If you're going to race it, I'd also aim convert the LRM gear box to run a dual disk slipper in order to protect/ save the diff from melting. You'll need these parts:
A-3120 Hydra-Drive/ Friction Slipper Shaft
A-3121 Hydra-Drive/ Friction Slipper Backing Plate
And if it's got an early type pinion shaft (part # 46 in the JRX-2 manual) - one that has a press fit brass pinion gear, then you'll also need this part:
A-3022 22T Transmission Pinion Gear
With these three parts fitted, you'll be able to run Losi or AE
![Embarassed :oops:](./images/smilies/icon_redface.gif)
spur gears.
![Losi Jr.2 Update 018.JPG](./download/file.php?id=81160&sid=9d67fa2ffd5a6e503ef0842ad6f89371)
- LRM gear box with A-3120 slipper shaft and A-3121 slipper backing plate.
- Losi Jr.2 Update 018.JPG (100.81 KiB) Viewed 1355 times
![LRM gear box with A-3120 slipper shaft and A-3121 slipper backing plate.](./download/file.php?id=81160&sid=9d67fa2ffd5a6e503ef0842ad6f89371)
- LRM gear box with A-3120 slipper shaft and A-3121 slipper backing plate.
- Losi Jr.2 Update 018.JPG (100.81 KiB) Viewed 1355 times
Be sure to use the correct slipper plate with the long boss (that you can see in the photo above) or the slipper shaft will bind up.
Looking forward to your build
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)