The B1 band in Aisin AW TF-80SC and TF-81SC transmissions is applied in 2nd and 6th Gears in conjunction with other clutch packs. As the B1 band control valve oscillates and strokes over time, bore deterioration results which prevents proper hydraulic control of the B1 band. This can cause flares, harsh shifts, slipping, erratic clutch apply timing, ratio codes and a burnt B1 band. Reconditioning the bore and installing Sonnax oversized B1 band control valve kit 39741-48K restores normal shift operation and feel by re-establishing the hydraulic integrity of the B1 circuit.

New spring matches OE calibration
Hardcoat anodized aluminum valve combats premature wear
Annular grooves help center valve in bore to reduce future side-load wear

More From This Category

Sonnax Clutch A Control Boost Valve Kit, Ford, ZF6Hp19/26/32, 6R60/75/80/100, Each

Sonnax Clutch A Control Boost Valve Kit, Ford, ZF6Hp19/26/32, 6R60/75/80/100, Each

$118.83

MANLEY Valve, Titanium, Intake, Bead Loc, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.04 in. Height, Each

MANLEY Valve, Titanium, Intake, Bead Loc, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.04 in. Height, Each

$302.72

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

$318.84

Sonnax Boost Valve Kit, GM, 4L30E, Ar25, Ar35, Oe Code 264, Each

Sonnax Boost Valve Kit, GM, 4L30E, Ar25, Ar35, Oe Code 264, Each

$75.20

MANLEY Valve, Severe Duty, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Each

MANLEY Valve, Severe Duty, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Each

$78.54

MANLEY Valve, Pro Flo, Intake, 1.937 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

MANLEY Valve, Pro Flo, Intake, 1.937 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

$75.93