Symptoms:

  • Low cooler flow
  • No converter apply
  • Low line pressure
  • Overheated converter
  • Overheated fluid

Cause:

Wear in the OE lube on demand regulating valve pump bore due to continuous oscillation results in converter feed pressure loss.

Correction:

Seal the bore and restore proper function by installing drop-in Sonnax lube on demand valve kit.

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40)

Lube On Demand Valve Kit
Part No. 144510-19K

You need this if... View Instructions Find a Distributor

In 2014, GM moved to Generation 3 on the 6T40 family, featuring a vastly different pump than previous generations. The pump moved to an off-axis, binary vane style design that reduces pump flow demands and torque requirements, aiding in better fuel economy. A lube on demand regulating valve has been added to the pump, allowing cooler/lube flow to double when converter feed is above 87psi. This highly active valve is a huge source of pump wear, opening a path for converter feed pressure to exhaust, resulting in converter apply issues, reduced line pressure and overheating.

Sonnax has developed a unique, patent-pending, drop-in solution that maintains the integrity of the OE design of double-flow at increased pressure, while mitigating any existing bore wear and preventing future pump casting degradation. Sonnax drop-in lube on demand valve kit 144510-19K reroutes fluid to a sleeved limit valve for proper cooler/lube flow and includes an O-ring to seal the path that previously allowed valuable converter feed pressure to exhaust.

  • Hardcoat anodized aluminum valve combats premature wear
  • Highly wear-resistant, billet sleeve seals bore from wear-related fluid loss and provides a new, unworn bore for the valve to operate within
  • O-Ringed sleeve stops leaks without requiring reaming
  • Drill and plug included to allow for quick rerouting of balance oil
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Valve
  • Sleeve
  • O-Rings (2) 1 Extra
  • Spring
  • Drill Bit Not Shown
  • Plugs (2) 1 Extra, For Separator Plate, Not Shown

  • 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Lube On Demand Valve Kit 144510-19K
  • 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Lube On Demand Valve Kit 144510-19K
  • 6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Lube On Demand Valve Kit 144510-19K details

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

6T31 (Gen. 3 6T40), 6T35 (Gen. 3 6T40), 6T41 (Gen. 3 6T40), 6T46 (Gen. 3 6T40), 6T51 (Gen. 3 6T40) Lube On Demand Valve Kit Vacuum Test Locations