In Jatco/Nissan RE5R05A units, the cooler bypass valve is designed to allow excess oil to bypass the cooler circuit when required. However, if there is excessive wear in the bore, it can allow converter and/or lube circuit leakage and prevent the valve from stroking to the bypass position if needed. This can result in increased ATF temperature causing bushing and sealing failure, planetary destruction and converter or part overheating and damage. Severe wear prevents the valve from stroking properly, simulating a cooler restriction and increasing converter charge pressure. Sonnax oversized cooler bypass valve kit 63741-07K allows the bore to be refurbished to restore hydraulic integrity and has multiple design improvements to prevent reoccurrence of the failure.

Hardcoat anodized aluminum valve combats premature wear
Annular grooves added to hydraulically center the valve in the bore to prevent wear
The lengthened valve provides over twice as much sealing contact area as OE
Stability of the valve in the bore is greatly increased due to the critical spool diameter being over twice as long as OE

More From This Category

MANLEY Valve, Race Master, Exhaust, 30mm Head Dia, 0.274 in. Stem Dia, 4.587 Length, For Ford, Set of 8

MANLEY Valve, Race Master, Exhaust, 30mm Head Dia, 0.274 in. Stem Dia, 4.587 Length, For Ford, Set of 8

$408.60

MANLEY Valve, Race Master, Exhaust, 32.0 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Set of 12

MANLEY Valve, Race Master, Exhaust, 32.0 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Set of 12

$849.04

MANLEY Valve, Race Master, Exhaust, 29 mm Head Dia, 6 mm Stem Dia, 101.52 mm Length, For Mazda Miata, Each

MANLEY Valve, Race Master, Exhaust, 29 mm Head Dia, 6 mm Stem Dia, 101.52 mm Length, For Mazda Miata, Each

$49.91

MANLEY Valve, Pro Flo, Intake, 2.205 in. Head Dia, 0.3133 in. Stem Dia, 5.2 in. Length, For Chevrolet LS7, Each

MANLEY Valve, Pro Flo, Intake, 2.205 in. Head Dia, 0.3133 in. Stem Dia, 5.2 in. Length, For Chevrolet LS7, Each

$75.93

MANLEY Valve, Race Master, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, For Chevrolet SB, Each

MANLEY Valve, Race Master, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, For Chevrolet SB, Each

$47.58

MILODON Valves, Exhaust, Race, Stainless Steel, 1.625 in. Dia, +.200 Long, Small For Chevrolet, 350, 383, 400, Set of 8

MILODON Valves, Exhaust, Race, Stainless Steel, 1.625 in. Dia, +.200 Long, Small For Chevrolet, 350, 383, 400, Set of 8

$432.85