In GM 4T60, 4T60-E and 4T65-E units, the continuous stroking of the 1-2 (Forward) and Reverse servo boost valves wear away at the valve bore, creating excess clearance and reduced apply pressures. This can lead to 1-2 band slippage, delayed engagements, 1-2 shift flares, and decreased Reverse pressure. Sonnax oversized 1-2 and Reverse servo boost valve kit 84754-40K that will restore the hydraulic integrity and more than doubles the valve-to-bore contact area to prevent leakage.

Hardcoat anodized aluminum valve combats premature wear
Valve will fit both the Forward and Reverse applications

More From This Category

Sonnax Oversized Lockup Relay Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

Sonnax Oversized Lockup Relay Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

$106.67

MANLEY Valve, Pro Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 5.111 in. Length, SBC, Set of 8

MANLEY Valve, Pro Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 5.111 in. Length, SBC, Set of 8

$607.34

MANLEY Valve, Titanium, Intake, Bead Loc, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, Each

MANLEY Valve, Titanium, Intake, Bead Loc, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, Each

$302.72

MANLEY Valve, Race Master, Exhaust, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

$380.66

MANLEY Valve, Race Master, Intake, 37mm Head Dia, 0.2355 in. Stem Dia, 4.722 Length, For Ford 5.0L, Set of 8

MANLEY Valve, Race Master, Intake, 37mm Head Dia, 0.2355 in. Stem Dia, 4.722 Length, For Ford 5.0L, Set of 8

$408.60

MANLEY Valve, Budget Replacement, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 4.88 in. Length, SBC, Each

MANLEY Valve, Budget Replacement, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 4.88 in. Length, SBC, Each

$18.76