Features: B6.3 Specific Updates: Wide pivot rear aluminum arm mounts for use with 73mm arms and 69mm CVA bones to give more predictable rear traction and an easy-to-drive rear-end feel Servo mounting system with aluminum chassis mounts and molded brace is much easier to assemble and has an integrated transponder mount Molded front and rear tower covers protect the edges of the carbon fiber from damage, and keeps from damaging the track surface Octalock spur gear and 11mm Octalock LCF pads using the heavier RC10B74.1 slipper spring for maximum consistency and higher torque capacity Tie-rod battery brace parts and hardware included in kit for tuning additional chassis flex Molded wire clips included for motor and ESC wires to keep your wiring organized Updated Features: Updated carbon fiber front and rear shock towers with fine hole spacing adjustment +3mm extended chassis length for additional stability and reduced weight transfer in high-traction conditions Updated chassis and side rails for use with new direct-to-chassis servo mount giving a more direct steering feel and predictable chassis flex going into and out of corners Updated top plate that keys to a new steering bellcrank brace for increased durability Updated rear wing mounts for more durability and less bending Set screw and flanged nut rear bottom shock mounting hardware for quick and easy shock removal +1 carbon fiber steering arms Black steel M4 low profile (LP) serrated wheel nuts Legacy Features: 3-gear Laydown Stealth® transmission assembly for optimal mass balance on high- grip clay track surfaces Fluid-filled gear differential included to withstand high load cornering Front and rear anti-roll bars included to provide less chassis roll on high-grip surfaces V2 12mm Big Bore threaded aluminum shocks with X-rings for low friction assembly Machined shock pistons for more precise fit and smoother operation V2 12mm shock springs for lower achievable ride height and nimbler feel Aluminum rear ballstud mount with three link positions for maximum adjustability and added strength Factory Team ball bearing set with 24 precision ball bearings, now oiled instead of greased for more efficient drivetrain Easy-access differential with 0, 1, 2, and 3mm height adjustment inserts included. (RC10B6.3 comes with a gear differential). Height adjustment inserts allow driveshaft alignment through all ride height and axle height configurations Rear hub assembly with aluminum vertical ball stud camber link mount and axle height inserts for precise roll center adjustment Front wing mount and front wing included to increased downforce and front grip Integrated 30mm fan mount (fan not included) to prevent motor fade due to overheating 69mm CVA bones for reduced bone plunge and minimized friction at drive pin The symmetric rear arms with improved geometry and stiffness can be flipped to allow a “split” for rear shock mounting position. Arms are available in 73mm and 75mm lengths (73mm included) Outer rear hinge pin is captured with bolt head and lock nut for increased durability Steel electronics and steel under-servo plates included for improved mass balance and lower overall center of mass 5mm aluminum clamping wheel hexes Lightweight aluminum one-piece top shaft and gear Body designed with lower center of mass improves handling on high-grip surfaces (clear body and wing included)