Symptoms:

  • Clutch slippage
  • Burnt clutches
  • Flare shifts
  • Ratio codes

Cause:

Wear at the accumulator piston bore allows clutch apply oil to exhaust.

Correction:

Restore hydraulic control by installing Sonnax drop-in 1-3-5-6-7 accumulator piston kit with O-ring for positive sealing in worn bores.

8L45, 8L90

1-3-5-6-7 Accumulator Piston Kit
Part No. 154740-15K

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

In GM 8L45 and 8L90 transmissions, the 1-3-5-6-7 accumulator piston is utilized during apply of the 1-3-5-6-7 clutches to smooth engagement. Wear at this bore allows 1-3-5-6-7 clutch apply oil to exhaust resulting in ratio codes, harsh or delayed application of the clutch pack, burnt clutches and slipping/flares. Installing Sonnax 1-3-5-6-7 accumulator piston kit 154740-15K eliminates leaks to restore normal shift operation and feel.

  • O-Ring incorporated for positive sealing, even in worn bores
  • Hardcoat anodized aluminum piston combats premature wear
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Piston
  • O-Rings (2) 1 Extra
  • Spring
  • Washer
  • 8L45, 8L90 1-3-5-6-7 Accumulator Piston Kit 154740-15K
  • 8L45, 8L90 1-3-5-6-7 Accumulator Piston Kit 154740-15K

You need this if...

8L45, 8L90 1-3-5-6-7 Accumulator Piston Kit Vacuum Test Locations