Listed transmissions may exhibit no line rise and/or line pressure instability due to a broken isolator valve spring. The isolator valve is in the main line pressure circuit and acts as a damper to smooth pulses from the pressure control solenoid. When this spring breaks, the end plug can shift toward the middle of the valve body, allowing unrestricted exhaust for main line pressure. Spring breakage can also cause isolator valve to jam in the bore, preventing the dampening effect that protects against line pressure instability. Installing Sonnax isolator valve spring 124740-16 restores normal line pressure operation. The spring is shot-peened to reduce spring fatigue and eliminate premature failure.

More From This Category

MANLEY Valve Spring Retainer, Steel, 7 Degree, 1.437 in. OD, Set of 16

MANLEY Valve Spring Retainer, Steel, 7 Degree, 1.437 in. OD, Set of 16

$140.86

Sonnax Shim, Chrysler, 40Te/S, 41Ae/Te, 41Te/S, 42Le,

Sonnax Shim, Chrysler, 40Te/S, 41Ae/Te, 41Te/S, 42Le,

$15.28

MANLEY Valve Spring Retainer, Titanium, Super 7 Degree, 1.500 in. OD, Double, Lightweight, Set of 16

MANLEY Valve Spring Retainer, Titanium, Super 7 Degree, 1.500 in. OD, Double, Lightweight, Set of 16

$890.07

COMP Cams Valve Spring, Dual, 1.625 in. O.D, 630 lbs./in. Rate, 1.090 in. Coil Bind Height, Each

COMP Cams Valve Spring, Dual, 1.625 in. O.D, 630 lbs./in. Rate, 1.090 in. Coil Bind Height, Each

$76.57

COMP Cams Titanium Retainer, 10 Degree, 1.500 in.-1.550 in. OD Double Springs, Each

COMP Cams Titanium Retainer, 10 Degree, 1.500 in.-1.550 in. OD Double Springs, Each

$58.91

MANLEY Valve Spring, 1.126 in. OD, 330 lbs./in. Rate, 0.880 in. Coil Bind Height, For Subaru EJ20/STiEJ25, Set of 16

MANLEY Valve Spring, 1.126 in. OD, 330 lbs./in. Rate, 0.880 in. Coil Bind Height, For Subaru EJ20/STiEJ25, Set of 16

$711.04