Transmission Parts

Browse all Sonnax transmission parts here, or use the filters below to find just what you are looking for.

Find a Distributor

View Sonnax Part Instructions

Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.

5R55S, 5R55W Remanufactured Solenoid Block 56954L-RRP

5R55S • 5R55W

Remanufactured Solenoid Block 56954L-RRP

Fits '04-later. If supplying a core for your solenoid, please order 56954L-RRP. If no core available, please order 56954L-C.

    Helps cure:
  • Shift concerns
5R55S, 5R55W Pressure Regulator Valve 56947J-77

5R55S • 5R55W

Pressure Regulator Valve 56947J-77

    Helps cure:
  • Delayed engagement
  • Soft shifts & poor line rise
  • Erratic buzz
  • Harsh shifts
  • Pressure control out-of-range codes
  • High line pressure in Reverse
  • Erratic line pressure
  • Burnt clutches
5R55S, 5R55W Boost Valve Kit 56947J-74K

5R55S • 5R55W

Boost Valve Kit 56947J-74K

    Helps cure:
  • No Reverse
  • Reverse slip
  • Low Reverse boost
  • Delayed engagement
  • Soft shifts
  • Poor shift quality
  • Low line rise
  • Erratic line pressure
  • Burnt clutches
  • Poor fuel economy
5R55N, 5R55S, 5R55W Pinion Washer 46580A-W

5R55N • 5R55S • 5R55W

Pinion Washer 46580A-W

Fits .551" dia. pinion pins.

  • Material: Bronze
  • Thickness: 0.020"
    Helps cure:
  • Lost or damaged component
5R55N, 5R55S, 5R55W Pinion Washer 46580-W

5R55N • 5R55S • 5R55W

Pinion Washer 46580-W

Fits .452" dia. pinion pins.

  • Material: Bronze
  • Thickness: 0.020"
    Helps cure:
  • Lost or damaged component
↑