THE ALL NEW FIVESTAR DELRIN LAYDOWN TRANSMISSION KIT 2.60 GEAR RATIO USING TEAM ASSOCIATED 52 TOOTH DIFF. COMES WITH TRANS CASE, B6.1 TOPSHAFT, FIVESTAR HOBBIES 41 TOOTH ALUMINUM IDLER GEAR, EXOTEK ALUMINUM DIFF CASE, INTERNAL DIFF PARTS,OUTDRIVES, IDLER SHAFT, DIFF HEIGHT INSERTS AND BEARINGS. TRANSMISSION WILL COME UNASSEMBLED