I don't have a 2000, but I do have a paper Parts Manual for the 2000. Is it possible the Spindle and/or the Spacers are installed backwards? (Spindle maybe not, since the drawing only shows a nut and quantity for one end.)
The drawing (Sect. 14-10) shows the Speedo side components, and the order (from Hub-to-Speedo) is as follows: #7 stepped Spacer > #9 Felt Washer > #10 Front Hub Retainer > #11 Speedo Drive Collar.
Both sides have a #7 Stepped Spacer. Each spacer is stepped two ways - one side is recessed, the other protruding.
In both cases the #7 Stepped Spacer should have the protruding side facing in toward the hub bearing. If facing the wrong direction, that may account for the lack of exposed thread and failure of the Speedo drive to engage.
Additionally, does the Speedo Drive Collar have different diameters for each side? If so, maybe reversing the collar will be all that's necessary to get the Drive tabs to engage.
Again, I can only guess based on your information and the drawing from the Parts manual, so I hope this helps.
Good luck!