Specifications:Machined Aluminum caseHardened Steel Gears, Titanium output shafts, forward motor mounting, and 48 pitch gearsEasy to set gear mesh with a cover to help keep the elements outPinion size 11t-20t 48pTrans ratio 6.75:1-12.27:1FDR straight axle 25.31:1-46.02:1FDR Axial portal axles 48.52:1-88.21:1FDR Vanquish F10 portal axles 35.44:1-64.43:1Recommended: 11t pinion for straight axles, and 14t pinion for portal axles. May vary based on rig.