519 453 4318

Supported Servo Master Kit

"Mystery" band failures are a common result of aftermarket servo return springs and weak OE springs prone to collapse that do not reliably release the servo. The Sonnax spring in this kit is race-calibrated to ensure consistent servo function for longer band life and a cooler transmission. The spring's higher seat pressure helps ensure full servo release, but also features a lower spring rate to prevent excessive release force in the apply position.


  • Unique cover and pin combination eliminates piston binding that causes unexplained band failure
  • Race-calibrated spring counteracts pin bias effect up to 275 psi
  • Dual PTFE seal rings for better seal and low friction
  • OE apply area
  • Low-profile design ensures adequate clearance
  • 6061 Anodized billet aluminum cover



Item #


Prices in USD.

- Prices are subject to change without notice.

- Email for quotes on goods needed.

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Hutch Transmissions | 425 First St, London, ON N5W 5K5

Phone: (519) 453 4318

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