SERVO SUPER HOLD (POWERGLIDE)
# 31575K

SERVO SUPER HOLD (POWERGLIDE)

Sonnax super hold servo kit 28821-09K is an all-in-one upgrade ideal for a competitive edge in GM Powerglide applications where racers are looking to reduce line pressure to free up horsepower. The kit's dual piston design features 30% more apply area to increase band apply force at your current line pressure or allow you to reduce line pressure by 20% to 30% while maintaining the same apply force.

  • Dual piston design for 30% more apply area
  • Spring counteracts pin bias effect up to 275 psi
  • Improved sealing throughout
  • Low-profile design ensure adequate clearance
  • 6061 Anodized billet aluminum cover

Contents:

  • Servo Assembly
  • Cover Gasket
  • Case-to-Cover O-Ring
  • Return Spring
  • Servo Pin Seals (2) PTFE, 1 extra
  • Primary Piston Seals (2) PTFE

SONNAX Installation Instructions


Sonnax Super Hold Servo Kit - 28821-09K

Type of Product: Pistons
Years: