The Exotek B64 Heavy Duty Spur Gear is machined from heavy duty pom (delrin) material with a thicker mounting base but same teeth width and size as the stock 81t spur which eliminates the problem of the soft stock gears flexing and stripping out under high load race conditions. Includes mounting hardware and instruction sheet- but bolts right on to the stock gear diff. Not for the slipper set.

Fits Xray, AE, Yokomo center diffs