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The Ultimate Dana 60 Semi-Float Axle is a direct-fit replacement for the stock rear axle on all JL Jeep Wrangler vehicles. It's engineered for superior strength inside and out, with heavy-duty upgrades including Spicer ring and pinion gears, a nodular iron diff cover, heavy-duty brackets, and more. The Ultimate Dana 60 semi-float axle offers optimum weight capability while also being capable of handling a wide range of suspension setups and wheel and tire combinations.The Dana/Spicer Model 60 rear axle was used in 3/4 ton Dodge trucks from 1961 and earlier, and high performance Chrysler Hemi passenger cars beginning in 1966. The axle is easily distinguished from other rear axles in these applications by its large size, straight (non-tapered) axle tubes, and the 10 bolt asymmetrical differential cover.This rear axle was designed to withstand the rigors of heavy off-road use and was built for performance-bred Chrysler cars and trucks that featured big brakes, powerful engines, and high horsepower ratings. It features a 9-3/4 inch ring gear, and is capable of handling a wide variety of axle ratios. The rear axle housing is a semi-float design and includes a large number of internal oil passages to maintain proper oil pressure and reduce wear under severe conditions.Using the right sized ring and pinion gears is important to maintaining good differential performance. The ring and pinion gears are mounted to the axle carrier through a large set of retaining rings that keep them secure. The ring and pinion gears can be sized to your specific application by a reputable aftermarket manufacturer. https://dana69.live/ You can upgrade your Dana 60 to increase its ability to handle more power and torque with a variety of positraction and limited slip differentials. These can be added to your vehicle by a professional ring and pinion gear installer, who will also install a stronger positraction carrier bearing and stronger axles.A Dana 60 can be upgraded to handle a higher amount of power and torque than the original factory assembly due to its large differential capacity, high axle spline count, and nodular iron differential cover. However, the addition of these components comes with a significant weight penalty that should be considered before making the upgrade.If you're not sure if your Dana 60 is a full float or semi-float, there's a simple trick that will help you determine which type of axle your car has. You can check by looking at the drum backing plate and counting how many bolts hold it on. If there are 7 bolts, you have a Dana 60 from GMC/Chevy or Jeep, and if there are 4 bolts, then it's a Dodge Dana 60. Depending on how you want to use the axle, these differences could be very significant. If you have a full float Dana 60, it's important to upgrade the axle shafts to 33 or 35 splines to accommodate a larger gear and prevent premature failure. This is a common cause of splining and cracking on Dana 60 axles.