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Brand: Sonnax

Other Part Number: 77731-02K, S74584A-3

Items Included: 4-piece set Rear Planet Pinion Pins

Manufacturer Part Number: 77731-02K, S74584A-3

Surface Finish: new

Material: Steel

Superseded Part Number: 77731-02K, S74584A-3

Universal Fitment: Yes

Vintage Part: No

Performance Part: No

700R4, 4L60, 4L60-E, 4L65-E, 4L70-E Transmission

Pinion Pin
Part No. 77731-02K

Fits 4-pinion rear planetary.

Package Quantity: 4

Sonnax pinion pin 77731-02K is a direct replacement for worn or damaged OE pinion pins in rear planetaries in listed GM transmissions. Hollow design features lube holes to reduce planetary burn-up.

Pinion endplay factory specification of between .008" to .024".

Symptoms:

  • Planetary failure
  • Planetary wear

Cause:

Insufficient lube oil and/or excessive clearances.

Correction:

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

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