• Downshift clunk
  • Firm shifts
  • Erratic EDS solenoid control and/or EDS codes


OE accumulator piston bumpers lose elasticity and take a set due to long term heat and fluid exposure.


The Sonnax accumulator piston kit restores optimal hydraulic shock absorption and OE functionality to all the solenoid regulated circuits.

6F35 (Gen. 1), 6F35 (Gen. 2), 6R140, 6R60, 6R75, 6R80, 845RE, CFT30, ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34, ZF8HP45, ZF8HP55, ZF8HP70

Accumulator Piston Kit
Part No. 95740-15K

Also fits Ford CFT23.

You need this if... View Instructions Find a Distributor

Overly firm up/downshift feel or harsh engagement can be a sign of deformed accumulator piston bumpers in listed units. The OE elastomeric (rubber) bumpers tend to take a set, resulting in loss of hydraulic damping. Sonnax accumulator piston kit 95740-15K restores hydraulic damping with improved service life.

  • Hardcoat anodized aluminum valve combats premature wear
  • New matching springs reproduce OE function
  • Direct replacement, no special tools required
Application Units Accumulators Needed
Chrysler 845RE 7
Ford 6F35 (Gen. 1) 1
Ford 6F35 (Gen. 2) 1
Ford 6R60/6R60 6*
Ford 6R140 3*
Ford CFT23 5
Ford CFT30 5
ZF6HP19/26/32 (Gen. 1) 6
ZF6HP21/28/34 (Gen. 2) 7
ZF8HP45/55/70 7
*NOTE: Sometimes these require 2.

  • Pistons (7)
  • Springs (7)

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

ZF8HP45, ZF8HP70 Valve Body Layout

Zf8hp45 70 vbl thumb

Ford CFT30 Valve Body Layout

Fd cft30 vbl

ZF6HP19/26/32 (Gen. 1) With 053 Separator Plate Valve Body Layout

Zf6hp 053 vbl thumb

ZF6HP19, ZF6HP26, ZF6HP32 (Generation 1) Valve Body Layout

Zf6hp19 vbl thumb

ZF8HP55 Valve Body Layout

Zf8hp55 vbl thumb

ZF6HP21/28/34 (Generation 2) Valve Body Layout

Zf6hp21 28 34 gen 2

  • 95740 15k combo
  • 95740 15k
  • 95740 15k details

You need this if...

The OE accumulator piston bumpers are worn, brittle or missing. Examine the bumpers closely for flat spots or cracks. Be sure that used bumpers quickly return to their original shape after deformation.