Team Associated ASC31863 Apex 2 Diff Spools

The Team Associated ASC31863 Apex 2 Diff Spools are the differential case components that carry the internal gears and transfer power out to the drive axles. Because the spool takes the full torque load of the drivetrain every time you pull the trigger, worn or damaged spools show up as slop in the driveline, inconsistent power delivery, and diff fluid that will not stay where it belongs.

This is a direct replacement for the factory units, so it assembles with your existing internal gears, shims, and seals and drops straight back into the stock gearbox housings with no modification. Fitment covers the Apex2, Apex2 Sport, Apex2 Sport A550, Apex2 Sport ST550, Apex2 Sport Nissan Z, and Apex2 Hoonigan.

Rebuilding with fresh spools restores a tight, sealed differential and predictable corner exit traction. Whether you are servicing a well-used car or building a second diff with a different fluid weight for changing track conditions, this is the core part to start with.