3502-291 Flange Yoke Serrated 1350 Series , Bolt Circle Diameter: 2.913 Rectangle pattern with 1.870 x 2.232 Bolt Hole: 0.335 40038359

Drivetrain Bolt-Flange Interface: The 3502-291 Explained

Flange yokes carry the full torque of the driveshaft into the differential or transfer case through a bolted joint rather than a sliding spline. The 3502-291 is a 1350 series part with specific dimensions selected for companion flanges presenting a 2.913" bolt circle. Its SERRATED" pilot registers the part on center before any bolt is tightened -- critical for balance and for preventing the bolts from carrying shear loads they were not designed for.

Part Specifications

The Role of CJ-to-Flat Dimension

The CJ-to-flat measurement (2.067" on the 3502-291) defines the distance from the center of the u-joint cross to the machined face of the flange. This dimension must match the geometry of the companion flange's recess -- too short and the cross will not seat; too long and the cross will be pre-loaded against the cap bottoms. Always verify this against the companion flange you are mating to, especially in custom or multi-make builds where the flange may have come from a different vehicle platform.

Installation Best Practices

• Clean companion flange face thoroughly -- any burr or scale under the mating surface creates runout
• Insert pilot and hand-thread all fasteners before torquing any single bolt
• Torque 4 bolts in a star pattern to achieve even clamping
• Verify zero wobble by rotating the shaft by hand before lowering the vehicle
• If using a rubber strap-type u-joint retention, confirm strap bolt torque is within 1350 series spec

Why Universal Driveshafts Stocks This Part

Universal Driveshafts maintains deep inventory across 1350 series components because this is a high-velocity replacement category -- axle shops, fabricators, and fleet operators all need these parts on short notice. The 3502-291 is available for immediate shipment, so downtime is measured in hours, not weeks.