Vehicles equipped with Chrysler 45RFE, 545RFE, 65RFE, 66RFE and 68RFE transmissions can develop erratic or high line pressure due to excessive wear in the OE pressure regulator valve bore. This wear allows critical oil loss, preventing correct line pressure regulation. Without adequate balance oil pressure, the PR valve will be out of its desired position, resulting in line pressure instability and possibly restricting cooler and lube flow. A deteriorated bore can cause lowered line pressure, resulting in soft shifting and burnt clutches. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 44912-10K restores pressure regulator action for line pressure control in all ranges.

Hardcoat anodized aluminum valve combats premature wear
Annular grooves help center valve in bore to reduce side-load wear

Spring Selection Chart


Spring
Usage Function


Green Spring
OE Pressures

Yellow Spring
Sonnax RFE-LB1

More From This Category

MANLEY Valve, Race Master, Intake, Bead Loc, 44.5mm Head Dia, 0.275 in. Stem Dia, 4.705 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, Bead Loc, 44.5mm Head Dia, 0.275 in. Stem Dia, 4.705 Length, For Ford, Each

$51.07

MANLEY Valve, Titanium, Intake, Bead Loc, 2.25 in. Head Dia, 0.3415 in. Stem Dia, 5.35 in. Length, Each

MANLEY Valve, Titanium, Intake, Bead Loc, 2.25 in. Head Dia, 0.3415 in. Stem Dia, 5.35 in. Length, Each

$325.41

MILODON Valves, Exhaust, Race, Stainless Steel, 1.77 in. Dia, For Pontiac, 1968-70, 326, 350, 389, 400, 421, 455, Set of 8

MILODON Valves, Exhaust, Race, Stainless Steel, 1.77 in. Dia, For Pontiac, 1968-70, 326, 350, 389, 400, 421, 455, Set of 8

$475.89

AFR Exhaust Valve, Ferrea Titanium Valve, 1.880 + .100 w/Tip Race Exhaust, Set

AFR Exhaust Valve, Ferrea Titanium Valve, 1.880 + .100 w/Tip Race Exhaust, Set

$3,942.80

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

$2,804.20

MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia, 0.3125 in. Stem Dia, 5.176 in. Length, For Chrysler HEMI, Set of 8

MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia, 0.3125 in. Stem Dia, 5.176 in. Length, For Chrysler HEMI, Set of 8

$1,138.39