Only some Aisin AW 55-50SN and 55-51SN transmissions ('05-later units installed in Nissan and GM vehicles) were equipped with a control spring in the B5 clutch control valve line-up. Using a valve body without a spring in those vehicles creates a mismatch between the B5 lineup and the TCM calibration, often causing a harsh 2-3 upshift or 3-2 downshift. Sonnax B5 control spring 59947-33 is a direct replacement for the OE spring. This allows rebuilders to rebuild any suitable core for use in vehicles where the spring is required, or correct shift concerns caused by a missing spring.

Restores valve train response, matching the TCM calibration
Allows any AW55-50SN valve body to be converted to a spring type application

More From This Category

COMP Cams Valve Lock, Steel, 10 Degree, 3/8 in, 2 Groove, w/o Lash Cap Recess For Chrysler, Pair

COMP Cams Valve Lock, Steel, 10 Degree, 3/8 in, 2 Groove, w/o Lash Cap Recess For Chrysler, Pair

$6.10

MANLEY Valve Lock, Super 7 Degree Captiv Loc, Bead Loc, Steel, +.050 .3110 in. Stem, Each

MANLEY Valve Lock, Super 7 Degree Captiv Loc, Bead Loc, Steel, +.050 .3110 in. Stem, Each

$20.59

MANLEY Valve Spring Retainer, Titanium, 7 Degree, Std Height, 1.020/1.030 in. OD, Set of 16

MANLEY Valve Spring Retainer, Titanium, 7 Degree, Std Height, 1.020/1.030 in. OD, Set of 16

$560.70

MANLEY Valve Spring Retainer, Titanium, Super 7 Degree, 1.660 in. OD, Lightweight, Triple, Each

MANLEY Valve Spring Retainer, Titanium, Super 7 Degree, 1.660 in. OD, Lightweight, Triple, Each

$58.39

Crow Cams Valve Stem Seals Ford 11/32" Viton Umbrella

Crow Cams Valve Stem Seals Ford 11/32" Viton Umbrella

$60.35

Crow Cams Valve Stem Seal Hemi 6.4 Set

Crow Cams Valve Stem Seal Hemi 6.4 Set

$38.98