Symptoms:

  • Planetary failure
  • Planetary wear

Cause:

Excessive clearance due to worn pinion pins.

Correction:

Rebuild the front planetary assembly using Sonnax pinion pins.

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

Front Planetary Pinion Pin
Part No. 77732-09

Package Quantity: 5

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For GM 4L60/E, 4L65-E and 4L70-E, Sonnax OE-style front planetary pinion pin 77732-09 is hardened in the center for maximum wear resistance under punishing conditions. The pin ends are slightly less hard to allow easy crimping or swedging for a successful build every time.

  • 4L60, 4L60-E, 4L65-E, 4L70-E Front Planetary Pinion Pin 77732-09