Tips
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Aluminum Rear Hub Link Inserts
Replace your stock rear hub inserts for the new #91699 Factory Team inserts for stronger rear hubs. These anodized 7075 aluminum parts will keep the ball studs in place more securely.
#91699 FT Aluminum Rear Hub Link Inserts -
Graphite Adjustable Bellcrank Input Arm
Use this Adjustable Bellcrank Input Arm to add more steering options to your RC10B64 and B64D. Moving the ball stud into different hole locations allows the driver to adjust the rate of the steering rack: Forward hole has the quickest, most responsive steering feel. Middle hole is stock ball stud location. Rear hole will be less responsive, giving the numbest feel, by slowing down the steering rack rate.
Direct replacement for the #92005 Bellcrank Input Arm. Made of high quality graphite laminate.
#92006 Graphite Adjustable Bellcrank Input Arm -
Spec Racing Options
1. The plastic diff gears are more suitable for Spec racing. Because they are lighter, they remove rotating mass. These were released for the RC10B64 Club Racer.
2. The B64 Slipper Kit is another good option for use in Spec class racing. It is lighter, and more direct power is beneficial in Spec racing when the power is limited. This part requires part #92067 when converting from a gear diff to a slipper.
#92076 Gear Diff Plastic Gears 
#92067 B64 Center Dogbones, slipper 
#92089 B64 Slipper Kit -
Rear Shock Tower, long
Photo shows comparison between short and longer towers.
Left: optional #92013 shock tower accommodates 31mm shock.
Right: standard #92012 shock tower accommodates 27.5mm shock.
This optional, tall rear shock tower allows your RC10B64 and RC10B64D to accommodate longer, higher-capacity 31mm shocks for better compliance on very bumpy or loose tracks. Associated has these optional 31mm shock bodies in two versions:
• #91482 12x31mm V2 Shock Bodies
• #91578 FT 12x31mm FOX® Shock Bodies
#92013 B64 Rear Shock Tower, long 
#91482 12x31 mm V2 Shock Bodies 
#91578 FT 12x31 mm FOX® Shock Bodies with Genuine Kashima Coat, V2, threaded