Traxxas TRX-4 Axle shaft, front (left)/ drive pin/ cross pinReplacement part for these models:TRX-4 1979 Chevrolet BlazerTRX-4 Ford BroncoTRX-4 Scale and Trail CrawlerTRX-4 SportTRX-4 Tactical UnitTRX-4 Unassembled Kit