Dana 30 Front Axle Wrangler JK and JL 4.10-5.38 Ratio Ring and PinionRestore Factory Performance to Your Sport or Sahara. For owners of Jeep Wrangler Sport and Sahara models, adding larger tires often exposes the limitations of the factory gear ratio. The result is a Jeep that feels underpowered on the highway and struggles to climb obstacles on the trail. Revolution Gear & Axle offers a premium solution to wake your engine back up without requiring a complete axle swap. At Overland Truck Store, we trust Revolution