Symptoms:

  • Code P0751
  • 1-2-3-4 Clutch burned
  • 3-5-Reverse clutch burned
  • Cruise control disabled

Cause:

These symptoms can be caused by faulty OE clutch select valve springs setting the valve apply pressure too high.

Correction:

The Sonnax springs reduce the apply pressure needed to move the clutch select valves, reducing the tendency of the P0751 code to set.

Warning:

Do NOT use this spring kit or one of the updated OE plates in late (mid 2010-later) valve bodies. See instructions for details.

6L45, 6L50, 6L80, 6L90

Clutch Select Valve Spring Kit
Part No. 104740-02K

Mid 2010-Earlier

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

Mid 2010-earlier GM 6L45–6L90 applications have a tendency to set a P0751 (shift solenoid 1 malfunction) code. One of the causes of this is the OE spring force at the clutch select valves inhibiting movement of the valves, affecting proper control of clutch apply fluid.

Early-model production has updates made to reduce the spring force, however the updated springs are not available separately from OE, only as part of a new and expensive lower valve body.

Sonnax clutch select valve spring kit 104740-02K updates these springs to the correct lower load to prevent the P0751 code.

  • No special tools required
  • Avoids expensive lower valve body replacement

Additionally, updates were made to the OE separator plate to further improve clutch feed pressure, clutch backfill exhaust pressure and compensator feed pressure.

If the unit's separator plate is NOT the updated version, Sonnax recommends replacing the plate with the updated version when using this spring kit.

See instructions for details.

  • Springs (2)

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.

GM 6L45, 6L50, 6L80, 6L90 Valve Body Layout

GM 6L45, 6L50, 6L80, 6L90 Valve Body Layout
  • 6L45, 6L50, 6L80, 6L90 Clutch Select Valve Spring Kit 104740-02K
  • 6L45, 6L50, 6L80, 6L90 Clutch Select Valve Spring Kit 104740-02K

You need this if...

The OE springs at the clutch select valves match the specifications shown below.

OE Clutch Select Valve Spring Specifications
Outside Diameter .346"
Wire Diameter .032"
Free Length .944"
Total Coils 8.5