Redcat Racing Part RER13678 Machined Metal Diff. Gears+Diff. Pinions+Drive Gear. Compatible with the following Redcat Racing vehicles: VOLCANO-16. Redcat Racing is located in the United States and has a full staff of support personnel to help you with your Redcat Racing product. Consult your vehicle manual for correct fitment and assembly. Since 2005 Redcat has been your source for Fast - Affordable - Fun!