Shift Zip Kit

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TCC Zip Kit

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Pressure Regulator & Shuttle Valve Kit

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Signal Accumulator Piston Kit

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.

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1-3-5-6-7 Accumulator Piston Kit

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

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O-Ringed End Plug Kit

OE end plugs are designed to prevent critical pressure loss by capping the bore, while also functioning as a spring or valve stop. Repetitive spring motion, valve impact and fluid pressure variations cause wear between the end plug and bore mating surface, allowing vital fluid to escape the circuit.

Wear at various OE end plugs in GM 8L45 and 8L90 transmissions allows critical leakage at the following circuits, default override, lube flow regulation, and converter lockup/release. These pressure losses impair control of clutches, effect lube flow regulation and critical converter control.

Put an end to leaks, restore hydraulic integrity and renew shift operation by installing Sonnax O-ringed end plug kit 154740-17K.

• Minimal end plug-to-bore clearance with added O-ring for positive seal
• Reduces or eliminates leakage in eroded bores
• Drop-in Zip Valve™ parts install quickly and easily

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Superior STL010