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  • High line pressure
  • Low base line pressure
  • Soft shifts
  • Delayed engagement


Circuit wear, relaxed OEM pressure regulator springs or overly aggressive aftermarket springs.


The Sonnax spring is designed to restore or increase line pressure up to 10 psi over OEM specifications while avoiding excessively high line pressure and harsh shifts.

5R55S, 5R55W

Elevated Pressure Main Pressure Regulator Spring
Part No. 56947J-S7

Package Quantity: 5

  • Restores or increases line pressure up to 10 psi.
  • Replaces lost original springs.
  • No harsh shift effects of high line pressure.
  • Drop-in installation requires no modifications.
  • 56947j s7 combo
  • 56947j s7