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2021Trailblazer RS AWD Scarlet Red Metallic
867 Posts
Discussion Starter · #1 · (Edited)
CVTContinuously Variable Transmission
Application:1.2L Turbo and 1.3L Turbo FWD
Variator ratio spread7.0:1
Overall ratio spread7.0:1
Final Drive Ratio:5.45:1
Available only with FWD drivetrain.

CVTs provide a smooth driving experience because there are no gears for the transmission to shift through as you accelerate. Instead, a CVT is driven by two pulleys connected by a belt. One pulley is connected to your vehicle’s engine, while the other is attached to the driveshaft for your front wheels. These pulleys change in size in proportion to each other to create an infinite number of gears.

9T659-Speed Automatic Transmission
Application:1.3L Turbo AWD
Gear Ratios:
Final Drive Ratio:3.17:1
Available only with the AWD drivetrain and 1.3L engine.

Since General Motors led the design work on this transmission, they got to keep some 60 patents related to the design. It took over 800 prototypes to get the design dialed-in. But clever engineering like the on-axis design, allowed them to fit five planetary gears sets, four stationary clutches and three rotating clutches, into a case that is barely an inch longer than the one used for the GM 6 speed transmission.

Another unique element of the General Motors 9T65 9-speed transmission, is the selectable one-way clutch. This is one of the most unique 9T65 transmission parts, as it essentially combines two clutches into one. The 9T65 selectable one way clutch is responsible for engaging first and reverse gears, and it can freewheel or hold torque, depending on what the 9T65 transmission control module tells it to do. And it’s considerably smaller than the traditional plate clutch pack and sprag clutch that was used in the old GM 6 speed automatic.

The 9T65 Active Oil Management system is another unique element of this transmission. To better control the fluid pressure and volume, the 9T65 valve body has an internal expansion tank built into its side cover, which will hold excess ATF until the 9T65 TCM decides that it’s needed.


2021Trailblazer RS AWD Scarlet Red Metallic
867 Posts
Discussion Starter · #2 ·
If anyone finds more information about either transmission just post it here and I'll add it to the info above.
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