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  • Failsafe mode
  • Speed sensor plausibility codes


Broken, chipped, spun or cracked speed sensor ring.


Salvage output carrier assembly and restore normal operation by installing Sonnax output speed sensor ring.

4L80-E, 4L85-E

Output Speed Sensor Reluctor Ring
Part No. 34880-01

View Instructions

GM 4L80-E and 4L85-E units commonly suffer damage to the output speed sensor reluctor ring such as cracks, chips or breaks. Failsafe mode and speed sensor codes can result when this occurs. Installing Sonnax output speed sensor reluctor ring 34880-01 allows salvage of the output carrier assembly and restores normal speed sensor operation.

  • More durable than OE reluctor ring
  • 4WD and late-model 400 carriers with full-width park lugs can also be modified to accept reluctor ring for use in 4L80-E & 4L85-E applications

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 34880 01 combo
  • 34880 01