Product Details

Sonnax HP-4l60E-01 performance pack shift kit for the GM 4L60E, 4L65E, and 4L70E overdrive automatic transmissions.

• Part brand: Sonnax
• Part number: HP-4l60E-01
• Year range: 1993-Up
• Transmission models: 4L60E, 4L60-E, 4L65E, 4L65-E, 4L70E, 4L70-E, 4L75E, 4L75-E, M30, M32, M70
• Makes: Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, and SAAB

Sonnax Performance Pack HP-4l60E-01 combines innovative heavy duty, performance calibration for firmer shifts under load without sacrificing low-speed drivability. The precision components in this kit upgrade the 4l60e for maximum performance and durability by recalibrating pressures, recalibrating shift accumulation and including improved parts for areas that commonly wear. This kit is suitable for any heavy-duty application and is a critical foundation for other upgrades when modifying the 4l60e for high performance use.

Pump parts include:

• Boost valve with o-ring, .490” – Line pressure booster
• Elevated pressure regulator spring
• High rpm pump slide spring

Servo parts include:

• 4th gear servo return spring
• Servo cushion spring
• Servo piston d-ring kit

Case parts include:

• 3-4 accumulator piston kit
• 3-4 accumulator spring
• Servo release check valve

Valve body parts include:

• Forward accumulator kit
• Accumulator valve shim
• Twist drills

Accumulator parts include:

• 1-2 pinless accumulator piston kit
• 1-2 accumulator inner spring
• 1-2 accumulator outer spring
• 1-2 accumulator waved spring.
• Accumulator housing spacer

Features & benefits:

• Shorter shifts which get progressively firmer with load
• Faster pressure increase and higher overall pressure for greater clutch and band holding power
• Three ultra-reliable, patented, billet pinless accumulator pistons.
• Unique 1-2 accumulator spring combination for “shifts with character”
• Improved high rpm pressure.
• Third accumulator valve gets the 2-3 right the first time, every time.
• Consistent results, no guessing on calibration
• Prevents worn accumulators and separator plate.
• Optional TCC on-off conversion prevents excess TCC pressure.

These transmissions can be found in the following vehicles; however, you should double check your application with the 16 bolt pan count. It is common for similar vehicles to have multiple transmission options available from the factory.

Buick

• Rainier, 2004-2007
• Roadmaster, 1994-1996

Cadillac

• Brougham, 1994-1997
• Escalade, EXT, ESV 1999-2006
• Fleetwood, 1994-1997

Chevrolet

• Astro Van, 1993-2005
• Avalanche, 2002-2008
• Blazer, 1993-2005
• C1500, some C2500, 1993-1999
• Camaro, 1994-2002
• Caprice, 1994-1996
• Corvette, 1994-2005
• Impala SS, 1994-1996
• S10, 1993-2004
• Silverado Truck, 1999-2013
• SSR, 2003-2007
• Suburban, 1993-2013
• Tahoe, 1993-2013
• Trailblazer, 2001-2009
• Van, 1994-2013

GMC

• Canyon, 2004-2012
• Colorado, 1994-2012
• Envoy - XUV – Denali, 2001-2010
• K1500, Some K2500, 1993-1999
• Safari Van, 1993-2005
• Sierra Truck, 1999-2013
• Sonoma, 1993-2004
• Van, 1994-2013
• Yukon, 1993-2013

Hummer

• H2, 2003-2007
• H3, 2006-2011

Isuzu

• Ascender, 2003-2009
• Hombre, 1996-2000
• Pickup, I280, I350, I290, I370 2006-2009

Oldsmobile

• Bravada, 1993-2004

Pontiac

• Firebird & Trans Am, 1993-2002
• GTO, 2004-2006

Saab

• 9-7, 2005-2009

This Sonnax shift kit works in the following years: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, and 2013.

This transmission is part of the Turbo-Hydramatic series and also known by the following codes and model numbers: THM 4L60E, 4L60-E, 4L65E, 4L65-E, 4L70E, 4L70-E, 4L75E, 4L75-E, M30, M32, M70