This is the replacement Differential Assembly for the Customworks RC GBX electric series. FEATURES: Complete ball differential in a convenient package Replaces worn or damaged ball differentials INCLUDES: One composite diff gear - CSWC4356 Two 5/32x5/16 bearings 12 carbide diff balls - CSWC4357 Six thrust balls - CSWC4359 One left side diff hub - CSWC4364 One right side diff hub - CSWC4365 One diff spring - CSWC4362 One white nylon t-nut - CSWC4361 One 2-56 thrust bolt - CSWC4361 One white nylon thrust bolt washer - CSWC4361 Two thrust washers - CSWC4360 Two diff rings - CSWC4358 One container of diff grease REQUIRES: Assembly and installation following the model manual One 5/64" hex wrench - GPMR8001 kpm11/09/2006 ir/jxs