Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
10R80 (RWD) Transmission: Notes
Starting in 2017 MY, 10R80 replaces 6R80 on some truck applications. 10R80 is a 10-speed, step ratio rear wheel drive transmission that is controlled by an external Control Module.
- 2017 MY 10R80 will be controlled by a Transmission Control Module (TCM).
- Starting in 2018 MY, a Powertrain Control Module (PCM) that controls both engine and transmission function will be introduced on gas engine applications
- For Diesel engine applications 10R80 will continue be controlled by a TCM.
10R80 Stick Diagram:
- A Torque Converter with a Torque Converter bypass Clutch (TCC)
- 4 planetary gear sets - each with a Ring gear (R), Carrier (C) and Sun gear (S)
- 7 clutches (Clutches A-F plus a One Way Clutch)
- 4 speed sensors
- Turbine Speed Sensor (TSS) - senses transmission input speed, Carrier 2 (C2)
- Intermediate Speed Sensor A (ISSA) - senses Ring gear 1 speed (R1)
- Intermediate Speed Sensor B (ISSB) - senses Carrier 1 / Ring 4 speed (C1 and R4 are connected, always rotate at the same speed)
- Output Speed Sensor (OSS) - senses Carrier 4 speed (C4)
10R80 has:
10R80 Element apply chart:
| Gear | Ratio | A | B | C | D | E | F | OWC- prevents S1 from rotating backwards | |||||||||
| Park | n/a | X | X | X | B is on S1 will not rotate | ||||||||||||
| Reverse | -4.866 | X | X | X | X | Holds power off, B holds power on | |||||||||||
| Neutral | n/a | X | X | ||||||||||||||
| 1st without parking brake | <=4.696 | X | X | X | Holds power on, overruns power off | ||||||||||||
| 1st with engine braking | 4.696 | X | X | X | X | Holds power on, B holds power off | |||||||||||
| 2nd without engine braking | <=2.985 | X | X | X | Holds power on, overruns power off | ||||||||||||
| 2nd with engine braking | 2.985 | X | X | X | X | Holds power on, B holds power off | |||||||||||
| 3rd | 2.146 | X | X | X | X | Overruns (S1 rotates forward) | |||||||||||
| 4th | 1.769 | X | X | X | X | Overruns (S1 rotates forward) | |||||||||||
| 5th | 1.520 | X | X | X | X | Overruns (S1 rotates forward) | |||||||||||
| 6th | 1.275 | X | X | X | X | Overruns (S1 rotates forward) | |||||||||||
| 7th | 1.000 | X | X | X | X | Overruns (S1 rotates forward) | |||||||||||
| 8th | 0.854 | X | X | X | X | Holds Power off, B holds power on | |||||||||||
| 9th | 0.689 | X | X | X | X | Holds Power off, B holds power on | |||||||||||
| 10th | 0.636 | X | X | X | X | Holds Power off, B holds power on | |||||||||||
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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