Symptoms:

  • Soft Reverse
  • Harsh Reverse
  • Delayed Reverse

Cause:

Accumulator bore wear and/or piston sticking.

Correction:

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

CD4E, LA4A-EL

Low/Reverse Accumulator Piston Kit
Part No. 73840-LR

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
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Piston
  • Spring Purple
  • Spring Pink
  • Spring Black
  • O-Rings (2)
  • Rivet Not Shown

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 Low/Reverse Accumulator Piston Kit 73840-LR
  • CD4E, LA4A-EL Low/Reverse Accumulator Piston Kit 73840-LR

You need this if...

A vacuum test at either port indicated fails to hold 18" of vacuum or higher, or if visual wear is detected at the inboard overlap valve bores.

CD4E, LA4A-EL Low/Reverse Accumulator Piston Kit Vacuum Test Locations