Dodge RAM TRX 6.2 Gear Transmission 2023
2023 Dodge RAM TRX (702 hp / 711 PS) utilizes the heavy-duty TorqueFlite 8HP95 8-speed automatic transmission. While it belongs to the world-renowned ZF 8HP family, the 95 designation indicates it is the highest torque-capacity variant, shared with the Jeep Trackhawk and Dodge Demon.
For the 2023 model year, this transmission is specifically calibrated to handle the $881\text{ Nm}$ ($650\text{ lb-ft}$) of torque from the Supercharged 6.2L HEMI® V8 while managing the TRX’s massive curb weight and 35-inch tires.
1. Gear Ratios (ZF 8HP95)
The TRX utilizes aggressive low gearing for off-the-line acceleration, with two overdrive gears for highway cruising.
| Gear | Ratio | Purpose |
| 1st | 4.71 | Maximum launch torque |
| 2nd | 3.14 | Rapid acceleration |
| 3rd | 2.11 | Mid-range pull |
| 4th | 1.67 | Performance “Power” gear |
| 5th | 1.29 | High-speed transition |
| 6th | 1.00 | Direct Drive (1:1) |
| 7th | 0.84 | Overdrive (Fuel Economy) |
| 8th | 0.67 | Deep Overdrive (Cruising) |
| Reverse | 3.30 | High-torque reverse |
2. Performance Features
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Baja Mode Calibration: In 2023, the TRX transmission software features a specialized “Baja” mode that reduces shift times to $approx$ $160\text{ milliseconds}$ and holds gears longer to stay in the supercharger’s peak boost range.
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Launch Control: The transmission works in sync with the engine’s torque reserve system, allowing the torque converter to “stall” at a specific RPM for maximum 0–60 mph launches.
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Torque Converter: Uses a high-capacity, heavy-duty damper specifically tuned for the 6.2L Supercharged vibration profile.
3. Maintenance & Fluids (2023 Specs)
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Fluid Type: Mopar 8 & 9 Speed ATF (or ZF Lifeguard 8).
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Service Interval: RAM technically lists this as “Filled for Life” under normal conditions, but for TRX models used off-road or for towing, a fluid and filter change at 100,000 km ($60,000\text{ miles}$) is highly recommended by enthusiasts and mechanics.
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Filter Design: The transmission filter is built into the plastic oil pan. To replace the filter, the entire pan assembly must be replaced.
4. Technical Inspection for Resale/Inventory
If you are sourcing a 2023 TRX transmission, verify these specific identifiers:
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Case Marking: Look for the “8HP95” stamping on the side of the main housing.
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Output Shaft: Ensure the output shaft splines are not twisted. The 702 hp launch can put immense stress on the connection to the BorgWarner 44-40 transfer case.
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Oil Pan Integrity: Check the composite plastic pan for impacts. Because the TRX sits high, it is prone to “high-centering” on rocks, which can crack the transmission pan.
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Wiring Harness: The 2023 models use a high-speed CAN-bus connector. Ensure the pins are straight and there is no evidence of heat-soak near the exhaust manifold.
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