to 3⁄8-inch barb fitting (PN DER-98200) that we also got from Summit.

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