35 Spline 4130 Heat-Treated Moly Material - Extra Strong Maximum Strength & Reduced Rotating Weight Fits 4.56 & Numerically Higher Gear Ratios (4.56, 4.88, 5.13 etc) Provides Complete Lockup of Rearend Full Steel Spool for the Dana 60 Front or Rearend. 35 Spline. Fits 4.56 & Numerically Higher Gear Ratios (4.56, 4.88, 5.13, 5.38, etc).