Powerglide Performance HP Billet Piston and Spring Kit - Reverse Clutch 1962-73 | Sonnax 28761-01K

Powerglide Performance HP Billet Piston and Spring Kit - Reverse Clutch 1962-73 | Sonnax 28761-01K

S103976K + S103966D

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$139.50
$139.50
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Heavy Duty Reverse Clutch Piston and Springs Combo Kit
Piston Kit # 28761-01K -and- Spring Kit # 28320A

Aluminum Case Powerglide 1963-73

Sonnax heavy duty reverse clutch piston kit 28761-01K for GM Powerglides is configured to utilize four frictions and five steels. It can also be machined to accept additional frictions and steels for transbrake applications. To reduce rotating weight in circle track applications, two frictions (rotating) and seven steels (non-rotating) can be used.

  • High-strength piston will not break at racing pressures
  • Customizable for any application

Contents:

  • Piston
  • Inner Seal
  • Outer Seal

Specs:

  • 6061-T6 Billet Aluminum

Heavy Duty Reverse Clutch Return Spring
Part No. 28320A

Package Quantity: 17

Sonnax heavy duty reverse clutch return spring 28320A improves the release rate of the transbrake-equipped GM Powerglide. Packaged in kits of 17 springs, all spring ends are close-wound to prevent arch deflection and then match ground to a uniform length to ensure equal load distribution among all the springs in the clutch assembly. These springs are made from high tensile spring wire to slow loss from fatigue. Engineered by Sonnax specifically to meet the requirements of transbrake drag racers, these springs offer improvement over the OE and any commercially available springs.

  • Consistent and reliable transbrake release rate
  • Longer life through better materials