3502-221 – Flange Yokes – 1350 Series – Bolt Circle Dia 4.000″ – Pilot Dia 2.245, F

When a 1350 series flange yoke fails, the symptoms show up fast: driveline clunk under acceleration, vibration that doesn't go away with speed changes, or visible play at the diff flange. The 3502-221 flange yoke is the spec-correct replacement — correct bolt circle, correct pilot, correct series. Dimension confirmation before ordering is still the right call.

3502-221 Flange Yoke — 1350 Series Specifications & Fitment

The 1350 series covers 3/4-ton trucks — F-250, Ram 2500, Dana 44/60 axles, performance 4x4. The 3502-221 flange yoke specs: 4.000 bolt circle | 2.245 pilot | 4x0.400 bolt holes | 2.625" 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 3502-221 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: 1350 — built for 3/4-ton trucks — F-250, Ram 2500, Dana 44/60 axles, performance 4x4
• Bolt circle: 4.000 — must match axle/diff flange hole pattern exactly
• Pilot dia: 2.245 — centers yoke on companion flange, no play allowed
• 4 bolt holes at 0.400 — verify hole count and size
• CJ-to-flat: 2.625" — affects driveshaft working angle clearance
• Brand: UDS — direct-fit replacement

Specifications

• SKU: 3502-221
• Brand: UDS
• Series: 1350
• Bolt Circle: 4.000
• Pilot Dia: 2.245
• Bolt Holes: 4
• Bolt Hole Dia: 0.400
• CJ to Flat: 2.625"