Symptoms:

  • Low line pressure
  • High line pressure
  • Poor shift quality
  • Low lube oil flow
  • Burnt clutches

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.

Warning:

Must measure EPC spool.

A340E, A340F

Oversized Pressure Regulator Valve Kit
Part No. 97741-06K

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


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

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

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.

Toyota/Lexus A340, A340E/F/H Valve Body Layout

Toyota/Lexus A340, A340E/F/H Valve Body Layout
  • A340E, A340F Oversized Pressure Regulator Valve Kit 97741-06K
  • A340E, A340F Oversized Pressure Regulator Valve Kit 97741-06K

You need this if...

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

A340E, A340F Oversized Pressure Regulator Valve Kit Vacuum Test Locations