Re: how to determine what axle i need
What Russ said is correct. The 1970 came in a wider width. The pre 70 is 30.5. Another way to be sure whether or not you have the wider or narrow rear end is to measure the housing. I just spied a thread on here that talked about what the housing widths should be for both configurations.
I didn't go moser, I went Alloy USA which you can also find on summit. They are a little cheaper if budget is tight and you wont be making a ton of power.
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