6.5-4-3581X (also variant 6.5-4-3581-1X) is a heavy-duty Dana Spicer 1810 Series Pinion/End Yoke Assembly used in commercial trucks and heavy driveline applications. Key Specifications Series: 1810 Series Style: Strap style / End yoke assembly Spline Count: 46 splines Major Spline Diameter: 2.374 in Ground Hub Diameter: 3.250 in Length Through Hole: 2.875 in Centerline to End of Hub: 5.688 in Material: Forged Steel Compatible U-Joint Kits: Spicer 5-281X, 5-676X (varies by exact sub-model)
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