BUSH KIT SONNAX(8HP45/50/55/70/75/845RE)
# 121401K

Bush Kit, Sonnax

BUSH KIT SONNAX(8HP45/50/55/70/75/845RE)

Caution: Use of an arbor press is required for correct installation. Do not use a hydraulic press or a bushing driver/hammer combination to install, as doing so may distort the bushing and cause fitment issues.


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


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

SONNAX Installation Instructions

Type of Product: Bush Kits
Qty Needed:
Alternative #:
Availability: 5, 5, 5