HRSMMX9390R Steel Helical Differential Ring & Pinion Gear for Traxxas® Mini Maxx® (Rear) (39T/10T)

Steel helical differential ring and pinion gear set sized 39T/10T engineered for the rear differential of Traxxas® Mini Maxx® vehicles. Precision machined helical gears provide smoother and quieter engagement with increased tooth contact area compared with straight-cut designs. Hardened steel construction resists wear and deformation under high torque loads, improving drivetrain durability during aggressive driving and technical terrain. Designed to install directly into the Mini Maxx rear differential housing without modification using stock bearings and hardware. Improves traction consistency and differential action for better acceleration and cornering control.

• Hardened steel helical ring and pinion gear set for strength and long wear.
• 39T ring gear paired with 10T pinion gear sized for rear Mini Maxx diff.
• Helical tooth profile for smoother, quieter gear engagement.
• Direct replacement using stock differential case, bearings, and hardware.
• Improves drivetrain durability under high torque and brushless power.
• Enhances traction distribution for better handling performance.
• Precision machining maintains accurate mesh and reduced backlash.