This Dana 35 Loaded Carrier contains everything you need to convert your 1993 and older Dana 35 to the newer style 1.560" spider gears. If you have a 1993 and older Dana 35 this is everything you need to replace your current spider gears. Fits Dana 35 axle with 3.55 gears or numerically higher. This is a factory Dana/ Spicer unit. Not an aftermarket case. Commonly referred to as a 4 series carrier.