Dana 30 differential case Empty open differential case Dana 30 for Jeep Wrangler TJ with ratio 3.73 and higher.This differential carrier case is made for the Jeep Wrangler TJ with Dana 30 axle (181 MM) but can also be installed on Jeep CJ, YJ, XJ, ZJ and WJ.The article consists only of the empty differential case without internal components.Generally those who want to shorten the ratio of the bevel gears starting from 3.07 and 3.21, need to change the differential case due to the different flange heights.Specifications: manufacturer: Dana Spicer Drivetrain Products type of component: differential supports type of differential case design: Dana 30 type of aftermarket support: open differential cover bolts: 10 axle shaft spline quantity: 27 material of the support: steel fits transmission ratios 3.73 and higher.