I've been dealing with this frustrating issue on my 2019 Mustang GT for a few months now and honestly I'm running out of ideas and patience, because every time I hit a bump or an uneven patch of road, especially on those concrete sections of Sheikh Zayed Road with the expansion joints, the rear end feels like it's hopping sideways almost like the axle is trying to dance its own little jig back there. It's not a subtle feeling either, it's actually quite pronounced and it makes the car feel really unsettled, which is not what you want in a 450 horsepower rear-wheel drive car when you're just trying to cruise along at highway speeds. I've had the shocks and struts replaced with Bilsteins thinking that would sort it out, and I've also fitted new rear lower control arms because I read online that the stock ones can be a weak point, but the hopping is still there and it's honestly driving me mad. I've had the alignment done at two different shops and both said everything was within spec, so I'm starting to wonder if maybe the issue is something more subtle like the rear subframe bushes or the differential mounting bush that's allowing too much movement under load. A few of the guys in my Mustang club mentioned that these cars can have issues with the IRS setup where the toe links or the camber arms wear out prematurely, causing exactly this kind of unstable feeling over bumps. I really don't want to keep throwing parts at it without a proper diagnosis, so I've been looking for a Genuine Mustang suspension fix in Al Quoz because I've heard that area has a few workshops that specialise in American muscle and actually know the common issues with these cars. Has anyone here experienced a similar rear-end hopping or skipping sensation on their S550, and what was the actual fix that finally sorted it out? Was it the toe links, the camber arms, or something like the wheel bearings or even the differential bushes? I'm really keen to get this sorted because it's spoiling the driving experience and I'm worried it could lead to something more serious like a loss of control if I push the car hard through a corner and the rear end decides to do its own thing.