When the GM 4L60-E family of transmissions evolved from the 700-R4, the overrun clutch is no longer applied in 1st and 2nd when accelerating from a stop in D3 shifter position. This change was made to improve coastdown drivability in D3 but had the side effect of reducing the torque capacity of the input section.
For greatly improved input sprag and Forward clutch durability, Sonnax heavy duty 2-3 shift valve 77754-41 for 4L60-E, 4L65-E and 4L70-E units will apply the overrun clutch in D3 1st, 2nd and 3rd Gears.
Hummer(H2),(H2 SUT) 2004-07 V8 6.0L
Hummer(H3),(H3T) 2006-10 L5 3.7L
Hummer(H3),(H3T) 2008-10 V8 5.3L
Rainier 2004-07 L6 4.2L; V8 5.3L
Rainier 2006-07 V8 6.0L
Roadmaster, Wagon 1994-96 V8 5.7L
Escalade, ESV, EXT 1999-07 V8 5.3L 5.7L 6.0L
Fleetwood, Brougham 1991-96 V8 4.9L 5.7L
Limo 1991-96 V8 4.9L 5.7L
Astro Van, Safari 1995-07 V6 4.3L
Avalanche 2001-09 V8 5.3L
Avalanche 2008-09 V8 6.0L
Blazer, Jimmy 1992-07 L4 2.2L; L6 4.2L
Blazer, Jimmy 1992-07 V6 4.3L; V8 5.3L
Envoy, TrailBlazer 1992-09 L4 2.2L; L6 4.2L
Envoy, TrailBlazer 1992-09 V6 4.3L; V8 5.3L
TrailBlazer 2006-09 V8 6.0L
Camaro 1994-02 V6 3.4L 3.8L
Camaro 1994-02 V8 5.7L
Caprice, Wagon 1992-96 V6 4.3L; V8 5.0L 5.7L
Colorado, Canyon 2004-06 L4 2.8L; L5 3.5L
Colorado, Canyon 2007-11 L4 2.9L; L5 3.7L
Colorado, Canyon 2008-11 V8 5.3L
Corvette 1992-05 V8 5.7L 6.0L
Express, Savana, 1500-2500 1996-11 V6 4.3L
Express, Savana, 1500-2500 1996-11 V8 4.8L 5.3L 5.7L
Impala 1994-99 V8 5.7L
S10,S15,Jimmy,Sonoma 1991-04 L4 2.2L 2.5L; V6 4.3L
Silverado,Sierra,1500-3500 1995-10 V6 4.2L; V6 4.3L
Silverado,Sierra,1500-3500 1995-10 V8 4.8L 5.0L 5.3L
Silverado,Sierra,1500-3500 1995-07 V6 5.4L 5.7L 6.0L
Silverado 1500SS 2004-06 V8 6.0L
Sierra Denali 2004-06 V8 6.0L
Suburban 1500-2500 1992-08 V8 4.8L 5.0L 5.3L 5.7L
Suburban 1500-2500 2008-09 V8 6.0L
SSR 2003-07 L6 4.2L; V8 5.3L 6.0L
Tahoe, Yukon 1992-09 V8 4.8L 5.0L 5.3L 5.7L
Ascender 2003-09 L6 4.2L; V8 5.3L 5.4L
Hombre 1997-00 L4 2.2L; V6 4.3L
I280 2006 L4 2.8L
I290 2007-09 L4 2.9L
I350 2006 L5 3.5L
I370 2007-09 L5 3.5L
Bravada 1993-04 L6 4.2L; V6 4.3L
Firebird 1994-02 V6 3.4L 3 8L; V8 5.7L
GTO 2004 V8 5.7L
GTO 2005-07 V8 6.0L
9-7, 9-7X 2005-09 L6 4.2L; V8 5.3L
9-7X 2009 V8 6.0L
1Pcs 2-3 Shift Valve
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On Apr 14, 2023 at 06:06:20 PDT, seller added the following information: