This is my personal R31 HOUSE/SHIBATA GRK4 build. Read up on the GRK history here. I bought this chassis second hand and didnt really change much up until now. Here are the parts that have been added from a standard GRK4.
TGames (Permanently Closed) Lightweight Lower Chassis Plate
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This was an "R" conversion before the late December 2024 release of the Shibata GRK5
R conversion
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T Games Lightweight Version
Chassis Parts List w/Part #:
- Standard Motor Mount R31S311BK
- Battery Low Mount Rear Shock Tower R31S073
- Vertical Adjustable Battery Base Plate R31S072
- GRK5 Bevel Gear 14T R31S069
- Reve D RDX Rear Diffuser RV-D1-001RM
- Reve D RDX Full Dampers (N/A)

I will continue to update this build thread as time progresses. It is currently in the process of having the electronics finalized and esc tune dialed in. Thank you for your time.
- ESC - Hobbywing XR14
- MOTOR - KWTRC Endless 10.5T 540 Brushless Sensored
- SERVO - Injora 14kg
- GYRO - Power HD G2
Thats all for now. 21MAR2025
I went to the track and had a blast on Polished Concrete. It drove fine and I didn’t mess with any settings mechanically or electronically. Here is a short clip of it driving. Afterwards, I bought a servo horn to support the local hobby shop and to get rid of steering play from the servo saver it originally had on it. Now the car feels even better. See below for pictures of the old horn and the new horn installed


UPDATE: 24MAR2025
There is now a body in the works. I needed 200mm so this HPI 2015 RTR Spec body was perfect.


UPDATE 27MAR2025