Currie F9, F10 Portal Axle Overdrive Gear Set - For Vanquish Products SCX10-II Portal, VS4-10 Ultra, and VS4-10 Phoenix F10 Portal Axles.  

• Suggested for use in the front axle only, or front AND rear axle.  
• 1.4:1 gear ratio compared to 1.67:1 gear ratio with gear set included in the portal axles
• Helps with steep climbs and turning radius
• Stock replacement for the VS4-10 Ultra and VS4-10 Phoenix (VPS09007) kits.