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Old 11-26-2019, 11:19 PM   #63
jcwren
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Join Date: Nov 2018
Location: Flowery Branch, GA
Posts: 206
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Having a RAY code, that's a 1972 KE 10 3.07 open rear end. There's a letter in front of the 251. It's very faint, and looks like a W, which would mean it was built in Warren, MI. 251 would be September 7th (the Julian date, which is the day of the year), and the 1 is the 1st shift.
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