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About these parts
Ford Racing M210 front drive units are available in 4.46, 4.70, 5.13 and 5.38 ratios, several with an electronic locking differential (ELD). M220 rear axle assemblies come in 4.46 and 4.70 with ELD.
Regearing is what recovers the drivability lost when you fit larger tires — going to 35s or 37s on factory gearing leaves the EcoBoost hunting for ratios and working harder than it should. Front and rear ratios must match, so plan both ends together, and match the ratio to your final tire diameter rather than picking the numerically highest option.
