Not exact matches
It's also the latest recipient of the 9G - Tronic nine - speed automatic transmission,
which uses four planetary
gearsets to create its nine ratios from a more compact form than the old 7 - speed unit.
The CVT is stepped in three stages, the ratios of
which are then multiplied by the first three
gearsets, for nine gears.
There are three separate shift fork shafts,
which hold three shift forks to activate the synchronizer rings for the two
gearsets on each of the three gear shafts.
It's backed by the 4L70 - E four - speed overdrive automatic,
which enables great highway cruising performance and fuel economy with the durability of hardened internal parts and five - pinion
gearsets.
After an intensive search and trade - off study, GM engineers selected a powerflow lever
which has four
gearsets, three rotating clutches, and two grounding clutches.
The three rotating clutches have been located forward of the
gearsets to minimize the length of oil feeds
which provides for enhanced shift response and simplicity of turbine shaft manufacturing.
Key for the stellar handling is the active rear differential,
which in fact isn't a differential at all but a
gearset with a pair of independently controlled clutches deployed when needed.