The Exotek Associated B6.2/B6.3 Aluminum Differential Gear Case is a heavy duty machined 7075 alloy differential case for the Team Associated B6.2 or B6.3 and is great option for high powered drag racing applications. Precision machining offers a perfect roundness that creates a free spinning transmission. This is much stronger than the stock plastic differential gear but not indestructible so it is important to use black or white grease on the gears and reapply frequently to prolong its life. Package includes one differential case and one differential cover.