Hot Racing steel helical spiral 37T/13T gear set for Arrma 1/10 4WDThe 37T/13T gear set is the stock gear ratio. FEATURES: - Precision machined helical spiral cut gears offer inherently greater strength and smooth operation than the factory bevel gears. (it has been updated to 15g lighter)- High carbon steel construction- Stronger than the stock bevel Plastic gears- Maintains the stock 37T/13T ratioYOU WILL RECEIVE: - One (1) 37 tooth diff spiral cut ring gear- One (1) 13 tooth spiral cut pinion gearREQUIREMENTS: - ARAC4023 Composite Diff case Cover Or ATF11A01 Aluminum Diff case Cover. - Installation following kit manual- Medium threadlock (blue threadlocking compound) if screws are threaded into metal- Hot Racing SPL10G05 high temp grease recommended for the diff gear. - Use Silicone Diff Fluid for Gear Diffs inside. SPECIFICATIONS: - Weight: 2.35oz (66.75g)COMMENTS: - Replaces bevel-Plastic gears AR310873. AR310872.- ARAC4023 you will only use the differ cover plate do not need to use the back plate. -WILL NOT FIT THE V3