Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Harsh downshifts
  • Overheated fluid
  • RPM surge on coast
  • TCC apply & release concerns
  • TCC codes
Cause:

Wear at the lockup control valve 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 oversized lockup control plunger valve and sleeve kit corrects lost lube pressure and control timing issues caused by a worn OE plunger valve and sleeve.

Tool Required VB-FIX Required

A750E, A750F, A760E, A760F, A760H, A761E, A960E, A960F

Oversized Lockup Control Valve Kit

Part No.

147741-16K

Oversized Lockup Control Valve Kit
  • 147741-16k_combo

  • Oversized Lockup Control Valve Kit

Small_147741-16k_combo Small_147741-16k__1_

A750E, A750F, A760E, A760F, A760H, A761E, A960E, A960F

Oversized Lockup Control Valve Kit

Part No. 147741-16K

  • Lockup Control Valve
  • Plunger Valve
  • Plunger Sleeve

Complaint:

  • Harsh downshifts
  • Overheated fluid
  • RPM surge on coast
  • TCC apply & release concerns
  • TCC codes

Cause:

Wear at the lockup control valve 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 oversized lockup control plunger valve and sleeve kit corrects lost lube pressure and control timing issues caused by a worn OE plunger valve and sleeve.

Toyota/Lexus A750, A760 and A960 series transmissions can have harsh 2-3 and harsh coast downshift complaints associated with bore wear at the lockup control valve. This is due to the converter clutch remaning applied. When bore wear delays TCC apply, the vehicle RPM may surge or set gear ratio codes due to high slip rates. Installing the Sonnax oversized lockup control valve, plunger valve and sleeve kit 147741-16K can restore correct lube pressure and valve control timing.

  • Restores correct lube pressure
  • Re-establishes valve control timing

Required Tools

You need this if...

A vacuum test at any port indicated fails to hold the recommended in-Hg of vacuum or higher, or if visual wear is detected.

  • Test Locations

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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 A760E/F/H Series
Valve Body Layout Toyota A750E/F Series

Related Tech Articles

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