THE ALL NEW FIVESTAR ALUMINUM LAYDOWN TRANSMISSION CASE. 2.60 GEAR RATIO USING TEAM ASSOCIATED 52 TOOTH DIFF. CASE ONLY. USES B6.1 TOPSHAFT, FIVESTAR HOBBIES 41 TOOTH ALUMINUM IDLER GEAR AND TEAM ASSOCIATED 52 TOOTH DIFF ASSY. THIS IS THE TRANS CASE ONLY.