Thanks for your suggestions. Also thanks to Gary. I am able to smoothly go through the gears with the engine off. I think that validates the detents being ok. I drove it again today and it will not go from 4th to 3rd. If I slow down to 15 mph and double clutch, it slips in. I replaced bearings and syncros when I had it apart. You mentioned hub springs and keys, but would it still shift into 3rd and from 3rd to 4th if that was the issue. I guess there is something that will not let it slide one way at high speed from the 4th to 3rd (front to back) direction. I will probably pull it apart in the near future because it is only an annoyance at the present, but it would be nice to have an idea of what needs to be changed to fix it. Could I have reversed the hub?