Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Burnt brake clutches
  • Burnt clutches
  • Converter concerns
  • High line pressure
  • Low line pressure
  • Poor shift quality
Cause:

These complaints can be caused by continuous oscillation of the valve causing bore wear, allowing valuable line pressure and converter feed pressure to exhaust.

Correction:

Restore proper hydraulic control by refurbishing the bore and installing an improved and oversized Sonnax pressure regulator valve and new boost assembly to match ratios and OE pressure curves.

Tool Required VB-FIX Required

A340E, A340F

Oversized Pressure Regulator Valve Kit

Part No.

97741-06K

Oversized Pressure Regulator Valve Kit
  • 97741-06k_combo

  • Oversized Pressure Regulator Valve Kit

Small_97741-06k_combo Small_97741-06k

A340E, A340F

Oversized Pressure Regulator Valve Kit

Part No. 97741-06K

  • Pressure Regulator Valve
  • Pressure Regulator Spring
  • Boost Valve
  • Reverse Boost Valve
  • Boost Sleeve Replaces OE 2-dot boost sleeve

Fits type 3 and 4 valve bodies with .426" dia. EPC valve spool.

Complaint:

  • Burnt brake clutches
  • Burnt clutches
  • Converter concerns
  • High line pressure
  • Low line pressure
  • Poor shift quality

Cause:

These complaints can be caused by continuous oscillation of the valve causing bore wear, allowing valuable line pressure and converter feed pressure to exhaust.


Correction:

Restore proper hydraulic control by refurbishing the bore and installing an improved and oversized Sonnax pressure regulator valve and new boost assembly to match ratios and OE pressure curves.

Toyota A340E/F series transmissions may exhibit multiple line pressure and converter-related problems due to excessive wear in the main pressure regulator bore. Wear at the inboard balance spools allows critical line pressure fluid loss, resulting in excessively high pressure, harsh shifts and reduced cooler/converter flow. Wear at the outboard spools robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches and brakes. The Sonnax oversized pressure regulator valve kit 97741-06K for type 3 and 4 units allows the bore to be refurbished and the hydraulic integrity restored for proper line pressure in all ranges. The improved and oversized Sonnax pressure regulator valve is also paired with a new and improved boost valve assembly to maintain the correct pressure curves and restore typically worn OE hydraulic clearances at the critical EPC, Reverse and Cutback circuits within the assembly.

  • Sleeve is made from high-quality aluminum to reduce wear
  • Hardcoat anodized aluminum valves combat premature wear
WARNING:

Must measure EPC spool.

Required Tools

Related Parts

You need this if...

A vacuum test at the ports indicated fails to hold at least 18 in-Hg.

  • Test Locations

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 Toyota/Lexus A340E/F

Related Tech Articles

Contact a Sonnax Distributor to purchase this part.