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NaslovnaKatalogGM General MotorsValve 1-2 & Rev.Boost 4T60E

Valve 1-2 & Rev.Boost 4T60E

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Valve 1-2 & Reverse Boost 4T60E

  • Valve
  • Long Spring
  • Short Spring
  • Coiled Spring Pin

Fits either of 2 locations

The continuous stroking of the 1-2 (forward) and reverse servo boost valves wear away at the valve bore, creating excess clearance and reduced apply pressures. This can lead to 1-2 band slippage, delayed engagements, 1-2 shift flares, and decreased reverse pressure. Sonnax has developed an oversized valve 84754-40K that will restore the hydraulic integrity and more than doubles the valve-to-bore contact area to prevent leakage.


1-2 Band burned
1-2 Flare Delayed engagement
Low Reverse pressure


These complaints may be caused by the continuous reciprocation of the 1-2 (forward) and reverse servo boost valves wearing the valve body bores.


This oversized, hard-coat anodized aluminum valve restores hydraulic integrity, and has increased valve-to-bore contact to prevent leakage. This valve requires the use of a Sonnax reaming tool kit.

NOTE: This kit only contains one valve. If both bores need to be repaired, two kits are required.

Required tools:

Reamerkit 4T60E, 4T65E 1-2/Rev: 84754-TL2

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GM General Motors

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