Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax Transmission
Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax Transmission
Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax Transmission

Boost Valve Kit, for 55-50SN, 55-51SN, Sonnax Transmission

  • Sale
  • $60.15

Symptoms:

  • Delayed Reverse
  • Erratic Reverse pressure
  • Delayed Drive
  • Soft upshifts
  • Harsh upshifts

Cause:

The valve within the sleeve separates reverse boost oil from throttle signal (SLT) oil. Pressure in reverse can either be delayed or added to SLT, which results in very high reverse pressure. If the sleeve is worn and selector is not in Reverse, SLT is allowed to vent at the manual valve, reducing line rise, which affects engagements and shift quality.

Correction:

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

Boost Valve Kit
Part No. 59947-07K

  • Sleeve is manufactured from highly wear-resistant billet aluminum.
  • Valve is made of hard-coat anodized aluminum to prevent wear.

Also fits AW55-51SN, AF 23/33 and RE5F22A units. The 59947-07K should not be usedwith Sonnax oversized pressure regulator valve 59947-12K.

  • Valve
  • Sleeve
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