• 4th Clutch burned
  • 4th Slip
  • Bushing failure
  • Bushing wear
  • No 4th
  • No Reverse
  • Reverse slip


OE bushing material composition allows premature bushing wear.


Restore critical clearances and resist untimely bushing wear by installing improved material Sonnax center support bushing.


Center Support Bushing
Part No. S29506468

Fits Allison AT-540/542/543/545/1542/1545

OE Part No. 29506468

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OE center support bushings in listed Allison® AT units tend to wear out prematurely due to sub-optimal material composition. This wear can lead to bushing failure, slipping/no Reverse, slipping/no 4th, and burnt 4th range clutches. Sonnax center support bushing S29506468 features superior wear characteristics, eliminating premature deterioration for trouble-free operation.

  • Direct fit, no machining necessary
  • Upgraded material composition for increased wear resistance
  • Material: Bimetal
  • Bushing Style: Precision
  • Housing Bore: 1.598"
  • Shaft Dia.: 1.466"
  • Width: 1.850"
  • AT-500 Center Support Bushing S29506468