Gear differential assembly, the gear differential in box of R2 is the option part for R1, the HD gear differential.
Prevent the silicone leaking, I'll use Team Associate Green Slime on the o-ring and joint shaft.
Before fill in the silicone, I'll do a pre-assembly, let see any problem and solve it out.
And I'll fill the silicone just cover the cross shaft is fine.
