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  • B5 Clutch distress
  • Harsh shifts
  • No 2-3
  • 2-3 Flare
  • Shift concerns
  • No lockup
  • Engine stall on engagement


Sleeve wear affects the position of the solenoid relay valve. Complaint depends on amount of solenoid modulator oil loss and in which position that valve may seize.


The tightly toleranced, drop-in replacement Sonnax valve and sleeve assembly restores proper hydraulic clearances and uses upgraded materials to prevent wear.

55-50SN, 55-51SN

Solenoid Relay Valve Kit
Part No. 59947-05K

Also fits AW55-51SN, AF 23/33 and RE5F22A units.

You need this if... View Instructions
  • Sleeve is manufactured from highly wear-resistant billet aluminum.
  • Valve is made from hard-coat anodized aluminum to prevent wear.
  • Salvages costly cores with minimal labor.
  • Eliminates the need for expensive OE valve bodies.
  • Valve
  • Sleeve

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Aisin AW 55-50SN Valve Body Layout

Aw55 50sn vbl thumb
  • 59947 05k combo
  • 59947 05k

You need this if...

A vacuum test of the sleeve assembly (while in the bore at the outboard solenoid modulator feed port indicated) gives less than 18" of vacuum, or if a Wet Air Test at the same location results in leakage at the neighboring exhaust port on the opposite side of the casting

  • 59947 05k test