This is a cambered 9 inch rear end manufactured by Track 9 59 3/4 +1/4 +1/4 See photos for condition and additional information, I believe that this has been modified or repaired at some point
Diamond Track 9" Ford Billet Aluminum Locker 31 Spline 2.891" Bearing Track Tech
Tex Racing Cambered 9 Inch Rear End
9" Ford 27 3/4" Crowned/Cambered 31 Spline Axle ARCA CRA Asphalt
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9" Ford 27 1/4" Crowned/Cambered 31 Spline Axle ARCA CRA Asphalt
9" Ford 32" Crowned/Cambered 31 Spline Gun Drilled Axle ARCA CRA Asphalt #3