2354-684 – Stub & Midship Shaft – Bearing Dia 985″ – Butt Dia 2.375″ – End To Weld 7.550

The 2354-684 midshaft stub is the center section of a two-piece driveshaft — it carries the center support bearing and bridges the front and rear shaft assemblies. Spline count, spline diameter, and butt diameter are all spec-specific. The 2354-684 midshaft stub won't fit a different tube OD or a different output shaft spline, and substituting a close-but-not-exact part will produce vibration that traces directly back to this component.

2354-684 Midshaft Stub — Spline & Tube Dimensions

The 2354-684 midshaft stub specs: 19 X 0.850 spline | 879" spline length | 2.375" butt dia | 7.550" end-to-weld | fits 2.500 tube. Used on multiple Honda shafts, 30mm hub behind bearing. The butt diameter determines how the stub seats in the driveshaft tube — too loose and the weld joint runs off-center. Spline length determines engagement depth on the output shaft; short engagement under high torque loads damages the shaft splines before the stub shows any sign of wear.

When replacing a midshaft stub, measure both the tube ID and the output shaft spline count before ordering. Check runout on the new 2354-684 midshaft stub before welding — a stub with more than 0.005" runout will never balance correctly regardless of how many weights you add.

Key Features

• Spline: 19 X 0.850 — verify against output shaft
• Spline length: 879" — full engagement required under load
• Butt dia: 2.375" — must seat concentrically in driveshaft tube
• End-to-weld: 7.550" — factors into total shaft length
• Tube fit: 2.500 — designed for this tube specification
• Bearing dia: 985" — matches center support bearing inner race
• Brand: UDS
• Note: Used on multiple Honda shafts, 30mm hub behind bearing

Specifications

• SKU: 2354-684
• Brand: UDS
• Spline: 19 X 0.850
• Spline Length: 879"
• Butt Dia: 2.375"
• End to Weld: 7.550"
• Tube Fit: 2.500
• Bearing Dia: 985"
• Notes: Used on multiple Honda shafts, 30mm hub behind bearing