• TCC slip codes
  • No lockup
  • Overheated fluid
  • No Overdrive


TCC apply oil leaks past the front stator support bushing.


This wide front stator support bushing fills the entire stator support shaft bore.

4L80-E, 4L85-E

Stator Support Bushing
Part No. 34016-W

Package Quantity: 4

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GM 4L80-E and 4L85-E units may display no converter lockup or codes 68, 39, 1870 or P0741. Imbalance of torque converter clutch apply oil through the front stator support bushing contributes to this complaint. A journal clearance of .002" or more will generate sufficient leakage to cause lockup clutch slippage, causing the transmission to stay in third gear. Sonnax front stator support bushing 34016-W is designed to reduce leakage by minimizing journal clearance and also increasing journal length.

Due to stator shaft variations, in some cases it may be necessary to hone the bushing I.D. slightly for proper fit. See instructions for details.

  • Bushing Style: Precision
  • Material: Steel-backed bimetal
  • Width: 0.675"
  • Shaft Dia.: 1.123"
  • Housing Bore: 1.244"

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

GM 4L80-E, 4L85-E, TH400 Valve Body Layout

GM 4L80-E, 4L85-E, TH400 Valve Body Layout
  • 4L80-E, 4L85-E Stator Support Bushing 34016-W
  • 4L80-E, 4L85-E Stator Support Bushing 34016-W