Transmission Parts Ford 4R70E 4R70W 4R75E 4R75W Case Spring
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Symptoms:

  • Soft shifts
  • 1-2 Slip
  • Broken spring

Cause:

Worn or weakened OE accumulator springs may cause delayed or sluggish shifts between 1st and 2nd Gears.

Correction:

Restore shift feel, even in demanding towing applications, by installing upgraded Sonnax 1-2 accumulator springs.

4R70E, 4R70W, 4R75E, 4R75W

Heavy Duty 1-2 Accumulator Spring Kit
Part No. 76948-10K

Fits '07-later units.

OE Part No. 1L3Z-7F284-AA & 1W7Z-7F284-AA

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In Ford 4R70E, 4R70W, 4R75E and 4R75W transmissions used for heavy-duty or towing applications, soft shifts and 1-2 slips are common. This happens when the OE 1-2 accumulator springs weaken, break, or are not calibrated to withstand the demands of heavy-duty use.

Installing Sonnax heavy duty 1-2 accumulator spring kit 76948-10K restores shift feel and improves overall performance, reliability and longevity of 4R70W series transmissions.

  • Specially designed inboard and outboard accumulator springs provide a firmer and more responsive 1-2 upshift, ensuring optimal performance even under heavy loads
  • Stronger-than-OE springs enhance transmission durability and reliability.

Provides firmer shifts in heavy duty/towing applications. Only use the two springs included in this kit. Some OE applications have a blue inner spring that is NOT used with this kit.

  • Inboard Spring Green
  • Outboard Spring Yellow
  • 4R70E, 4R70W, 4R75E, 4R75W Heavy Duty 1-2 Accumulator Spring Kit 76948-10K
  • 4R70E, 4R70W, 4R75E, 4R75W Heavy Duty 1-2 Accumulator Spring Kit 76948-10K
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