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  • Soft shifts
  • Long soft shift in towing & heavy-duty applications


Broken, weak or collapsed accumulator springs.


Replace accumulator springs with Sonnax improved shift feel accumulator spring kit.

4R100, E4OD

Performance Rated Accumulator Spring Kit
Part No. 36948-18K

View Instructions

The OE E4OD and 4R100 accumulator springs can break, weaken or collapse, causing long, soft shifts, particularly in towing and heavy-duty applications.

  • Best in heavy-duty and towing applications.
  • Gives quicker and firmer 1-2, 2-3 and 3-4 shifts.
  • Recalibrates shift feel.

For best results, use in conjunction with Sonnax line pressure modulator valve 96948-01K for heavy-duty/high performance applications.

  • Retaining Clips (3)
  • Green Springs (2)
  • Yellow Spring
  • Medium Red Springs (3)
  • Non-Painted Springs (3)
  • 36948 18k combo
  • 36948 18k