Seller notes

Powerglide, TH400High RPM Checkball CapsulePart No. 57510-01Retrofits into existing pistons/drums.Package Quantity: 1 Sonnax high RPM checkball capsule 57510-01 is specially calibrated to prevent pressure drops in high RPM GM TH400 and Powerglide racing applications. Testing has shown that OE checkballs are unreliable above 5500 RPM. At higher speeds the checkballs can unseat, resulting in drop of line pressure or converter pressure. Variables that effect checkball performance include: diameter ...

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