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Sonnax Signal Accumulator Pistons

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. Sonnax drop-in signal accumulator piston kits allow 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. Features include: * 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 * Available for a variety of Chevrolet, GMC, and Cadillac transmission applications Kit contents: -- Sleeves (4) -- Pistons (4) -- Springs (4) -- O-rings (6), 2 extra -- End plugs (4)

5.0 out of 5 stars ( 1 )

$47.48

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Sonnax Pinless Accumulator Piston Kits

Wear at the piston pin bore surface can result in poor shift quality and burnt clutches and bands. Sonnax pinless accumulator piston kits prevent pin bore leakage. They're also longer to stabilize the piston and prevent piston cocking. They feature dual seals to stabilize and completely seal the bore, and steel balls to plug the existing pin bore. Fluid loss through the piston pin bore will no longer be an issue when you invest in Sonnax piston kits.

5.0 out of 5 stars ( 18 )

$8.94

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$10.86

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Sonnax Automatic Transmission Servo Pistons

Maintaining your transmission can save you from costly replacement bills. Sonnax automatic transmission replacement servo pistons feature a dual-seal design and can be used with one or two PTFE or OEM-style cast seals. Accompanying replacement components are also available from Sonnax.

Not Yet Reviewed

$12.24

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$62.58

FTI Performance Powerglide Reverse Pistons

FTI Performance powerglide reverse pistons will help you strengthen the durability in your transmission. These high-quality billet pistons are designed to hold up to the high-horsepower your street/strip engine puts out.

5.0 out of 5 stars ( 2 )

$49.99

TransGo Automatic Transmission Accumulator Pistons

These TransGo automatic transmission accumulator pistons are designed to replace the original plastic accumulators that break or crack after prolonged use. They are manufactured from aluminum and machined to precise specifications for a simple bolt-in installation.

4.77 out of 5 stars ( 22 )

$9.00

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$94.00

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Sonnax Billet Accumulator Pistons

Sonnax billet accumulator pistons feature a stronger piston made from anodized billet aluminum with a dual-seal design. OEM plastic accumulators are prone to breaking and have poor sealing qualities and the metal rings currently offered with aftermarket accumulators also have issues with sealing. Sonnax piston's seals prevent piston-to-bore contact and the D-rings vastly improve sealing compared to aftermarket steel rings.

4.38 out of 5 stars ( 8 )

$45.90

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$117.95

Sonnax Accumulator Pistons

Noticing some forward slip and/or delayed engagement with your GM automatic transmission? Sonnax accumulator pistons are direct replacements for OE plastic pistons and restore sealing integrity at the pin bore. The aforementioned issues, as well as burnt clutches and bands can be caused by loss of fluid. Deterioration at older aluminum piston pin bores due to repeated reciprocation and/or cracks in plastic accumulator pistons may be the cause. Avoid a costly valve body replacement by ordering a Sonnax accumulator piston.

5.0 out of 5 stars ( 2 )

$7.91

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$17.84