Printpartsummary
Symptoms:
  • Erratic shifts
  • Gear ratio & solenoid codes
  • No 3rd when hot
  • No 4th when hot
  • Shift timing change with temperature
Cause:

Wear of bore end plugs allowing solenoid feed oil to exhaust.

Correction:

The Sonnax kit contains O-ringed end plugs to positively seal the bores.

4R44E, 4R55E, 5R44E, 5R55E

O-ringed End Plug & Checkball Kit

Part No.

37947-13K

O-ringed End Plug & Checkball Kit
  • O-ringed End Plug & Checkball Kit

Small_37947-13k

4R44E, 4R55E, 5R44E, 5R55E

O-ringed End Plug & Checkball Kit

Part No. 37947-13K

  • Small End Plugs (2)
  • Large End Plug
  • Small O-Rings (5) 1 Extra
  • Large O-Rings (3) 1 Extra
  • Checkballs (4) not shown
  • L Retaining Pins (4) not shown

Complaint:

  • Erratic shifts
  • Gear ratio & solenoid codes
  • No 3rd when hot
  • No 4th when hot
  • Shift timing change with temperature

Cause:

Wear of bore end plugs allowing solenoid feed oil to exhaust.


Correction:

The Sonnax kit contains O-ringed end plugs to positively seal the bores.

The end plugs at the kick downshift control, manual low, and throttle downshift control valves become loose. This allows solenoid feed oil to exhaust and drop below 40-45 psi, which prevents the shift valves from stroking fully. The Sonnax kit 37947-13K contains o-ringed end plugs for these three locations, which positively seal the circuit to prevent oil loss.

  • O-ringed end plugs positively seal the circuit to prevent oil loss.
  • End plugs have threaded ends for ease of installation and removal.
  • Kit contains 4 Torlon® checkballs to replace lost or damaged originals.
  • Kit contains 4 L shaped retainer pins to replace lost originals.

Click here to view PDF if instructions do not appear below.

It appears you don't have a PDF plugin for this browser. Click here to view the PDF file.

Valve Body Layouts

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.

Valve Body Layout Ford 4R/5R44E, 4R/5R55E
Contact a Sonnax Distributor to purchase this part.