Since i've got my transmission back togather and in i havent been able to get it to shift into OD, i'm about 40 miles in and dailying it. It assembled fine and seemed to shift smooth when apart and freewheels fine. No change with the overdrive cable engaged or disengaged. It was assembled with 80-90w brad penn gl4(i now read 40w is recommended by BW?)  Now not overdrive shifting at speed(when letting off the gas) should be purely a mechanical issue right?