Bush Kit for ZF 8 Speed Transmissions

Bush Kit for ZF 8 Speed Transmissions

PART  # 121401K
Fits 8HP45, 8HP50, 8HP55, 8HP70, 8HP75 and 845RE


  • Bush wear
  • Bush failure
  • Clutch failure
  • Harsh shifts
  • Gear ratio & solenoid codes


Premature wear due to sub-optimal OE bushing material in ZF 8-speed units allows fluid loss and misalignment that results in harsh shifting and clutch failure.


The Sonnax parts restore hydraulic integrity and provide a positive seal with the pump bore. The Sonnax boost valve kit restores hydraulic integrity and provides a positive seal with the pump bore.

OE bushings in Chrysler 845RE and listed ZF 8-speed units have a tendency to wear out prematurely due to sub-optimal material composition. This wear can lead to bushing failure, harsh shifts, burnt clutches and gear ratio or solenoid codes. The Sonnax improved bushing kit restores worry-free operation.

  • Upgraded material composition outperforms OE bushings
  • Superior wear characteristics eliminate premature deterioration


  • "A" Hub Front Bush
  • "A" Hub Rear Bush
  • P1 Planet Bush Fits 1.812" housing bore dia.
  • P1 Planet Bush Fits 1.811" housing bore dia.
  • P4 Front Sun Gear Bush
  • P4 Rear Sun Gear & Planet Carrier Bushes (2) Fits rear of P4 sun gear and P4 planet carrier locations
  • Front Stator Support Bush


  • Material: Steel-backed alloy
  • Bush Style: Precision


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