Transmission Parts GM 6L90 6L80 Valve Body Valve / Sleeve
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Symptoms:

  • Delayed engagement
  • Flare shifts
  • 4-5-6 Clutch burned
  • Poor shift quality

Cause:

Oscillation of the CBR1/4-5-6 clutch regulator valve causes valve wear that prevents proper hydraulic actuation of the CBR1/4-5-6 clutches.

Correction:

Recover hydraulic control and renew shift performance by installing Sonnax drop-in CBR1/4-5-6 clutch regulator valve.

6L90, 6L80

CBR1/4-5-6 Clutch Regulator Valve
Part No. 104740-50

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In GM 6L80 and 6L90 transmissions, the CBR1/4-5-6 clutch regulator valve moves based on a combination of solenoid and spring pressure on one end, and clutch feedback pressure on the other. Depending on driving conditions, these forces shift the valve to direct line pressure to the appropriate clutch, enabling either Low, Reverse, 4th, 5th, or 6th Gears.

As the valve oscillates and strokes over time, the valve wears out, which allows fluid leakage causing delayed engagement in Low or Reverse and flared upshifts to 4th, 5th and 6th Gears, burnt clutches and poor shift quality. Installing Sonnax CBR1/4-5-6 clutch regulator valve 104740-50 restores normal shift operation by re-establishing the hydraulic integrity of the CBR1/4-5-6 circuit.

  • Hardcoat anodized aluminum valve combats premature wear
  • Drop-in Zip Valve™ installs quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • 6L80, 6L90 CBR1/4-5-6 Clutch Regulator Valve 104740-50
  • 6L80, 6L90 CBR1/4-5-6 Clutch Regulator Valve 104740-50

You need this if...

6L80, 6L90 CBR1/4-5-6 Clutch Regulator Valve Vacuum Test Locations
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