4L60, 4L60-E, 4L65-E, 4L70-E, Sonnax Servo Release Check Valve Kit
DESCRIPTION & SPECSTechnicians would like to find a way to successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. They have been trying, with limited success, since the GM 4L60 (TH700-R4) and 4L60-E series transmissions were introduced. Inadequate metering of 2nd gear band servo release oil causes 3-4 clutch failure. The 3-4 clutch and 2nd Gear band are not properly synchronized. Sonnax servo release check valve kit 77701-076 is a unique solution that combines an orifice with a ball check valve to resolve these problems. Improved design meters servo release oil, reducing 3-4 clutch failure Provides sufficient exhaust so that 3-2 downshifts are smooth Calibrates 3-4 clutch feed orifice without creating shift concerns Drop-in Zip Valve™ parts install quickly and easily NOTE: Servo Release Check Valve; Must Use With D74480D or Original OE Capsule, Extends 3-4 Clutch Life and Improves 2-3 Shift Feel TRANSMISSIONSNAMEYEARS4L60-E1993 – 2014THM700-R41981 – 1992THM700-R4/4L60/MD81980 – 19944L65-E2001 – 20074L70-E2006 – 20094L60-E-HD2002 – 2006 VEHICLE FITMENT YEARSVEHICLEDRIVE TYPES1987 – 2004Avanti IIFWD, RWD1991 – 1992Bentley Turbo RRWD1992 – 1992Bentley MulsanneRWD1991 – 1992Bentley ContinentalRWD1991 – 1996Buick RoadmasterRWD1984 – 1984Buick RegalRWD2004 – 2007Buick RainierAWD, RWD1988 – 1988Buick LeSabreRWD1988 – 1989Buick ElectraRWD1991 – 1996Buick Commercial ChassisRWD1993 – 1996Cadillac FleetwoodRWD2002 – 2006Cadillac Escalade EXTAWD2003 – 2006Cadillac Escalade ESVAWD1999 – 2006Cadillac EscaladeAWD, RWD, 4WD1992 – 1996Cadillac Commercial ChassisRWD1990 – 1992Cadillac BroughamRWD1989 – 1991Chevrolet V35004WD1987 – 1988Chevrolet V304WD1989 – 1991Chevrolet V2500 Suburban4WD1987 – 1988Chevrolet V20 Suburban4WD1987 – 1987Chevrolet V204WD1989 – 1991Chevrolet V1500 Suburban4WD1987 – 1988Chevrolet V10 Suburban4WD1987 – 1987Chevrolet V104WD2002 – 2006Chevrolet Trailblazer EXTRWD, 4WD2002 – 2009Chevrolet TrailblazerAWD, RWD, 4WD1995 – 2009Chevrolet TahoeRWD, 4WD2000 – 2000Chevrolet Suburban 2500RWD, 4WD2000 – 2008Chevrolet Suburban 1500AWD, RWD, 4WD2003 – 2006Chevrolet SSRRWD1999 – 2001Chevrolet Silverado 2500RWD, 4WD2007 – 2007Chevrolet Silverado 1500 ClassicRWD, 4WD1999 – 2013Chevrolet Silverado 1500AWD, RWD, 4WD1983 – 1994Chevrolet S10 BlazerRWD, 4WD1983 – 2004Chevrolet S10FWD, RWD, 4WD1989 – 1991Chevrolet R3500RWD1987 – 1988Chevrolet R30RWD1989 – 1991Chevrolet R2500 SuburbanRWD1989 – 1989Chevrolet R2500RWD1987 – 1988Chevrolet R20 SuburbanRWD1987 – 1988Chevrolet R20RWD1989 – 1991Chevrolet R1500 SuburbanRWD1987 – 1988Chevrolet R10 SuburbanRWD1987 – 1987Chevrolet R10RWD1980 – 1981Chevrolet P30RWD1980 – 1981Chevrolet P20RWD1982 – 1988Chevrolet Monte CarloRWD1982 – 1983Chevrolet MalibuRWD1982 – 1986Chevrolet K5 BlazerRWD, 4WD1988 – 1989Chevrolet K35004WD1982 – 1986Chevrolet K304WD1992 – 1996Chevrolet K2500 Suburban4WD1988 – 1998Chevrolet K25004WD1982 – 1986Chevrolet K20 Suburban4WD1982 – 1986Chevrolet K204WD1992 – 1999Chevrolet K1500 Suburban4WD1988 – 1999Chevrolet K15004WD1982 – 1986Chevrolet K10 Suburban4WD1982 – 1986Chevrolet K104WD1982 – 1996Chevrolet ImpalaRWD1983 – 1995Chevrolet