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  • Bushing failure
  • Reaction carrier shaft damage


Oil leakage due to inadequate support of the reaction sun gear.


The Sonnax sun gear bushing is more than one-and-a-half times as wide as the OEM and maximizes bushing support.


Measure the sun gear bore. Installing this bushing into a bore that is smaller than 1.705”-1.706” will result in a tight fit with the mating reaction shaft.

4L60, 4L60-E, 4L65-E, 4L70-E

Wide Reaction Sun Gear Bushing
Part No. 77010-01

May not work in some late-production sun gears with OE finish-in-place bushings.

View Instructions

The Sonnax wide reaction sun gear bushing 77010-01 is one-and-a-half times the width of the OE version and fills the entire sun gear bushing groove. This wider bushing maximizes support. The bushing is steel-backed bronze that is precision machined to provide minimal clearance with the mating shaft.

  • Provides better control of lube oil
  • Has more support for sun gear and reaction shell
  • Greater longevity than OE bushing
  • 1.5 Times wider than OE for maximum support
  • Material: Steel-backed bronze
  • Bushing Style: Precision
  • Housing Bore: 1.706"
  • Shaft Dia.: 1.575"
  • Width: 0.600"
  • 77010 01 combo
  • 77010 01