Yes we are able to put the spec-r gear diff on the TCX if you would like to.
These are what you will need,
1. Spec-R gear diff for Tamiya 416x
2. Tamiya 416x front drive pulley
3. HB Cyclone TC front and rear drive belts
4. Tamiya 416x rear drive shafts
*For the rear drive shafts, you can also use our HB universal drive shaft (44mm) with plastic blades w/some dremel work on the drive cups on the gear diff.
I would suggest to start with #1000 diff lube.
Please let me know if you have any questions.
Thank you.