Traxxas 7780-RED Housing Differential Front/Rear Alu Red X-Maxx, XRTTraxxas 8217 TRX 4 Bearing Kit Restore your TRX 4 to peak performance with this bearing kit. The bearing kit swaps out the standard bearings with new factory fresh replacements. Individual compartments keep everything organized in the box with a handy label to measure and identify the parts. TRX 4 BEARING KIT FEATURES All inclusive bearing kit Individual box compartments Handy label for identifying parts