Symptoms:

  • 1-2 Bump
  • 3-4 Bump
  • Soft shifts
  • Harsh shifts

Cause:

Accumulator bore wear and/or piston sticking.

Correction:

Prevent leakage of worn valve body castings with this O-ringed accumulator piston and spring kit.

CD4E, LA4A-EL

2-4 Accumulator Piston Kit
Part No. 73840-24

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

Ford CD4E and Mazda LA4A-EL transmissions may exhibit such problems as harsh engagements, and/or soft or harsh shifting, particularly from 1st to 2nd Gear. These complaints can be due to worn or out-of-round accumulator bores and/or pistons sticking in the bore. Sonnax accumulator piston kit 73840-24 for the 2-4 piston, 73840-LR for Low/Reverse and 73840-FWD for Forward.

  • Anodized aluminum pistons have two O-rings that prevent blow-by leakage
  • Pistons have been dimensionally modified to stop in different axial locations to prevent them from hanging up or sticking on the previously worn bore edges
  • Modified replacement springs are included to fit the smaller piston pocket
  • Kits available for 2-4, Low/Reverse and Forward locations
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Piston
  • Spring White
  • O-Rings (2) Viton®
  • Rivet 1/4" Large Head, Aluminum

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.

Ford CD4E Valve Body Layout

Ford CD4E Valve Body Layout
  • CD4E, LA4A-EL 2-4 Accumulator Piston Kit 73840-24
  • CD4E, LA4A-EL 2-4 Accumulator Piston Kit 73840-24

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

CD4E, LA4A-EL 2-4 Accumulator Piston Kit Vacuum Test Locations