Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Burnt brake clutches
  • Burnt clutches
  • Clutch slippage
  • Erratic shifts
  • Harsh shifts
  • High line pressure
  • High line pressure in Reverse
  • Low converter pressure
  • Low line pressure
  • Low line rise
  • Soft shifts
Cause:

Continuous oscillation of the pressure regulator valve causes bore wear, which results in line pressure deviation and valve instability. Reverse boost sleeve wear allows reverse pressure and SLT oil leakage.

Correction:

Recover hydraulic control and renew performance by reconditioning the bore and installing the Sonnax oversized primary pressure regulator and reverse boost valve kit.

Tool Required VB-FIX Required

U660E, U660F, U760E, U760F

Oversized Primary Pressure Regulator & Reverse Boost Valve Kit

Part No.

47740-02K

Oversized Primary Pressure Regulator & Reverse Boost Valve Kit
  • 47740-02k_combo

  • Oversized Primary Pressure Regulator & Reverse Boost Valve Kit

Small_47740-02k_combo Small_47740-02k

U660E, U660F, U760E, U760F

Oversized Primary Pressure Regulator & Reverse Boost Valve Kit

Part No. 47740-02K

  • Pressure Regulator Valve
  • Boost Valve
  • Boost Sleeve
  • Cup Plugs (2) 1 Extra
  • Spring

Kit can be used to replace either OE ratio.

Complaint:

  • Burnt brake clutches
  • Burnt clutches
  • Clutch slippage
  • Erratic shifts
  • Harsh shifts
  • High line pressure
  • High line pressure in Reverse
  • Low converter pressure
  • Low line pressure
  • Low line rise
  • Soft shifts

Cause:

Continuous oscillation of the pressure regulator valve causes bore wear, which results in line pressure deviation and valve instability. Reverse boost sleeve wear allows reverse pressure and SLT oil leakage.


Correction:

Recover hydraulic control and renew performance by reconditioning the bore and installing the Sonnax oversized primary pressure regulator and reverse boost valve kit.

Toyota/Lexus vehicles equipped with U660E/F, U760E/F units commonly exhibit a number of symptoms related to line pressure instability. A few of these concerns are poor line rise and clutch/brake slippage, higher than normal pressures in reverse, erratic shifts and low converter feed pressure. These issues can frequently be traced to excess wear in the primary pressure regulator valve bore. To address these problems and restore full hydraulic control, Sonnax offers oversized primary pressure regulator and reverse boost valve kit 47740-02K.

  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves on the valve help center it in the bore to reduce future side-load wear
  • Wear-resistant aluminum boost sleeve
  • Dual-ratio reverse boost valve assembly can be used with either OE ratio
  • Patent No. 9,447,871

Required Tools

You need this if...

Vacuum tests at the ports indicated fail 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 U660E/F, U760E/F

Related Tech Articles

Contact a Sonnax Distributor to purchase this part.