Transgo Reprogramming Kit: GM 4L80E And 4L85E (1991–2013)
Designed for 1991–2013 General Motors vehicles featuring 4L80E and 4L85E automatic transmissions, this Performance Reprogramming Kit addresses frequent issues such as absent upshifts, sluggish 2-3 shifts, damaged direct frictions, and mechanical breakage. It also resolves common solenoid performance and gear ratio codes.
The factory boost valve assembly is prone to wear, often leading to insufficient pressure or dangerous runaway boost pressure. Low pressure typically results in direct clutch failure and shift quality issues, while runaway pressure can cause catastrophic damage to the transmission case, piston, and direct drum.
Features and Benefits
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Enhanced Durability: Calibrated pump, valve body, and internal components work with an increased line pressure curve to boost shift quality and longevity.
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Triple Torque Capacity: A laminated triple separator plate enables dual feeding for the 3rd gear clutch—the transmission's primary weak point—without requiring full disassembly.
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Reliable Pressure Regulation: A hardened, wide-land boost valve and bushing design prevents wear to ensure consistent performance.
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System Protection: The included EPC boost pressure relief valve system guards against runaway pressure to prevent cracked cases and drum failures.
Corrects, Prevents, and Reduces
- Breakage caused by high pressure
- Soft 2-3 shifts and burnt direct clutches
- Slow 3-2 downshifts and absent upshifts
- Harsh 1-2 shifts
- Low pressure resulting from solenoid filter failure
- Error codes: 39, 68, 85, 86, 87, P0731, P0732, P0733, P0734, P0751, P0756, P0894, and P1870
Kit Includes
- Laminated triple separator plate, gaskets, and drill bits
- USA-made hardened boost valve, bushing, and pressure regulator components
- Relief valve system (plate, valve, spring, e-clip, and nuts)
- Heavy-duty intermediate case snap ring and reinforced 4th feed bolt
- 16 direct clutch return springs
- 1-2, 3rd, and accumulator valve springs
- Actuator filter tapered plug, O-rings, and end plugs
Transmissions: 4L85E (MN8) 1991-2013, 4L80E (MT1) 1991-2013
Vehicle
AM GENERAL
H1 HUMMER 1993-2005 4 SP 4WD V8 5.7L 6.5L DIESEL
ASTON MARTIN
DB7 2000 4 SP RWD V6 3.2L
BENTLEY
ARNAGE 2002-2006 4 SP RWD V8 6.8L
CHEVROLET
EXPRESS 2005-2016 4 SP RWD V8 6.6L
SUBURBAN 2500 1996-2007 4 SP R/4WD V8 8.1L
VAN FULL SIZE 2500 1996-2009 4 SP R/4WD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESEL
VAN FULL SIZE 3500 1995-2009 4 SP RWD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESEL
C/K, PICK-UP 1500, C/K, PICK-UP 2500 1995-2000 4 SP R/4WD V8 5.0L 5.3L 5.7L 6.0L 7.4L 6.5L DIESEL
EXPRESS 2002-2016 4 SP RWD V8 4.8L 6.0L
SILVERADO 1500HD, SILVERADO 1500SS 1998-2007 4 SP R/4WD V8 6.0L 6.5L
SILVERADO 2500, SILVERADO 3500 2001-2007 4 SP R/4WD V8 6.0L
SILVERADO 2500HD 2001-2007 4 SP R/4WD V8 6.0L
SUBURBAN 1500 1995-2008 4 SP R/4WD V8 6.0L 6.5L DIESEL 7.4L
TAHOE 1995-2003 4 SP R/4WD V8 6.0L 8.1L 6.5L DIESEL
VAN FULL SIZE 2500 1996-2009 4 SP R/4WD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESEL
VAN FULL SIZE 3500 1995-2009 4 SP RWD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESEL
GMC
SAVANA 2005-2016 4 SP RWD V8 6.6L
YUKON XL 2000-2006 4 SP R/4WD V8 6.0L 8.1L
SAVANA 2002-2016 4 SP RWD V8 4.8L 6.0L
SIERRA DENALI 1998-2007 4 SP R/4WD V8 6.0L 6.5L
SIERRA 2500, SIERRA 3500 2001-2007 4 SP R/4WD V8 6.0L
SIERRA 2500HD 2001-2007 4 SP R/4WD V8 6.0L
YUKON XL 2000-2006 4 SP R/4WD V8 6.0L 8.1L
ISUZU
TRUCK NPR, W4 1987-2008 4 SP RWD V8 5.7L 6.0L
JAGUAR
XJ12/XJR/XJS 1994-1997 4 SP RWD L6 4.0L V12 6.0L
ROLLS-ROYCE
ARNAGE/SILVER SERAPH 2000-2003 4 SP RWD V8 6.8L
Alternate Words: Automatic Transmission, Reprogramming, Improvement , Correction, Shift , Valve Body Rebuild Kit