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i traded for a racecar and I'm trying to make it streetable. It has a 8 3/4 rearend with a 742 case spool and 5:13 gears. I went to swap a 741 case with 3:91 posi and the axles from the 742 were too big to fit the 741 case. I thought they were all the same. Any thoughts?

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The racer bought a 35 spline spool and axes for his 8 3/4 You need a set of stock or street axles now to use with the posi