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  • 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, AT 542, AT 543, AT 545, AT 1542 & AT 1545

OE Part No. 29506468

View Instructions

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"

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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  • S29506468