Product Description
2019-UP UNITS ONLY!
Tooling Required: 15740-TL
GM 8L45 and 8L90 transmissions often suffer burnt clutches, shift concerns, low line pressure and/or converter apply complaints due to excess wear in the signal accumulator piston bores in the control solenoid valve body casting. This wear allows valuable VFS signal pressure to exhaust, preventing proper shift control, line pressure regulation and/or converter clutch apply.
Reconditioning these bores and installing Sonnax oversized signal accumulator piston kit 154740-01K re-establishes correct clearance for proper VFS signal pressure.
- Hardcoat anodized aluminum pistons combat premature wear
- Annular grooves reduce wear rate
Contents
- (7) Accumulator Pistons
Symptoms
- Poor shift quality
- Low line pressure
- No converter apply
- Hydraulic-related converter codes
- Burnt clutches
- Soft shifts
Cause
Wear in the signal accumulator piston bores of the control solenoid valve body casting allows valuable VFS signal pressure loss. This pressure is used to help control shift feel, regulate line fluid pressure and control pressure of the converter clutch control valve.
Correction
Restore hydraulic control by reconditioning the bores and installing Sonnax oversized signal accumulator piston kit.
