Symptoms:

  • Harsh downshifts
  • TCC apply & release concerns
  • TCC codes
  • Cycling TCC RPM
  • Overheated fluid

Cause:

Wear at the plunger/sleeve assembly results in the converter remaining applied and transferring shift shock. Loss of lube pressure and control timing also results in RPM fluctuation.

Correction:

The Sonnax lockup control plunger valve and sleeve kit corrects lost lube pressure and control timing issues caused by a worn OE plunger valve and sleeve.

A750E, A750F, A761E, A960E, A960F

Lockup Control Plunger Valve Kit
Part No. 147741-37K

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

Listed Toyota/Lexus transmissions can have complaints associated with a worn plunger valve and sleeve which includes harsh 2-3 and harsh coast downshifts. This is due to the converter clutch remaining applied. When the plunger valve and sleeve wear, this can delay TCC apply, the vehicle RPM may surge or set gear ratio codes due to high slip rates. Installing the Sonnax drop-in lockup control plunger valve and sleeve kit 147741-37K can restore correct lube pressure and valve control timing when bore wear at the lockup clutch control valve is not an issue.

  • Restores OE function
  • Drop-in components
  • No tools or reaming required
  • Valve
  • 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 A760E/F/H Series Valve Body Layout

Toyota A760E/F/H Series Valve Body Layout

Toyota/Lexus A750E/F Valve Body Layout

Toyota/Lexus A750E/F Valve Body Layout
  • A750E, A750F, A761E, A960E, A960F Lockup Control Plunger Valve Kit 147741-37K
  • A750E, A750F, A761E, A960E, A960F Lockup Control Plunger Valve Kit 147741-37K

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.

A750E, A750F, A761E, A960E, A960F Lockup Control Plunger Valve Kit Vacuum Test Locations