• Premature wear & bushing failure
  • Excess converter hub-to-bushing clearance
  • Pump noise


Worn or damaged pump bushing.


Replace pump bushing with Sonnax PTFE-impregnated pump bushing.

6L45, 6L50, 6L80, 6L90

Pump Bushing
Part No. 104034A

Not for use in 6L45 BMW models, which have a bearing in that position.

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The OE pump bushing in GM 6L45, 6L50, 6L80 and 6L90 transmissions utilizes a PTFE-impregnated load bearing surface to support large forces and survive dry-start conditions. Replacement bushings are unavailable from GM, so when this bushing eventually wears out, builders have the choice of buying an entire bell housing to get the bushing or settling for aftermarket bushings that can't stand up in this environment. Unfortunately, it is also very common for these units to suffer internal torque converter failures which create debris that ruins this bushing.

Sonnax PTFE-impregnated pump bushing 104034A is a direct replacement OE-style bushing which should be used in these 6L units that contain a worn bushing, or one that has been damaged because of an internal converter failure.

  • Sonnax bushing is impregnated with highly wear-resistant PTFE — not simply adhesive coated — providing unmatched durability
  • Excellent fatigue and seizure resistance
  • Precision fit and function assure long bushing life
  • Bushing Style: Precision
  • Material: PTFE-Impregnated Bimetal
  • Housing Bore: 1.994"
  • Shaft Dia.: 1.834"
  • Width: 0.782"

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 6L45, 6L50, 6L80, 6L90 Valve Body Layout

GM 6L45, 6L50, 6L80, 6L90 Valve Body Layout
  • 6L45, 6L50, 6L80, 6L90 Pump Bushing 104034A