• Bushing walks out


Lack of flange or stop surface on the case bushing.


Sonnax no walk-out case bushings are flanged to prevent movement in either direction.

4L80-E, 4L85-E, TH400

Case Bushing
Part No. 34006-SP

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The OE case bushing in vehicles with a GM TH400, 4L80-E and 4L85-E transmissions tends to walk out of the housing bore. This leaves the output shaft unsupported, ruins the governor gear and can cause case damage. The no-walk flange feature of the Sonnax case bushing 34006-SP is specially designed to keep the bushing in the case bore.

  • High-quality bronze
  • Flange on the transmission case side prevents bushing from walking completely through the bore
  • Flange accurately locates and helps retain the selective washer
  • Machined oil grooves allow for a supply of lubricating oil to enter the extension housing as well as the transmission case.

The housing bore should not measure more than 2.1285" in diameter for an ideal fit.

  • Material: Bronze
  • Bushing Style: Precision
  • Width: 0.630"
  • Shaft Dia.: 2.006"
  • Housing Bore: 2.129"
  • 4L80-E, 4L85-E, TH400 Case Bushing 34006-SP