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  • Sonnax, 22121B-01, Shaft, HD Input & Hub One-Piece 300M Steel A618/48RE 1994-Up
  • 48RE A618 Sonnax One-Piece Heavy Duty Input Shaft and Clutch Hub for years 1994-Up
  • Seeing Spots? Sonnax uses Ultra Strong Steel.  Hardened steel sometimes shows random spots, which are visible on the 22121B-01 One-Piece Input Shaft and Clutch Hub, 1994-Up.
  • Sonnax 48RE A618 One-Piece Heavy Duty Input Shaft and Clutch Hub, 1994-Up.
  • 22121B-01, Sonnax One-Piece Input Shaft and Clutch Hub connection Point.  No splines in the connection.
  • 22121B-01, Sonnax close up of Input Shaft and Clutch Hub union
  • 22121B-01, Sonnax 1-piece design versus OEM 2-piece design.  See the spots?
  • 22121B-01, Sonnax 1-piece Input Shaft design versus OEM Shaft.  Yes, you can see the spots on the forged 300M Ultra High-Strength Steel.

Sonnax 22121B-01 - A518 48RE Heavy Duty Input Shaft

$799.95 $749.97
(You save $49.98)

Product Description

Phoenix Transmission Parts, Inc. is an authorized Sonnax Distributor.

Phoenix Transmission Parts offers this one-piece Sonnax Heavy Duty Input Shaft and Clutch Hub for hard working Chrysler A618, 47RE, 47RH and 48RE transmission applications.  

The unique one-piece design of the Input Shaft and Clutch Hub provides a stronger, more durable connection by removing the weak point between the Input Shaft splines and the Clutch Hub.  The OE two-piece shaft/hub design often fails where the shaft and the clutch hub meet.  After time, heat, and pressure, the shaft splines strip.  The stripped input shaft splines won't turn inside the clutch hub and the input to the vehicle stops.  The innovative Sonnax design joins the Input Shaft and the Clutch Hub as one piece, so the there are no splines to strip.  This leads to greater capacity and longer transmission life.

In addition to eliminating a weak point, Sonnax manufactures the Input Shaft with "Ultra High-Strength" steel.  A proprietary forging process creates spots or blemishes on the shaft, which indicate the toughness of the steel.  If you look closely at the images, you can see the spots that appear on the shaft due to forging the ultra high-strength 300M steel.   Also, Sonnax used the internal grain structure of the steel to move with the general shape of the shaft to improve strength.

This Heavy Duty Input Shaft is recommended for applications that involve towing or hauling heavy loads.  The Chrysler A618, 47RE, 47RH and 48RE transmissions are built for vehicles with High Performance towing capacity, such as the Dodge Ram 3500.  


Product Details:

  • Unique, ultra-strong, one-piece design removes the weak connection between input shaft splines and forward clutch hub.
  • Each Sonnax shaft is fabricated from forged steel, and can be used with OE seals.
  • Custom forged from ultra-high strength 300M steel
  • 23-Tooth input spline, 62-tooth clutch spline

Parts ship daily from our distribution center. Expedited shipping available.
Packaged for wholesale distribution.

GOT QUESTIONS on your specific Year/Make/Model?

Send us a message to or call (877) 782-5582.

¿Preguntas en español? Escríbanos a con el año, la marca, y el modelo de su vehículo o llámanos a (877) 782-5582.

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