Flash: 8HP70 Transmission Shift Enhancements
This bulletin involves reprogramming the Transmission Control Module (TCM) with the
latest available software.
A small number of customers may indicate that the transmission shift quality may not meet
their expectations under the following conditions. These concerns are separated by
vehicle.
WK Vehicles
? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on
after the ignition is cycled.
? Less than desired upshift quality in normal drive mode under light/medium
acceleration.
? Less than desired Power-on downshift quality (i.e. passing).
? Less than desired powertrain performance while driving at higher altitudes, on steep
grades, or during high speed driving.
? Less than desired tip in/out acceleration during torque converter clutch operation.
? Less than desired engagement quality in 4x4 high or 4x4 low range.
WD Vehicles
? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on
after the ignition is cycled.
? Less than desired engagement quality in 4x4 high or 4x4 low range.
