GM 8L transmission
The 8L 45 is an eight-speed automatic transmission built by General Motors debuting in the 2016 Cadillac CT6. It is designed for use in longitudinal engine applications attached to the front-located engine with a standard bell housing. It is a hydraulic (hydramatic) design sharing much with the 8L 90 transmission. Estimated weight savings over the heavier duty 8L 90 is 33 lb (15 kg). Gear ratios used enable a wide 7.0 ratio spread.
| 8L 45 · 8L 90 | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Production | 2014– |
| Body and chassis | |
| Class | 8-speed longitudinal automatic transmission |
| Related | ZF 8HP |
| Chronology | |
| Predecessor | 6L 45 · 6L 50 · 6L 80 · 6L 90 |
| Successor | 10L 80 · 10L 90 · 10L 1000 |
The 8L 90 is an eight-speed automatic transmission built by General Motors. It is designed for use in longitudinal engine applications either attached to the front-located engine with a standard bell housing or in the rear of the car adjacent to the differential (as in the Corvette). It is a hydraulic (hydramatic) design. GM also produces a similar design with the smaller 8L 45.
Both gearboxes are based on the layout of the ZF 8HP transmission from 2008, with the only difference being that gearsets 1 and 3 are swapped.