• Planetary failure
  • Planetary wear


Insufficient lube oil and/or excessive clearances.


Sonnax offers replacement parts for rebuilding damaged rear planet assemblies and gives rebuilders the option of replacing only the worn components.

4L65-E, 4L70-E

Round Washer
Part No. 77732-04

For 5-pinion rear planetary assemblies.

Package Quantity: 10

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Sonnax round washer 77732-04 is a direct replacement for worn or damaged OE washers in five-pinion rear planetary assemblies. This Sonnax washer is made from through-hardened steel to help eliminate needle roller thrust wear.

  • 4L65-E, 4L70-E Round Washer 77732-04