Flash: 8HP70 Transmission Shift Quality And Drivability Enhancements
This bulletin involves reprogramming the Transmission Control Module (TCM) with the
latest available software
A small number of customers may experience one or more of the following conditions.
? Bump sensation during tip-in acceleration between 5-10 mph (8-16 kph).
? Less than desired transmission performance during Torque Converter Clutch (TCC)
lockup.
? Less than desired transmission performance in Tow/Haul mode.
? Less than desired transmission performance during coast down deceleration at
higher altitudes.
? Bump sensation during 6-5 downshift.
? Bump sensation during 1-2 upshift.
