Lurching problem and I'm out of ideas.

Dartswinger70 said

whining is more of a pinion depth/backlash ajustment etc. OR possible bearings. The actual friction /cone unit Im not so sure.i have the cone unit and its pretty durable IMO. I also have clutches in my Ford 8.8 Fox Body,and they can be "noisy" LOL!

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I haven't experienced any issues with tight turns at that low speed. Only noticed it when coasting down from a higher speed than I would likely do in a parking lot. That said, I'll do that neutral test today and also try in a parking lot... Maybe I just haven't noticed it.

I haven't paid too much attention to the whine because I figured it's a separate issue. It's just that they rebuilt it twice and it still whined, so I thought that was maybe telling...