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  • Thrust bearing in rear planetary fails


Thrust loads from output shaft and gear train coupled with poor quality replacement bearings.


Replace OE bearing with OE-quality Sonnax thrust bearing.

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

Thrust Bearing
Part No. 77731-10

Sonnax fully enclosed selective thickness thrust bearing 77731-10 is a direct OE replacement for the rear planetary captive thrust bearing in GM 4L60 series units. Sonnax also offers 0.140” thick bearing 77731-09.

Planetary pinions must be removed for installation.

  • Outer Dia.: 2.150"
  • Inner Dia.: 1.580"
  • Thickness: 0.160"
  • 77731 10 combo
  • 77731 10