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.

The Sonnax drop-in signal accumulator piston kit 154740-06K allows bores to be reconditioned quickly and easily with no reaming required. The hydraulic integrity of the VFS signal pressure circuits are re-established, and future wear prevented with positive sealing and wear resistant components.

• Hardcoat anodized aluminum piston combats premature wear
• Annular grooves to reduce wear rate
• Highly wear-resistant sleeve to prevent future wear
• Positive sealing O-ringed plug prevents leakage in already worn bores
• Mating spring to re-establish OE dampening action
• Drop-in Zip Valve™ parts install quickly and easily