Parts & installation
Manufacturer documented- Vehicle
- Traxxas TRX-4M Defender97054-1
- Position
- center
- Change
- Replace the original single-speed gearbox with the complete 9891 two-speed transmission
Parts needed
Sold packages for one selected configuration| Part | Qty |
|---|---|
| 9891TRX-4M two-speed transmission with Titan 87T motor | 1 |
Traxxas lists this package for the stated vehicle configuration. Check previously fitted upgrades and modifications before ordering.
Installation notes
- One 9891 assembly includes the Titan 87T motor, transmission mount, two additional 2 x 6 mm screws and 22T adapter. Keep the original center driveshafts and the specified transmission/battery-tray screws.
- Select high or low manually. Manual operation does not require 9892, a brushless ECM or a new transmitter; remote shifting is a separate control-system option.
- With 9776 gearing, the gearbox reductions are 32.7:1 low and 9.9:1 high. Optional 9776X speed gearing uses its matching 22T adapter for 19.1:1 and 5.8:1. These are gearbox reductions, not final-drive ratios.
- Route the motor wires through the specified clearance. Optional speed gears are an alternative setup, not an additional required purchase.
Sources
Traxxas 9891 installation instructions (Astra copy) (opens in a new tab)
- Traxxas 9891 transmission instructions cover retained hardware, manual selection and alternative gearbox ratios.