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The adapter on our Chevelle has the white gear and is stamped 666F N8. I can only read the last two numbers on the next line "33".
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Probably .7333 or .8133. I have a couple of those here to try to match up to my COPO.
I've also managed to secure this cool bundle of parts to allow me to make up whatever ratio I end up needing...
I've seen lots of the SW versions but never an AC version, which Ed C. is supposed to have come on the car. Anybody got a picture?