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

Sonnax Torque Converter Limit Spring, Chrysler, 45RFE/545RFE/65RFE/66RFE/68RFE

Sonnax Torque Converter Limit Spring, Chrysler, 45RFE/545RFE/65RFE/66RFE/68RFE

$27.91

COMP Cams Valve Spring, Single, 1.406 in. O.D, 251 lbs./in. Rate, 1.203 in. Coil Bind Height, Each

COMP Cams Valve Spring, Single, 1.406 in. O.D, 251 lbs./in. Rate, 1.203 in. Coil Bind Height, Each

$10.25

COMP Cams Valve Spring, Single, 1.354 in. O.D, 380 lbs./in. Rate, 1.280 in. Coil Bind Height, Each

COMP Cams Valve Spring, Single, 1.354 in. O.D, 380 lbs./in. Rate, 1.280 in. Coil Bind Height, Each

$13.55

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

$74.41

Trick Flow Valve Spring Retainers, Steel, .875 in. Outside Diameter, .620 in. Inside Diameter, Set of 8

Trick Flow Valve Spring Retainers, Steel, .875 in. Outside Diameter, .620 in. Inside Diameter, Set of 8

$68.59

COMP Cams Steel Retainer, Tool, 7 Degree, 5.0d Coyote w/ 26125 Springs, Each

COMP Cams Steel Retainer, Tool, 7 Degree, 5.0d Coyote w/ 26125 Springs, Each

$32.62