4L60, 4L60-E

Heavy Duty Input Shaft
Part No. 77733-10S

Fits '85-later 298mm units with 30-spline input shaft. For '82-84 298mm units with 27-spline input shaft, converter and stator shaft will need to be updated to '85-later design.

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Input shaft failure is a common problem in GM 4L60, 4L60-E units as power levels are increased. The Sonnax heavy duty input shaft 77733-10S for 298mm torque converter units is ideal for any high-horsepower street or strip application. The shaft is manufactured from a specially heat treated steel with very hard outer layers and a more ductile inner core for strength and resistance to fracture. The feed holes are chamfered to reduce stress, and the shaft is further processed by shot peening and deep cryogenic treatment.

  • High strength steel ideal for high performance applications
  • Shot peened and cryogenically treated for extreme durability
  • Unique design protects against failure from stress cracks
  • 4L60, 4L60-E Heavy Duty Input Shaft 77733-10S


Harness that Horsepower! Your Guide to a Sonnax 4L60/E Level 3 Performance Build