[WSSix]

I'm still fighting a vibration issue with my car. I've slowly been testing areas and making adjustments. Here's where I'm at now. I have new wheel adapters that center on what little bit of a hub I have. They fit great. They helped the vibrations but didn't eliminate them. The wheels and tires have been balanced using a road force machine. They were out and that helped again. Again, however, it didn't eliminate the vibrations. I had the driveshaft balance checked. It's good. While I had the car at the driveshaft shop, the tech noticed the passenger side rear wheel vibrated/wobbled/bounced around. So I've currently been concentrating my efforts there.

I've had the rear of the car up and have been checking that right rear axle. It's not the wheels as I can swap wheels side to side and the wobble is the same regardless of the wheel. I bought a dial indicator and am getting about 0.035" wobble on the outer rim lip. I've been able to trace this back to the axle flange itself. I've identified high and low, or in and out, using that same dial indicator. The difference is about 0.006". Can this be the issue? I can remove the wheel from the car and drive it up to about 30-35mph while on jack stands and there's no vibrations in the car like there is when the wheel is on. I can also see the rotor wobble as it rotates and it pushes the caliper in and out as well. There's definitely an issue with the flange and not the wheel balance that's vibrating the car. So it feels like this is the issue. But I don't feel any vibrations while driving the car until 60mph. I would think if it's the wheels I would feel something always. I wonder though if the shocks are able to control the vibrations until 60mph since it's not a serious wobble. Think that's plausible? I'm going to adjust them tomorrow and see if I can get the vibrations to change when they come in or something.

The concern I have is if this is the flange, how in the world did this happen? These axles are brand new, custom units from Moser with a few hundred miles at most on them. There's no way their tolerances are that lax. That's terribly out of round for a brand new machined part. The high and the low points on the axle flange are not 180* apart. It's more like 150*-160* at most. I've been fighting this issue since the rear end went into the car. I haven't hit a curb or anything. I just didn't expect it to be axle related since I was doing other work at the same time and these axles fit just fine without fighting them. I'm just not sure what's going on any more with this vibration issue. It's driving me bonkers.

Thanks