Exotek Racing - 22X-4 Heavy Duty Gear Diff Case, 7075 Hard Anodized RC Cars & Trucks RTR with Battery Rear arms have a 3mm

Rear arms have a 3mm offset and so will require spacers for adjustment to your chassis wheelbase

With the ability to handle twin 3S LiPo batteries (that's more than 22 volts of LiPo power

Includes a transponder stay component

5mm and 6mm widths to give you different offset wheel options and tuning possibilities

etc then the HB-2 Controller is the answer

Exotek Racing - 22X-4 Heavy Duty Gear Diff Case, 7075 Hard Anodized RC Cars & Trucks RTR with Battery Rear arms have a 3mmHeavy duty machined 7075 alloy differential case for the TLR 22X 4. For the rear, center or front diff. Machined pockets allows for extra fluid to be added for increased fluid capacity and life and the metal construction aids in oil cooling for more consistency. Case weight is 8gr.