3102-391 – Flange Yokes – 1310 Series – Bolt Circle Dia 3.386″ – Pilot Dia 3.937, OD

Replacing a worn or damaged flange yoke starts with getting the right part. The 3102-391 flange yoke is dimensioned for one bolt circle, one pilot diameter, and one drivetrain series — 1310 series. A mismatched bolt circle means the yoke won't seat flat. A wrong pilot means the driveshaft runs off-center. The 3102-391 flange yoke removes both risks.

3102-391 Flange Yoke — 1310 Series Specifications & Fitment

The 1310 series covers light-duty trucks — F-150, Silverado 1500, Jeep Wrangler, Ram 1500. The 3102-391 flange yoke specs: 3.386 bolt circle | 3.937 pilot | 6x0.415 bolt holes | 2.592" CJ-to-flat. Pilot diameter is what centers the yoke on the companion flange — that dimension must match exactly or the driveshaft will run off-center at speed. Bolt circle determines your hole pattern match.

Before ordering the 3102-391 flange yoke, measure your diff flange bolt circle and pilot diameter directly. Don't rely on series designation alone — after an axle swap, the flange dimensions may differ from the original factory spec. Brand: UDS. Verify, then order.

Key Features

• Series: 1310 — built for light-duty trucks — F-150, Silverado 1500, Jeep Wrangler, Ram 1500
• Bolt circle: 3.386 — must match axle/diff flange hole pattern exactly
• Pilot dia: 3.937 — centers yoke on companion flange, no play allowed
• 6 bolt holes at 0.415 — verify hole count and size
• CJ-to-flat: 2.592" — affects driveshaft working angle clearance
• Brand: UDS — direct-fit replacement

Specifications

• SKU: 3102-391
• Brand: UDS
• Series: 1310
• Bolt Circle: 3.386
• Pilot Dia: 3.937
• Bolt Holes: 6
• Bolt Hole Dia: 0.415
• CJ to Flat: 2.592"