This 4L80E-HD2 Reprogramming Kit fits 1991 to 2013 General Motors vehicles equipped with the 4L80E and 4L85E automatic transmission. Common complaints on this transmission are, no upshifts, soft 2-3 shift, burnt direct frictions, broken hard parts as well as gear ratio and solenoid performance codes.
The boost valve assembly is notorious for wear causing both low pressure as well as runaway boost pressure. With the low boost pressure problem, the resulting complaints are a soft 2-3 shift, direct clutch failure as well as the gear ratio and solenoid performance codes. On the other hand, the runaway boost pressure problem can result in a costly broken case, direct drum and piston failure.
Features and benefits:
This TransGo Reprogramming Kit includes valve body, pump and internal components that are calibrated to work in concert with an elevated line pressure curve that will greatly improve the overall durability and shift feel of the transmission. Also, the laminated triple separator plate provides dual feed for the 3rd gear clutch without having to dismantle the transmission. Dual feeding the 3rd gear clutch triples the torque capacity of the 3rd gear clutch which is the Achilles heel of this transmission. In addition, the included highly improved wide land design boost valve and bushing resists wear so that pressure regulation functions consistently for the long haul. Lastly, the EPC boost pressure relief valve system provided helps protect against accidental runaway boost pressure to stop the case and direct drum failure.
Corrects/Prevents/Reduces:
- High pressure parts breakage
- Soft 2-3 shift
- Burnt direct clutch
- Slow 3-2 downshift
- No upshifts
- Harsh 1-2 shift
- Low pressure due to solenoid filter breakup
- Codes 39, 68, 85, 86, 87, P0731, P0732, P0733, P0734, P0751, P0756, P0894 and P1870
Includes:
- Heavy duty intermediate case snap ring
- (2) Accumulator valve springs, end plug and O-ring
- Actuator filter tapered plug, O-ring, spring and end plug
- Relief valve system plate, valve, spring, e-clip and nuts
- Laminated triple separator plate
- Valve body and accumulator body gaskets
- (2) Drill bits
- 3rd accumulator spring
- USA-made hardened boost valve and bushing
- Pressure regulator valve spacer, washer, springs and snap ring
- New stronger 4th feed bolt and washer
- 1-2 accumulator spring
- (16) Direct clutch return springs
Hummer H1 1993-2005 V8 Gas 6.5L Diesel 4 Spd RWD 4X4
Escalade, ESV, EXT 2006-2007 V8 4.8L 5.3L 4 Spd RWD AWD
Avalanche 2001-2003 V8 8.1L 4 Spd RWD 4X4
Express, Savana, 2500-3500 1996-2009 V8 4.8L 5.3L 5.7L 4 Spd RWD 4X4
Express, Savana, 2500-3500 1996-2009 V8 6.0L 7.4L 4 Spd RWD 4X4
Express, Savana, 2500-3500 2006-2010 V8 6.6L Diesel 4 Spd RWD 4X4
Express, Savana, 3500 2002 V8 8.1L 4 Spd RWD 4X4
Silverado,Sierra,1500-3500 1995-2007 V8 5.0L 5.7L 6.0L 6.5L 4 Spd RWD 4X4
Silverado,Sierra,1500-3500 1995-2007 V8 6.6L Diesel 4 Spd RWD 4X4
Suburban 1500-2500 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4X4
Suburban 1500-2500 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4
Tahoe, Yukon 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4x4
Tahoe, Yukon 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4
NPR Truck 1991-2004 V8 5.7L 4 Spd RWD
NPR Truck 2005-2010 V8 6.0L Gas 4 Spd RWD
XJS 1993-1996 L6
4.0L; V12 6.0L 4 Spd RWD
Please be sure your Pan has 17 Bolt Holes
for your
Transmission to be a 4L80E
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