Also if you plan on changing the gears to a different ratio, there are carrier breaks. A Dana 44 uses 2 different carriers; one for 3.73 and high gears, and one for 3.92 gears and lower. The GM 12 Bolt has 3; one for gears 2.54 -2.73, one for gears 2.76-3.42, ... Login to read more.