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Supported Servo Pin & Cover Kit
Part No. 28821-19K

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Conventional Powerglide servos are not well-supported. At high apply pressures or with a worn servo pin bore, the servo piston is side-loaded in the case, causing friction and binding of the piston. The unique Sonnax supported servo pin and cover kit 28821-19K eliminates friction caused by side-loading and ensures the servo piston will apply and release without binding.

  • Unique design eliminates piston binding that causes unexplained band failure
  • Low-drag O-ring prevents high gear & release oil pressure bore leaks
  • Compatible with all OE and aftermarket Powerglide servo pistons
  • Supported Servo Pin
  • Supported Servo Cover
  • Shims (2)
  • Retaining Clip
  • Gasket
  • Pin O-Ring
  • Cover O-Ring
  • Plug Not shown
  • Bolts (3) Not shown

April 27, 2016

Understanding & Overcoming the Powerglide Servo Pin Bias Effect - Part 1

Topics: Diagnostics And Theory Transmission GM Powerglide Transmission

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