Tool Required VB-FIX Required
- 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
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.
Recover hydraulic control and renew performance by reconditioning the bore and installing the Sonnax oversized primary pressure regulator and reverse boost valve kit.
Oversized Primary Pressure Regulator & Reverse Boost Valve Kit
- Pressure Regulator Valve
- Boost Valve
- Boost Sleeve
- Cup Plugs (2) 1 Extra
Kit can be used to replace either OE ratio.
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
You need this if...
Vacuum tests at the ports indicated fail to hold at least 18 in-Hg.
Click here to view PDF if instructions do not appear below.
Valve Body Layouts
Related Tech Articles