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Nitro Gear and Axle Trac-Lock limited slip. Dana 60, 35 spline axle, 4.56 and up "4-series." C-clip compatible for the semi-float, 35 spline axle E250 and E350 Vans. All steel clutches. Works with any Dana 60 with 35 spline axles and a standard 4.56 and up gear ratio. PLEASE MAKE SURE YOU HAVE A STANDARD 4.56 AND UP GEAR AND NOT A "THICK" GEAR. All units have been inspected and confirmed to be 4-series carriers. Will not work with 4.30 and down ratios, or aftermarket "thick" gears, as both require a 4.10 and down "3-series" carrier. Product is new but not in a fancy Nitro box.
For reference, the last picture shows the difference between a 3-series carrier on the right, and the 4-series Nitro Trac-Lock on the left. A 3-series carrier will measure around 1.225+/- inches from the bearing seat to the deck where the ring gear mounts. a 4-series carrier will measure 0.2 inches more, so around 1.425+/- from the bearing seat to the deck.
