These gears come in 4.88, 5.13 and 5.38 ratios for the Dana 44 front and rear differentials and 4.88 and 5.13 for the Dana 30 front. The Dana 44 ring gears have been double drilled to fit both carriers. West Coast Differentials tested the prototypes and they installed with good patterns using the factory shims. Call 800-359-4737 to purchase your gears or to find a supplier or installer near you.