i‘ve seen reviews about the v6, the gt, and the gt500 and they said that the mustangs rear axle is not the best and needs some improvement
Mustangs (with the exception of some SVT Cobras) have always had a solid rear axle. The modern retro muscle cars (Camaro, Challenger, etc) have a version of an independent rear suspension. The difference is in the handling, the IRS may allow better cornering. The solid rear axle is tougher and will handle more horsepower, all other things being equal. You see a lot of road cars with IRS, but a straight line drag car always has a solid axle. Depends a lot on cost, personal preference and intended use. The average driver probably wouldn't even know the difference.
