Feature:30/34/40″ Differential Rear Axle Kits100% brand new.Made of high quality material, super durable to use.The differential allows wheels on the same axle to rotate at different speeds. When your vehicle goes around a corner the wheel on the outside has to travel faster than the wheel on the inside. The differential allows this to happen. Two wheel drive vehicles have one axle and four wheel drive vehicles have two.40″ Differential Rear Axle Drive Shaft kit.Axle Length:30″ inch 760mm34″ inch 860mm40″ inch 1020mmFitment: Suit For Differential Motor Go Kart Golf Cart ATV Quad.17mm 3 Stud Axle Wheel Hub Only17mm bearingsDistance Between Hub Mounting Holes (centre to centre): Approx. 78mm / 3.07inchFitment: for 110cc 125cc quad bike ATV dune buggy go kart with 3 stud wheelFit for 6″ 7″ ATV Go Kart Quad Buggy BigBullTwo Hubs: Left & Right23T 4 Stud Wheel Hub OnlySpline: 23 ToothDiameter of Centre Hole: Approx. 25mm / 0.98inchDistance Between Hub Mounting Holes (centre to centre): Ap