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So my 12bolt in my 65 has an HH stamped on it. I found a decoder and it read "c15 overdrive 4.11". Not sure what c15 is? I didn't think there was such a thing. Also it says overdrive, I assume that is referring to the transmission?
 

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You are correct, most C10 or 15 ( which they never listed ) came with overdrive three speed transmission with the 4.10 axle....the C15 usually came with helper springs..
 
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