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Message: <blockquote data-quote="ReplicaR" data-source="post: 779696" data-attributes="member: 9209">I'm sure that there are quite a few racers who will disagree with you on that one. There are tons of cars out there, which are fast as hell, have tons of rear traction, and are running a 3 link. When the tracks are smooth enough, which most of them are, solid axle hooks up really well. There are some things that I'm not big on, after the torque arm install, but most of those come from daily driver perspective.There are some really good advantages to having IRS, such as fixed differential location. This means that pinion angle will stay the same no matter what, unlike torque arm for example, and no matter how much you lower it, you will never rub drive shaft on the e-brake bracket.My thought is that converting car from one setup to another is kinda pointless, because they work about the same on the road course. If your car came with IRS, then you can keep it and make it work. But if you have solid axle, it will be cheaper for you to make that work, especially seeing how well a good 3 link setup will work on the track. To swap IRS into Mustang, then get all the mods on there to make it run right, will cost probably twice as much as a good 3 link setup with centering device.</blockquote>