G30RWD1983 – 1995Chevrolet G20RWD1983 – 1995Chevrolet G10RWD2009 – 2009Chevrolet Express 45004 X 22006 – 2009Chevrolet Express 3500RWD1996 – 2009Chevrolet Express 2500AWD, RWD1996 – 2014Chevrolet Express 1500AWD, RWD1982 – 1987Chevrolet El CaminoRWD1982 – 2005Chevrolet CorvetteRWD1991 – 1994Chevrolet Commercial ChassisRWD2004 – 2012Chevrolet ColoradoRWD, 4WD1982 – 1996Chevrolet CapriceRWD1983 – 2002Chevrolet CamaroRWD1988 – 1990Chevrolet C3500RWD1982 – 1986Chevrolet C30RWD1992 – 1996Chevrolet C2500 SuburbanRWD1988 – 1999Chevrolet C2500RWD1982 – 1986Chevrolet C20 SuburbanRWD1982 – 1986Chevrolet C20RWD1992 – 1999Chevrolet C1500 SuburbanRWD1988 – 1999Chevrolet C1500RWD1982 – 1986Chevrolet C10 SuburbanRWD1982 – 1986Chevrolet C10RWD1987 – 2005Chevrolet BlazerAWD, RWD, 4WD2002 – 2006Chevrolet Avalanche 1500RWD, 4WD2007 – 2008Chevrolet AvalancheRWD, 4WD1985 – 2005Chevrolet AstroAWD, RWD2000 – 2000GMC Yukon XL 2500RWD, 4WD2000 – 2008GMC Yukon XL 1500AWD, RWD, 4WD1992 – 2010GMC YukonAWD, RWD, 4WD1987 – 1991GMC V35004WD1987 – 1991GMC V2500 Suburban4WD1987 – 1987GMC V25004WD1987 – 1991GMC V1500 Suburban4WD1987 – 1987GMC V15004WD1992 – 1993GMC TyphoonAWD1991 – 1991GMC SycloneAWD1991 – 2004GMC SonomaRWD, 4WD1999 – 2001GMC Sierra 2500RWD, 4WD2001 – 2003GMC Sierra 1500 HDRWD, 4WD2007 – 2007GMC Sierra 1500 ClassicAWD, RWD, 4WD1999 – 2013GMC Sierra 1500AWD, RWD, 4WD2009 – 2009GMC Savana 45004 X 22006 – 2009GMC Savana 3500RWD1996 – 2009GMC Savana 2500AWD, RWD1996 – 2014GMC Savana 1500AWD, RWD1985 – 2005GMC SafariAWD, RWD1983 – 1991GMC S15 JimmyRWD, 4WD1983 – 1990GMC S15RWD, 4WD1987 – 1991GMC R3500RWD1987 – 1991GMC R2500 SuburbanRWD1987 – 1989GMC R2500RWD1987 – 1991GMC R1500 SuburbanRWD1987 – 1987GMC R1500RWD1980 – 1981GMC P3500RWD1980 – 1981GMC P2500RWD1982 – 1991GMC K35004WD1982 – 1996GMC K2500 Suburban4WD1982 – 1998GMC K25004WD1982 – 1999GMC K1500 Suburban4WD1982 – 1999GMC K15004WD1982 – 2001GMC JimmyAWD, RWD, 4WD1983 – 1995GMC G3500RWD1983 – 1995GMC G2500RWD1983 – 1995GMC G1500RWD2004 – 2005GMC Envoy XUVRWD, 4WD2002 – 2006GMC Envoy XLRWD, 4WD2002 – 2009GMC EnvoyRWD, 4WD2004 – 2012GMC CanyonRWD, 4WD1984 – 1987GMC CaballeroRWD1982 – 1991GMC C3500RWD1982 – 1996GMC C2500 SuburbanRWD1982 – 1999GMC C2500RWD1982 – 1999GMC C1500 SuburbanRWD1982 – 1999GMC C1500RWD2009 – 2010Hummer H3T4WD2006 – 2010Hummer H34WD2003 – 2007Hummer H24WD1991 – 1991Isuzu PickupRWD, 4WD2007 – 2008Isuzu i-370RWD, 4WD2006 – 2006Isuzu i-3504WD2007 – 2008Isuzu i-290RWD2006 – 2006Isuzu i-280RWD1996 – 2000Isuzu HombreRWD, 4WD2003 – 2008Isuzu AscenderRWD, 4WD1984 – 1988Oldsmobile Cutlass SupremeRWD1984 – 1984Oldsmobile Cutlass CalaisRWD1988 – 1992Oldsmobile Custom CruiserRWD1991 – 2004Oldsmobile BravadaAWD, RWD1988 – 1988Pontiac SafariRWD1983 – 1986Pontiac ParisienneRWD2004 – 2006Pontiac GTORWD1983 – 1986Pontiac Grand PrixRWD1983 – 2002Pontiac FirebirdRWD1983 – 1986Pontiac BonnevilleRWD2005 – 2009Saab 9-7xAWD
4L60, 4L60-E, 4L65-E, 4L70-E Sonnax Servo Release Check Valve Kit
Technicians would like to find a way to successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. They have been trying, with limited success, since the GM 4L60 (700-R4) and 4L60-E series transmissions were introduced.