Product Details

The Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work or HD and HP sport vehicles. Innovative components work together to precisely recalibrate pressures and shift accumulation, delivering firmer shifts under load without sacrificing low-speed drivability. To target common wear areas in the transmission, the kit includes many improved parts to repair damage, prevent future wear and improve reliability.

• Recalibrated shift accumulation, with tunability for great, heavy-duty shifts
• Improved pump components minimize leaks, plus maintain pressure and lube under demanding use
• The only way to eliminate TCC PWM function without over-pressurizing the converter
• Includes internal parts for setup and to prevent common failures

Shift Kit Contents

• Line Pressure Booster Kit
• Lube Regulated Pressure Regulator Valve
• TCC Pressure Limiter Valve, Spring & Plug
• AFL Filter End Plug & O-Ring Kit
• Direct Clutch Dual Feed Plug
• Direct Clutch Dual Feed Aluminum Plugs, Qty 3, 2 Extra
• 1-2, 2-3 & 3-4 Accumulator Piston Springs, Qty 3
• Checkcballs, Qty 8
• Twist Drill .062"
• Twist Drill .086"
• Heavy Duty Case Bushing & Bearing Kit
• Direct Housing Support Ring & Seal
• Heavy Duty Intermediate Piston Spring Retainer Plate
• Case Saver Retainer
• Heavy Duty Clutch Retaining Ring Intermediate Clutch
• Accumulator Valve Springs & Adjustable End Plug 2 Springs
• Heavy Duty Direct Piston Return Springs, Qty 8
• Forward Clutch Hub Front Washer .078 in.
• Reverse Servo Spacer Kit

The 4L80E and its variants were in production from 1991-2010 and can be identified by the 17-bolt oil pan and 4 forward gears.  Typically, this transmission is found in the heavier duty trucks and vans; mostly the 2500 and 3500 series.  It will also be found in the heavy half-ton, such as the 1500HD, SS, or Denali truck with the 6.0L

The 4L80E and 4L85E transmissions were found in the following GM labels and other brands; Chevrolet, Chevy, GMC, Hummer H1, Isuzu NPR, Jaguar, Aston Martin, Bentley, Rolls-Royce

These transmissions can be found in the following vehicles; however, you should double check your application with the 17-bolt pan count.  It is common for similar vehicles to have multiple transmission options available from the factory.

Chevrolet

• Avalanche 2500, 2002-2006
• Base Cab & Chassis, 2500, 3500, K2500, K3500, 1991-2009
• Express Van, 2500, 3500
• Silverado, Cheyenne, 2500, 3500, 2500 HD, K2500, K3500, 1991-2007
• Suburban, 2500 1996-2007
• Tahoe 6.0L, 8.1L 1995-2003

GMC

• Base Cab & Chassis, 2500, 3500, C2500, C3500, 1991-2009
• Savana Van, 2500, 3500
• Sierra, 2500, 3500, 2500HD, C2500, C3500, 1991-2007
• Yukon XL 6.0L, 8.1L 1995-2003

Hummer

• H1 1991-2005

Other

• Aston Martin DB7 1996-1999
• Bentley 1991-2006 (confirm 4-speed with 17 bolt pan)
• Isuzu NPR gas engine 1990-2007
• Jaguar XJS, XJS-R, XJ12 1993-1998
• Motor Homes 1995-2005
• Rolls-Royce 1992-2003

This transmission is part of the Turbo-Hydramatic series and also known by the following codes and model numbers: 4L80E, 4L80-E, MT1, 4L85E, 4L85-E, MN8

This shift kit fits the following years: 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, and 2013.