Dynatrac Pro60 IRS Differential, Axles and Hub Kit. Price depends on your Selection of Gear Ratio and Type of Suregrip, (Air Locker, Detroit Locker, True Trac to name a few), or a Spool.Features:-Nodular Iron housing, Powder-Coated Black, for maximum rigidity. Based on the renowned high strength of Dana 60 Gears and Differentials. Heavy Duty Finned Aluminum, Powder-Coated Grey, Differential Cover. Utilizes standard 9-3/4? Dana 60 Gear sets in Ratios from 3.54-7.17 and all available Suregrip Types. Billet 1350 U-bolt style Driveshaft Yoke. 35 Spline Chromoly inner Stub Axles. High Strength CVs with Chromoly Shafts. 35 splines outer axles shafts with high strength 35 Spline Hub Bearings. 1 year Limited Warranty. Made in the USA.Benefits:-Got big Power and High Torque? No problem! Dana 60 conforms with Chrysler muscle car heritage. Choice of differentials to suit YOUR use. Nodular iron housing eliminates housing, differential and gear-life problems under severe use. 35 spline axle shafts replace much weaker, common failure points. Perfect bolt-in fit in all 2008 SRT Challengers and all 2009-2014 Challengers, Chargers and Chrysler 300’s. All other Models may require Modification of the Nose Bolt on the K-Frame. Harder launches with no worry about broken Rear Ends! Build it yourself option allows you to tap into the HUGE aftermarket Dana 60 support and find the parts that are right for you and your budget.NOTE:- On 2012 Vehicles with Auto Trans, altering Gear Ratio from stock, will cause Vehicle to go into Limp Mode.