I have been having a horrible wobble in my steering between 50 and 60mph since changing from the stock wheels. Finally got it figured out. I knew all along it was something with the wheels as it was fine with the stockers.

Even though my wheels are hubcentric wheels, they were not mounting on center. Did a bit of messing around with them to get them centered right and my wobble is gone.

I have found quite a few posts about this problem, so hopefully this will help someone else.

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81 300SD daily driver/project
86 420SEL (sold)
85 380SE(in the graveyard)