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 experience one of more of the following conditions.
? Bump sensation during low speed tip-in acceleration.
? Downshift engine flare during coast down deceleration at higher altitudes.
? Bump sensation during 6-5 downshift.
? Bump sensation during 1-2 upshift.
? Intermittent delayed upshifts in 1st or 2nd gear.
? Less than desired shift quality when operating the vehicle in Four Wheel Drive
(4WD) Low mode.
? With the vehicle stationary and the Selec-Terrain system set to Snow Mode, the
transmission will perform a 2-1 downshift when pressing the (+) steering wheel
mounted shift paddle instead of remaining in 2nd gear.
