WK Grand Cherokee IRS
The 2011 and newer model Jeep Grand Cherokee (WK) comes with IRS in several flavors, depending on engine and drivetrain configuration. They use an 8.9-inch ring gear in either aluminum or cast iron housing. Designators are: 195RIA (rear independent aluminum), 215RII (rear independent iron), 225RII (rear independent iron), and 230RIA (rear independent aluminum; with or without ELSD)
Ford Dana 50 TTB
The Ford Dana 50 Twin Traction Beam (TTB) was used in 4WDs from 1980 to 1998 in F-250 models and from 1980 to 1986 in F-350 models. The 9-inch ring gear is held to the differential using 10 bolts. Axle spline count is 30 and a single carrier is designed to accommodate all axle ratios. This IFS style housing is of cast iron construction.
Toyota 8-Inch IFS
The Toyota 8-inch IFS is found in 2003-and-newer 4Runner, 2004-and-newer T-100 and Tacoma, and FJ Cruiser models. The differential accepts 30-spline axleshafts and there are 10 ring gear bolts. One carrier style is used for 3.91 and up ratios and another carrier is used for 3.73 and down ratios.
Ford Expedition Rear IRS
Ford used cast-iron Independent Rear Suspension (IRS) units in 2002-to-2010 Expeditions, Explorers, Lincoln Mountaineers and Navigators. These have an 8.8-inch ring gear held in place with 10 bolts. Spline count is 31.
The Currie F9 9-inch independent centersection is an example of an aftermarket housing offering with axles for use with Series 30 CVs. It’s suitable for buggy and race car applications and can be used in the front or rear. The housings are setup with third-member studs, fill cap, drain plug, and vent. The 300M axles accept Series 30 CVs, and include the bearings and retaining hardware. The housings can also accept 10-inch ring gears with some minor trimming of the third-member mounting face. Unit width is 14.5 inches from axle face to axle face. F9 images courtesy of Currie Enterprises.