RC Transmission Module Set 37T Front and Rear Differential & 13T Main Gear for ARRMA 1/10 Big Rock Granite Kraton Outcast Sento 1/8 Typhon Infraction Mojave Upgrade Parts Replace ARRMA ARA311156.

I got one of the metal ones from Amazon for $40 overnight. Only complaint is the limited slip is a little loose. But you can always change the fluid. I do a TON of landing under full throtte, and this one is holding up just fine. When my front ones fails I'll get another. https://a.co/d/0594qYvO